GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-119.el7
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /opt/couchbase/bin/memcached...Reading symbols from /usr/lib/debug/opt/couchbase/bin/memcached-7.1.0-14101.x86_64.debug...done.
done.
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[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `/opt/couchbase/bin/memcached'.
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
238	62:	movq	%rax, %r14
warning: File "/opt/couchbase/lib/libstdc++.so.6.0.28-gdb.py" auto-loading has been declined by your `auto-load safe-path' set to "$debugdir:$datadir/auto-load:/usr/bin/mono-gdb.py".
To enable execution of this file add
	add-auto-load-safe-path /opt/couchbase/lib/libstdc++.so.6.0.28-gdb.py
line to your configuration file "/root/.gdbinit".
To completely disable this security protection add
	set auto-load safe-path /
line to your configuration file "/root/.gdbinit".
For more information about this security protection see the
"Auto-loading safe path" section in the GDB manual.  E.g., run from the shell:
	info "(gdb)Auto-loading safe path"

Thread 38 (Thread 0x7fe2474b8f40 (LWP 84386)):
#0  0x00007fe2437c6eb3 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fe24515a3c5 in epoll_dispatch (base=0x7fe241ec2300, tv=<optimized out>) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/epoll.c:465
        epollop = 0x7fe241f19f60
        events = 0x7fe24301f500
        i = <optimized out>
        res = <optimized out>
        timeout = <optimized out>
        __func__ = "epoll_dispatch"
#2  0x00007fe245151376 in event_base_loop (base=0x7fe241ec2300, flags=1) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/event.c:1998
        evsel = 0x7fe245364c20 <epollops>
        tv = {
          tv_sec = 0, 
          tv_usec = 484993
        }
        tv_p = <optimized out>
        res = <optimized out>
        done = 0
        retval = 0
        __func__ = "event_base_loop"
#3  0x0000000000c186f7 in folly::EventBase::loopBody (this=this@entry=0x7fe243049780, flags=flags@entry=0, ignoreKeepAlive=ignoreKeepAlive@entry=false)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:397
        callbacks = {
          <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
            static constant_time_size = false, 
            static stateful_value_traits = <optimized out>, 
            static has_container_from_iterator = <optimized out>, 
            static safemode_or_autounlink = true, 
            data_ = {
              <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                static link_mode = boost::intrusive::auto_unlink
              }, 
              members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
              root_plus_size_ = {
                <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                  static constant_time_size = <optimized out>
                }, 
                members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                m_header = {
                  <boost::intrusive::list_node<void*>> = {
                    next_ = 0x7ffe83cb9fe0, 
                    prev_ = 0x7ffe83cb9fe0
                  }, <No data fields>}
              }
            }
          }, <No data fields>}
        message = 0xce1548 "Your code just tried to loop over an event base from inside another event base loop. Since libevent is not reentrant, this leads to undefined behavior in opt builds. Please fix immediately. For the co"...
        SCOPE_EXIT_STATE13 = {
          <folly::detail::ScopeGuardImplBase> = {
            dismissed_ = false
          }, 
          members of folly::detail::ScopeGuardImpl<folly::EventBase::loopBody(int, bool)::<lambda()>, true>: 
          function_ = {
            __this = 0x7fe243049780
          }
        }
        res = 0
        ranLoopCallbacks = <optimized out>
        blocking = true
        once = false
        prev = {
          __d = {
            __r = 9751039122468931
          }
        }
        idleStart = {
          __d = {
            __r = 9770378913393675
          }
        }
        busy = <optimized out>
        idle = <optimized out>
        prevLoopThread = {
          _M_thread = 0
        }
#4  0x0000000000c18bc6 in folly::EventBase::loop (this=this@entry=0x7fe243049780) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:315
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xce11bb "EventBase", 
                e_ = 0xce11c4 ""
              }
            }
          }
        }
#5  0x0000000000c1a586 in folly::EventBase::loopForever (this=0x7fe243049780) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:538
        ret = <optimized out>
#6  0x000000000056a06b in memcached_main(int, char**) () at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/daemon/memcached.cc:1006
        numa_status = {
          static npos = 18446744073709551615, 
          _M_dataplus = {
            <std::allocator<char>> = {
              <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
            members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
            _M_p = 0x7fe24302edf0 "Set memory allocation policy to 'interleave'"
          }, 
          _M_string_length = 44, 
          {
            _M_local_buf = ",", '\000' <repeats 14 times>, 
            _M_allocated_capacity = 44
          }
        }
        parent_monitor = {
          _M_t = {
            <std::__uniq_ptr_impl<ProcessMonitor, std::default_delete<ProcessMonitor> >> = {
              _M_t = {
                <std::_Tuple_impl<0, ProcessMonitor*, std::default_delete<ProcessMonitor> >> = {
                  <std::_Tuple_impl<1, std::default_delete<ProcessMonitor> >> = {
                    <std::_Head_base<1, std::default_delete<ProcessMonitor>, true>> = {
                      <std::default_delete<ProcessMonitor>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                  <std::_Head_base<0, ProcessMonitor*, false>> = {
                    _M_head_impl = 0x0
                  }, <No data fields>}, <No data fields>}
            }, <No data fields>}
        }
        fineClock = {
          overhead = {
            __r = 845
          }, 
          measurementPeriod = {
            __r = 1
          }
        }
        coarseClock = {
          overhead = {
            __r = 11
          }, 
          measurementPeriod = {
            __r = 1
          }
        }
        phosphor_internal_category_enabled_972 = {
          _M_b = {
            _M_p = 0x7fe2464c269b <phosphor::TraceLog::getInstance()::log_instance+8283>
          }, 
          static is_always_lock_free = <optimized out>
        }
        phosphor_internal_category_enabled_temp_972 = <optimized out>
        phosphor_internal_tpi_972 = {
          category = 0xc5dc9f "memcached", 
          name = 0xcc3fcc "Started", 
          type = phosphor::GlobalInstant, 
          argument_names = {
            _M_elems = {0xcc80c2 "", 0xcc80c2 ""}
          }, 
          argument_types = {
            _M_elems = {phosphor::is_none, phosphor::is_none}
          }
        }
#7  0x00007fe2436ea555 in __libc_start_main (main=0x53f2c0 <main(int, char**)>, argc=3, argv=0x7ffe83cba9c8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe83cba9b8) at ../csu/libc-start.c:266
        result = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {0, 3016376877879321588, 5645582, 140731109583296, 0, 0, -3017036410271898636, -3019430364823624716}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x7fe2472be9b3 <_dl_init+275>, 0x7fe2474d2150}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 1194060211
            }
          }
        }
        not_first_call = <optimized out>
#8  0x0000000000562537 in _start () at /opt/gcc-10.2.0/include/c++/10.2.0/bits/char_traits.h:322
No symbol table info available.

Thread 37 (Thread 0x7fe1db7fe700 (LWP 84660)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x00007fe245392fa2 in background_thread_sleep (tsdn=<optimized out>, interval=<optimized out>, info=<optimized out>) at src/background_thread.c:232
        tv = {
          tv_sec = 1639454114, 
          tv_usec = 384308
        }
        before_sleep = {
          ns = 1639454114384308000
        }
#2  background_work_sleep_once (ind=<optimized out>, info=<optimized out>, tsdn=<optimized out>) at src/background_thread.c:307
        min_interval = <optimized out>
        narenas = <optimized out>
#3  background_work (ind=<optimized out>, tsd=0x7fe1db7ecf30) at src/background_thread.c:497
        info = <optimized out>
#4  background_thread_entry (ind_arg=<optimized out>) at src/background_thread.c:522
        thread_ind = <optimized out>
#5  0x00007fe245e85ea5 in start_thread (arg=0x7fe1db7fe700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe1db7fe700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140608026961664, 3016376877879321588, 0, 8392704, 0, 140608026961664, -3017442311363435532, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#6  0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 36 (Thread 0x7fe1dbfff700 (LWP 84489)):
#0  0x00007fe2437c6eb3 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fe24515a3c5 in epoll_dispatch (base=0x7fe241ec3e00, tv=<optimized out>) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/epoll.c:465
        epollop = 0x7fe2420542a0
        events = 0x7fe243020280
        i = <optimized out>
        res = <optimized out>
        timeout = <optimized out>
        __func__ = "epoll_dispatch"
#2  0x00007fe245151376 in event_base_loop (base=0x7fe241ec3e00, flags=1) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/event.c:1998
        evsel = 0x7fe245364c20 <epollops>
        tv = {
          tv_sec = 1, 
          tv_usec = 23977
        }
        tv_p = <optimized out>
        res = <optimized out>
        done = 0
        retval = 0
        __func__ = "event_base_loop"
#3  0x0000000000c186f7 in folly::EventBase::loopBody (this=this@entry=0x7fe24304a180, flags=flags@entry=0, ignoreKeepAlive=ignoreKeepAlive@entry=false)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:397
        callbacks = {
          <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
            static constant_time_size = false, 
            static stateful_value_traits = <optimized out>, 
            static has_container_from_iterator = <optimized out>, 
            static safemode_or_autounlink = true, 
            data_ = {
              <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                static link_mode = boost::intrusive::auto_unlink
              }, 
              members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
              root_plus_size_ = {
                <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                  static constant_time_size = <optimized out>
                }, 
                members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                m_header = {
                  <boost::intrusive::list_node<void*>> = {
                    next_ = 0x7fe1dbfed550, 
                    prev_ = 0x7fe1dbfed550
                  }, <No data fields>}
              }
            }
          }, <No data fields>}
        message = 0xce1548 "Your code just tried to loop over an event base from inside another event base loop. Since libevent is not reentrant, this leads to undefined behavior in opt builds. Please fix immediately. For the co"...
        SCOPE_EXIT_STATE13 = {
          <folly::detail::ScopeGuardImplBase> = {
            dismissed_ = false
          }, 
          members of folly::detail::ScopeGuardImpl<folly::EventBase::loopBody(int, bool)::<lambda()>, true>: 
          function_ = {
            __this = 0x7fe24304a180
          }
        }
        res = 0
        ranLoopCallbacks = <optimized out>
        blocking = true
        once = false
        prev = {
          __d = {
            __r = 9751039121904595
          }
        }
        idleStart = {
          __d = {
            __r = 9770378914324477
          }
        }
        busy = <optimized out>
        idle = <optimized out>
        prevLoopThread = {
          _M_thread = 0
        }
#4  0x0000000000c18bc6 in folly::EventBase::loop (this=this@entry=0x7fe24304a180) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:315
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xce11bb "EventBase", 
                e_ = 0xce11c4 ""
              }
            }
          }
        }
#5  0x0000000000c1a586 in folly::EventBase::loopForever (this=0x7fe24304a180) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:538
        ret = <optimized out>
#6  0x0000000000c06839 in folly::IOThreadPoolExecutor::threadRun (this=0x7fe243049a00, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/IOThreadPoolExecutor.cpp:195
        ioThread = {
          <std::__shared_ptr<folly::IOThreadPoolExecutor::IOThread, (__gnu_cxx::_Lock_policy)2>> = {
            <std::__shared_ptr_access<folly::IOThreadPoolExecutor::IOThread, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
            members of std::__shared_ptr<folly::IOThreadPoolExecutor::IOThread, (__gnu_cxx::_Lock_policy)2>: 
            _M_ptr = 0x7fe243054930, 
            _M_refcount = {
              _M_pi = 0x7fe243054920
            }
          }, <No data fields>}
        idler = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::MemoryIdlerTimeout*, std::default_delete<folly::MemoryIdlerTimeout> >> = {
                <std::_Tuple_impl<1, std::default_delete<folly::MemoryIdlerTimeout> >> = {
                  <std::_Head_base<1, std::default_delete<folly::MemoryIdlerTimeout>, true>> = {
                    <std::default_delete<folly::MemoryIdlerTimeout>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::MemoryIdlerTimeout*, false>> = {
                  _M_head_impl = 0x7fe241ebd280
                }, <No data fields>}, <No data fields>}
          }
        }
        guard = <optimized out>
#7  0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#8  __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#9  __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#10 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#11 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#12 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#13 0x00007fe245e85ea5 in start_thread (arg=0x7fe1dbfff700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe1dbfff700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140608035354368, 3016376877879321588, 0, 8392704, 0, 140608035354368, -3017441212388678668, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#14 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 35 (Thread 0x7fe1f8ff9700 (LWP 84488)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=4177425176, absSteadyTime=absSteadyTime@entry=0x7fe1f8fe72f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd85b8)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770384, 
          tv_nsec = 181059032
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd85b8, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe1f8fe7318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd85b8) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd85b8, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770384181059032
          }
        }
#5  0x0000000000bfeb57 in futexWaitPreIdle<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > >, std::chrono::duration<long, std::ratio<1, 1000000000> > > (
    timeoutVariationFrac=0.5, stackToRetain=1024, idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=..., _ret=<synthetic pointer>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:194
        rv = <optimized out>
        idleDeadline = {
          __d = {
            __r = 9770384181059032
          }
        }
#6  futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, idleTimeout=..., 
    waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:151
No locals.
#7  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd85b8, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#8  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#9  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x14457c0, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd85b8
                }, <No data fields>}, <No data fields>}
          }
        }
#10 0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x14457c0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#11 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1445780, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#12 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f65c00, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = -64 '\300', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x7fe2283f21c0, 
                      tiny = {
                        __data = "\300!?(\342\177\000\000\000\000\000\000\000\000\000\000\020I\002C\342\177\000\000\bJ\001\000\000\000\000\000X\000\000\000\000\000\000\000\020v\376\370\341\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0xabac70 <folly::detail::function::FunctionTraits<void ()>::callSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}>(folly::detail::function::Data&)>, 
                    exec_ = 0xab93c0 <folly::detail::function::execSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}>(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data)>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 9770377916958039
                    }
                  }, 
                  expiration_ = {
                    __r = 0
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x14a08, 
                      tiny = {
                        __data = "\bJ\001\000\000\000\000\000;\235\244", '\000' <repeats 13 times>, "_n+F\342\177\000\000\240v\376\370\341\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x4664dd <folly::detail::function::FunctionTraits<void ()>::uninitCall(folly::detail::function::Data&)>, 
                    exec_ = 0x0
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0x0, 
                      _M_refcount = {
                        _M_pi = 0x0
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = false, 
                priority_ = 0 '\000', 
                queueObserverPayload_ = 0
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#13 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#14 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#15 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#16 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#17 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#18 0x0000000000aba244 in operator() (this=0x7fe241e95080) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe241e95080: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3d50, 
            tiny = {
              __data = "P=\353A\342\177\000\000gmentation_threshold\000own\260P\351A\342\177\000\000\000\000\000\000\000\000\000", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 operator() (__closure=0x7fe241e95080) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe1f8fe76a0 "NonIoPool1"
                }, 
                _M_string_length = 10, 
                {
                  _M_local_buf = "NonIoPool1\000\000\000\000\000", 
                  _M_allocated_capacity = 8029725099528449870
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3d50, 
            tiny = {
              __data = "P=\353A\342\177\000\000gmentation_threshold\000own\260P\351A\342\177\000\000\000\000\000\000\000\000\000", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#20 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe241e95080: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb3d50, 
              tiny = {
                __data = "P=\353A\342\177\000\000gmentation_threshold\000own\260P\351A\342\177\000\000\000\000\000\000\000\000\000", 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#21 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#22 0x00007fe245e85ea5 in start_thread (arg=0x7fe1f8ff9700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe1f8ff9700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140608521869056, 3016376877879321588, 0, 8392704, 0, 140608521869056, -3017513776934886412, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#23 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 34 (Thread 0x7fe1f97fa700 (LWP 84487)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=4185817880, absSteadyTime=absSteadyTime@entry=0x7fe1f97e82f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd85a0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770384, 
          tv_nsec = 848517685
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd85a0, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe1f97e8318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd85a0) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd85a0, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770384848517685
          }
        }
#5  0x0000000000bfeb57 in futexWaitPreIdle<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > >, std::chrono::duration<long, std::ratio<1, 1000000000> > > (
    timeoutVariationFrac=0.5, stackToRetain=1024, idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=..., _ret=<synthetic pointer>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:194
        rv = <optimized out>
        idleDeadline = {
          __d = {
            __r = 9770384848517685
          }
        }
#6  futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, idleTimeout=..., 
    waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:151
No locals.
#7  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd85a0, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#8  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#9  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x14457c0, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd85a0
                }, <No data fields>}, <No data fields>}
          }
        }
#10 0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x14457c0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#11 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1445780, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#12 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f65c00, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = 0 '\000', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x0, 
                      tiny = {
                        __data = '\000' <repeats 16 times>, "\020I\002C\342\177\000\000\aJ\001\000\000\000\000\000P\000\000\000\000\000\000\000\020\206~\371\341\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0xabb4d0 <folly::detail::function::FunctionTraits<void ()>::callSmall<FollyExecutorPool::TaskProxy::resetTaskPtrViaCpuPool(std::atomic<int>&)::{lambda()#2}>(folly::detail::function::Data&)>, 
                    exec_ = 0xaba0c0 <folly::detail::function::execSmall<FollyExecutorPool::TaskProxy::resetTaskPtrViaCpuPool(std::atomic<int>&)::{lambda()#2}>(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data)>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 9770378914319553
                    }
                  }, 
                  expiration_ = {
                    __r = 0
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x14a07, 
                      tiny = {
                        __data = "\aJ\001\000\000\000\000\000;\235\244", '\000' <repeats 13 times>, "_n+F\342\177\000\000\240\206~\371\341\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x4664dd <folly::detail::function::FunctionTraits<void ()>::uninitCall(folly::detail::function::Data&)>, 
                    exec_ = 0x0
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0x0, 
                      _M_refcount = {
                        _M_pi = 0x0
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = false, 
                priority_ = 0 '\000', 
                queueObserverPayload_ = 140609800669017
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#13 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#14 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#15 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#16 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#17 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#18 0x0000000000aba244 in operator() (this=0x7fe241e95040) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe241e95040: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3de0, 
            tiny = {
              __data = "\340=\353A\342\177\000\000_db_and_view_compaction\000pP\351A\342\177\000\000\000\000\000\000\000\000\000", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 operator() (__closure=0x7fe241e95040) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe1f97e86a0 "NonIoPool0"
                }, 
                _M_string_length = 10, 
                {
                  _M_local_buf = "NonIoPool0\000\000\000\000\000", 
                  _M_allocated_capacity = 8029725099528449870
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3de0, 
            tiny = {
              __data = "\340=\353A\342\177\000\000_db_and_view_compaction\000pP\351A\342\177\000\000\000\000\000\000\000\000\000", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#20 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe241e95040: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb3de0, 
              tiny = {
                __data = "\340=\353A\342\177\000\000_db_and_view_compaction\000pP\351A\342\177\000\000\000\000\000\000\000\000\000", 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#21 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#22 0x00007fe245e85ea5 in start_thread (arg=0x7fe1f97fa700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe1f97fa700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140608530261760, 3016376877879321588, 0, 8392704, 0, 140608530261760, -3017517076006640652, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#23 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 33 (Thread 0x7fe1f9ffb700 (LWP 84486)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=4194210584, absSteadyTime=absSteadyTime@entry=0x7fe1f9fe92f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd8198)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770419, 
          tv_nsec = 168964701
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd8198, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe1f9fe9318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd8198) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd8198, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770419168964701
          }
        }
#5  0x0000000000bfea1d in futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, 
    idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:164
No locals.
#6  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd8198, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#7  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#8  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x1445240, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd8198
                }, <No data fields>}, <No data fields>}
          }
        }
#9  0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x1445240)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#10 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1445200, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#11 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f65000, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = 0 '\000', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x0, 
                      tiny = {
                        __data = "\000\000\000\000\000\000\000\000\320'LF\342\177\000\000\060\000\000\000\000\000\000\000\006J\001\000\000\000\000\000H\000\000\000\000\000\000\000\020\226\376\371\341\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x7fe1f9fe96a0, 
                    exec_ = 0x5bf88f <cb_malloc(size_t)+15>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 0
                    }
                  }, 
                  expiration_ = {
                    __r = 84486
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x14a06, 
                      tiny = {
                        __data = "\006J\001\000\000\000\000\000;\235\244", '\000' <repeats 13 times>, "_n+F\342\177\000\000\240\226\376\371\341\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x14a06, 
                    exec_ = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0xa, 
                      _M_refcount = {
                        _M_pi = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = 160, 
                priority_ = -106 '\226', 
                queueObserverPayload_ = 140609816586564
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#12 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#13 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#14 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#15 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#16 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#17 0x0000000000aba244 in operator() (this=0x7fe241e81f40) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe241e81f40: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3e10, 
            tiny = {
              __data = "\020>\353A\342\177\000\000%\000\000\000\000\000\000\000%\000\000\000\000\000\000\000p:\350A\342\177\000\000\240:\350A\342\177\000\000%\000\000\000\000\000\000", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#18 operator() (__closure=0x7fe241e81f40) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe1f9fe96a0 "AuxIoPool0"
                }, 
                _M_string_length = 10, 
                {
                  _M_local_buf = "AuxIoPool0\000\000\000\000\000", 
                  _M_allocated_capacity = 8029725099529106753
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3e10, 
            tiny = {
              __data = "\020>\353A\342\177\000\000%\000\000\000\000\000\000\000%\000\000\000\000\000\000\000p:\350A\342\177\000\000\240:\350A\342\177\000\000%\000\000\000\000\000\000", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe241e81f40: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb3e10, 
              tiny = {
                __data = "\020>\353A\342\177\000\000%\000\000\000\000\000\000\000%\000\000\000\000\000\000\000p:\350A\342\177\000\000\240:\350A\342\177\000\000%\000\000\000\000\000\000", 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#20 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#21 0x00007fe245e85ea5 in start_thread (arg=0x7fe1f9ffb700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe1f9ffb700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140608538654464, 3016376877879321588, 0, 8392704, 0, 140608538654464, -3017515977031883788, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#22 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 32 (Thread 0x7fe1fa7fc700 (LWP 84485)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=4202603288, absSteadyTime=absSteadyTime@entry=0x7fe1fa7ea2f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd8180)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770419, 
          tv_nsec = 168988697
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd8180, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe1fa7ea318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd8180) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd8180, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770419168988697
          }
        }
#5  0x0000000000bfea1d in futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, 
    idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:164
No locals.
#6  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd8180, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#7  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#8  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x1443ac0, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd8180
                }, <No data fields>}, <No data fields>}
          }
        }
#9  0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x1443ac0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#10 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1443a80, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#11 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f05400, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = 0 '\000', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x0, 
                      tiny = {
                        __data = "\000\000\000\000\000\000\000\000\320'LF\342\177\000\000\060\000\000\000\000\000\000\000\005J\001\000\000\000\000\000@\000\000\000\000\000\000\000\020\246~\372\341\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x7fe1fa7ea6a0, 
                    exec_ = 0x5bf88f <cb_malloc(size_t)+15>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 0
                    }
                  }, 
                  expiration_ = {
                    __r = 84485
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x14a05, 
                      tiny = {
                        __data = "\005J\001\000\000\000\000\000;\235\244", '\000' <repeats 13 times>, "_n+F\342\177\000\000\240\246~\372\341\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x14a05, 
                    exec_ = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0x1b, 
                      _M_refcount = {
                        _M_pi = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = 160, 
                priority_ = -90 '\246', 
                queueObserverPayload_ = 140609816586564
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#12 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#13 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#14 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#15 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#16 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#17 0x0000000000aba244 in operator() (this=0x7fe24303ee40) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe24303ee40: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3c00, 
            tiny = {
              __data = "\000<\353A\342\177\000\000y_fields", '\000' <repeats 16 times>, "p\356\003C\342\177\000\000\000\000\000\000\000\000\000", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#18 operator() (__closure=0x7fe24303ee40) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe1fa7ea6a0 "WriterPool7"
                }, 
                _M_string_length = 11, 
                {
                  _M_local_buf = "WriterPool7\000\000\000\000", 
                  _M_allocated_capacity = 8021036716417184343
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3c00, 
            tiny = {
              __data = "\000<\353A\342\177\000\000y_fields", '\000' <repeats 16 times>, "p\356\003C\342\177\000\000\000\000\000\000\000\000\000", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe24303ee40: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb3c00, 
              tiny = {
                __data = "\000<\353A\342\177\000\000y_fields", '\000' <repeats 16 times>, "p\356\003C\342\177\000\000\000\000\000\000\000\000\000", 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#20 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#21 0x00007fe245e85ea5 in start_thread (arg=0x7fe1fa7fc700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe1fa7fc700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140608547047168, 3016376877879321588, 0, 8392704, 0, 140608547047168, -3017510480010615820, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#22 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 31 (Thread 0x7fe1faffd700 (LWP 84484)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=4210995992, absSteadyTime=absSteadyTime@entry=0x7fe1fafeb2f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd8168)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770419, 
          tv_nsec = 159956118
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd8168, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe1fafeb318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd8168) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd8168, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770419159956118
          }
        }
#5  0x0000000000bfea1d in futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, 
    idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:164
No locals.
#6  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd8168, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#7  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#8  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x1443ac0, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd8168
                }, <No data fields>}, <No data fields>}
          }
        }
#9  0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x1443ac0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#10 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1443a80, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#11 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f05400, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = 0 '\000', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x0, 
                      tiny = {
                        __data = "\000\000\000\000\000\000\000\000\320'LF\342\177\000\000\060\000\000\000\000\000\000\000\004J\001\000\000\000\000\000\070\000\000\000\000\000\000\000\020\266\376\372\341\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x7fe1fafeb6a0, 
                    exec_ = 0x5bf88f <cb_malloc(size_t)+15>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 0
                    }
                  }, 
                  expiration_ = {
                    __r = 84484
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x14a04, 
                      tiny = {
                        __data = "\004J\001\000\000\000\000\000;\235\244", '\000' <repeats 13 times>, "_n+F\342\177\000\000\240\266\376\372\341\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x14a04, 
                    exec_ = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0xf, 
                      _M_refcount = {
                        _M_pi = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = 160, 
                priority_ = -74 '\266', 
                queueObserverPayload_ = 140609816586564
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#12 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#13 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#14 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#15 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#16 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#17 0x0000000000aba244 in operator() (this=0x7fe24303ee00) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe24303ee00: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3b40, 
            tiny = {
              __data = "@;\353A\342\177\000\000 \000\000\000\000\000\000\000 ", '\000' <repeats 15 times>, "filtering_permit", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#18 operator() (__closure=0x7fe24303ee00) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe1fafeb6a0 "WriterPool6"
                }, 
                _M_string_length = 11, 
                {
                  _M_local_buf = "WriterPool6\000\000\000\000", 
                  _M_allocated_capacity = 8021036716417184343
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3b40, 
            tiny = {
              __data = "@;\353A\342\177\000\000 \000\000\000\000\000\000\000 ", '\000' <repeats 15 times>, "filtering_permit", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe24303ee00: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb3b40, 
              tiny = {
                __data = "@;\353A\342\177\000\000 \000\000\000\000\000\000\000 ", '\000' <repeats 15 times>, "filtering_permit", 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#20 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#21 0x00007fe245e85ea5 in start_thread (arg=0x7fe1faffd700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe1faffd700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140608555439872, 3016376877879321588, 0, 8392704, 0, 140608555439872, -3017509381035858956, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#22 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 30 (Thread 0x7fe1fb7fe700 (LWP 84483)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=4219388696, absSteadyTime=absSteadyTime@entry=0x7fe1fb7ec2f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd8150)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770419, 
          tv_nsec = 170258698
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd8150, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe1fb7ec318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd8150) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd8150, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770419170258698
          }
        }
#5  0x0000000000bfea1d in futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, 
    idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:164
No locals.
#6  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd8150, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#7  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#8  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x1443ac0, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd8150
                }, <No data fields>}, <No data fields>}
          }
        }
#9  0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x1443ac0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#10 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1443a80, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#11 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f05400, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = 0 '\000', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x0, 
                      tiny = {
                        __data = "\000\000\000\000\000\000\000\000\320'LF\342\177\000\000\060\000\000\000\000\000\000\000\003J\001\000\000\000\000\000\060\000\000\000\000\000\000\000\020\306~\373\341\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x7fe1fb7ec6a0, 
                    exec_ = 0x5bf88f <cb_malloc(size_t)+15>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 0
                    }
                  }, 
                  expiration_ = {
                    __r = 84483
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x14a03, 
                      tiny = {
                        __data = "\003J\001\000\000\000\000\000;\235\244", '\000' <repeats 13 times>, "_n+F\342\177\000\000\240\306~\373\341\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x14a03, 
                    exec_ = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0x3, 
                      _M_refcount = {
                        _M_pi = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = 160, 
                priority_ = -58 '\306', 
                queueObserverPayload_ = 140609816586564
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#12 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#13 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#14 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#15 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#16 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#17 0x0000000000aba244 in operator() (this=0x7fe24303ed40) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe24303ed40: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3c90, 
            tiny = {
              __data = "\220<\353A\342\177", '\000' <repeats 41 times>, 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#18 operator() (__closure=0x7fe24303ed40) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe1fb7ec6a0 "WriterPool5"
                }, 
                _M_string_length = 11, 
                {
                  _M_local_buf = "WriterPool5\000\000\000\000", 
                  _M_allocated_capacity = 8021036716417184343
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3c90, 
            tiny = {
              __data = "\220<\353A\342\177", '\000' <repeats 41 times>, 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe24303ed40: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb3c90, 
              tiny = {
                __data = "\220<\353A\342\177", '\000' <repeats 41 times>, 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#20 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#21 0x00007fe245e85ea5 in start_thread (arg=0x7fe1fb7fe700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe1fb7fe700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140608563832576, 3016376877879321588, 0, 8392704, 0, 140608563832576, -3017512680107613196, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#22 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 29 (Thread 0x7fe1fbfff700 (LWP 84482)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=4227781400, absSteadyTime=absSteadyTime@entry=0x7fe1fbfed2f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd8138)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770419, 
          tv_nsec = 160756147
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd8138, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe1fbfed318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd8138) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd8138, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770419160756147
          }
        }
#5  0x0000000000bfea1d in futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, 
    idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:164
No locals.
#6  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd8138, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#7  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#8  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x1443ac0, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd8138
                }, <No data fields>}, <No data fields>}
          }
        }
#9  0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x1443ac0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#10 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1443a80, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#11 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f05400, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = 0 '\000', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x0, 
                      tiny = {
                        __data = "\000\000\000\000\000\000\000\000\320'LF\342\177\000\000\060\000\000\000\000\000\000\000\002J\001\000\000\000\000\000(\000\000\000\000\000\000\000\020\326\376\373\341\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x7fe1fbfed6a0, 
                    exec_ = 0x5bf88f <cb_malloc(size_t)+15>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 0
                    }
                  }, 
                  expiration_ = {
                    __r = 84482
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x14a02, 
                      tiny = {
                        __data = "\002J\001\000\000\000\000\000;\235\244", '\000' <repeats 13 times>, "_n+F\342\177\000\000\240\326\376\373\341\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x14a02, 
                    exec_ = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0x14, 
                      _M_refcount = {
                        _M_pi = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = 160, 
                priority_ = -42 '\326', 
                queueObserverPayload_ = 140609816586564
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#12 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#13 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#14 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#15 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#16 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#17 0x0000000000aba244 in operator() (this=0x7fe24303edc0) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe24303edc0: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3c30, 
            tiny = {
              __data = "0<\353A\342\177", '\000' <repeats 26 times>, "\360\355\003C\342\177\000\000\016\000\000\000\000\000\000", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#18 operator() (__closure=0x7fe24303edc0) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe1fbfed6a0 "WriterPool4"
                }, 
                _M_string_length = 11, 
                {
                  _M_local_buf = "WriterPool4\000\000\000\000", 
                  _M_allocated_capacity = 8021036716417184343
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3c30, 
            tiny = {
              __data = "0<\353A\342\177", '\000' <repeats 26 times>, "\360\355\003C\342\177\000\000\016\000\000\000\000\000\000", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe24303edc0: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb3c30, 
              tiny = {
                __data = "0<\353A\342\177", '\000' <repeats 26 times>, "\360\355\003C\342\177\000\000\016\000\000\000\000\000\000", 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#20 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#21 0x00007fe245e85ea5 in start_thread (arg=0x7fe1fbfff700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe1fbfff700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140608572225280, 3016376877879321588, 0, 8392704, 0, 140608572225280, -3017511581132856332, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#22 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 28 (Thread 0x7fe228fcf700 (LWP 84481)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=687592216, absSteadyTime=absSteadyTime@entry=0x7fe228fbd2f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd8120)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770419, 
          tv_nsec = 165590119
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd8120, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe228fbd318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd8120) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd8120, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770419165590119
          }
        }
#5  0x0000000000bfea1d in futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, 
    idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:164
No locals.
#6  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd8120, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#7  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#8  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x1443ac0, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd8120
                }, <No data fields>}, <No data fields>}
          }
        }
#9  0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x1443ac0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#10 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1443a80, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#11 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f05400, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = 0 '\000', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x0, 
                      tiny = {
                        __data = "\000\000\000\000\000\000\000\000\320'LF\342\177\000\000\060\000\000\000\000\000\000\000\001J\001\000\000\000\000\000 \000\000\000\000\000\000\000\020\326\373(\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x7fe228fbd6a0, 
                    exec_ = 0x5bf88f <cb_malloc(size_t)+15>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 0
                    }
                  }, 
                  expiration_ = {
                    __r = 84481
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x14a01, 
                      tiny = {
                        __data = "\001J\001\000\000\000\000\000;\235\244", '\000' <repeats 13 times>, "_n+F\342\177\000\000\240\326\373(\342\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x14a01, 
                    exec_ = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0x4, 
                      _M_refcount = {
                        _M_pi = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = 160, 
                priority_ = -42 '\326', 
                queueObserverPayload_ = 140609816586564
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#12 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#13 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#14 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#15 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#16 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#17 0x0000000000aba244 in operator() (this=0x7fe24303ed80) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe24303ed80: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3cf0, 
            tiny = {
              __data = "\360<\353A\342\177", '\000' <repeats 26 times>, "\260\355\003C\342\177\000\000\000\000\000\000\000\000\000", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#18 operator() (__closure=0x7fe24303ed80) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe228fbd6a0 "WriterPool3"
                }, 
                _M_string_length = 11, 
                {
                  _M_local_buf = "WriterPool3\000\000\000\000", 
                  _M_allocated_capacity = 8021036716417184343
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3cf0, 
            tiny = {
              __data = "\360<\353A\342\177", '\000' <repeats 26 times>, "\260\355\003C\342\177\000\000\000\000\000\000\000\000\000", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe24303ed80: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb3cf0, 
              tiny = {
                __data = "\360<\353A\342\177", '\000' <repeats 26 times>, "\260\355\003C\342\177\000\000\000\000\000\000\000\000\000", 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#20 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#21 0x00007fe245e85ea5 in start_thread (arg=0x7fe228fcf700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe228fcf700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609327003392, 3016376877879321588, 0, 8392704, 0, 140609327003392, -3019659983903857676, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#22 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 27 (Thread 0x7fe2297d0700 (LWP 84480)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=695984920, absSteadyTime=absSteadyTime@entry=0x7fe2297be2f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd8108)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770419, 
          tv_nsec = 159963382
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd8108, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe2297be318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd8108) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd8108, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770419159963382
          }
        }
#5  0x0000000000bfea1d in futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, 
    idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:164
No locals.
#6  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd8108, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#7  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#8  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x1443ac0, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd8108
                }, <No data fields>}, <No data fields>}
          }
        }
#9  0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x1443ac0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#10 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1443a80, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#11 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f05400, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = 0 '\000', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x0, 
                      tiny = {
                        __data = "\000\000\000\000\000\000\000\000\320'LF\342\177\000\000\060\000\000\000\000\000\000\000\000J\001\000\000\000\000\000\030\000\000\000\000\000\000\000\020\346{)\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x7fe2297be6a0, 
                    exec_ = 0x5bf88f <cb_malloc(size_t)+15>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 0
                    }
                  }, 
                  expiration_ = {
                    __r = 84480
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x14a00, 
                      tiny = {
                        __data = "\000J\001\000\000\000\000\000;\235\244", '\000' <repeats 13 times>, "_n+F\342\177\000\000\240\346{)\342\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x14a00, 
                    exec_ = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0x15, 
                      _M_refcount = {
                        _M_pi = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = 160, 
                priority_ = -26 '\346', 
                queueObserverPayload_ = 140609816586564
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#12 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#13 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#14 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#15 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#16 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#17 0x0000000000aba244 in operator() (this=0x7fe24303ed00) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe24303ed00: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb30c0, 
            tiny = {
              __data = "\300\060\353A\342\177\000\000y_fields", '\000' <repeats 16 times>, "\060\355\003C\342\177\000\000\000\000\000\000\000\000\000", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#18 operator() (__closure=0x7fe24303ed00) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe2297be6a0 "WriterPool2"
                }, 
                _M_string_length = 11, 
                {
                  _M_local_buf = "WriterPool2\000\000\000\000", 
                  _M_allocated_capacity = 8021036716417184343
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb30c0, 
            tiny = {
              __data = "\300\060\353A\342\177\000\000y_fields", '\000' <repeats 16 times>, "\060\355\003C\342\177\000\000\000\000\000\000\000\000\000", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe24303ed00: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb30c0, 
              tiny = {
                __data = "\300\060\353A\342\177\000\000y_fields", '\000' <repeats 16 times>, "\060\355\003C\342\177\000\000\000\000\000\000\000\000\000", 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#20 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#21 0x00007fe245e85ea5 in start_thread (arg=0x7fe2297d0700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe2297d0700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609335396096, 3016376877879321588, 0, 8392704, 0, 140609335396096, -3019663282975611916, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#22 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 26 (Thread 0x7fe229fd1700 (LWP 84479)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=704377624, absSteadyTime=absSteadyTime@entry=0x7fe229fbf2f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd80f0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770419, 
          tv_nsec = 168977756
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd80f0, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe229fbf318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd80f0) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd80f0, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770419168977756
          }
        }
#5  0x0000000000bfea1d in futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, 
    idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:164
No locals.
#6  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd80f0, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#7  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#8  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x1443ac0, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd80f0
                }, <No data fields>}, <No data fields>}
          }
        }
#9  0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x1443ac0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#10 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1443a80, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#11 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f05400, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = 0 '\000', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x0, 
                      tiny = {
                        __data = "\000\000\000\000\000\000\000\000\320'LF\342\177\000\000\060\000\000\000\000\000\000\000\377I\001\000\000\000\000\000\020\000\000\000\000\000\000\000\020\366\373)\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x7fe22efed780, 
                    exec_ = 0x5bf88f <cb_malloc(size_t)+15>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 0
                    }
                  }, 
                  expiration_ = {
                    __r = 84479
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x149ff, 
                      tiny = {
                        __data = "\377I\001\000\000\000\000\000;\235\244", '\000' <repeats 13 times>, "_n+F\342\177\000\000\200\327\376.\342\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x149ff, 
                    exec_ = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0x9, 
                      _M_refcount = {
                        _M_pi = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = 128, 
                priority_ = -41 '\327', 
                queueObserverPayload_ = 140609816586564
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#12 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#13 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#14 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#15 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#16 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#17 0x0000000000aba244 in operator() (this=0x7fe24303ecc0) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe24303ecc0: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3a80, 
            tiny = {
              __data = "\200:\353A\342\177\000\000 an invalid packet\000\000\000\000\000\000filtering_permit", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#18 operator() (__closure=0x7fe24303ecc0) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe229fbf6a0 "WriterPool1"
                }, 
                _M_string_length = 11, 
                {
                  _M_local_buf = "WriterPool1\000\000\000\000", 
                  _M_allocated_capacity = 8021036716417184343
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3a80, 
            tiny = {
              __data = "\200:\353A\342\177\000\000 an invalid packet\000\000\000\000\000\000filtering_permit", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe24303ecc0: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb3a80, 
              tiny = {
                __data = "\200:\353A\342\177\000\000 an invalid packet\000\000\000\000\000\000filtering_permit", 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#20 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#21 0x00007fe245e85ea5 in start_thread (arg=0x7fe229fd1700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe229fd1700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609343788800, 3016376877879321588, 0, 8392704, 0, 140609343788800, -3019662184000855052, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#22 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 25 (Thread 0x7fe22a7d2700 (LWP 84478)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=712770328, absSteadyTime=absSteadyTime@entry=0x7fe22a7c02f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd80d8)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770419, 
          tv_nsec = 161052250
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd80d8, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe22a7c0318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd80d8) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd80d8, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770419161052250
          }
        }
#5  0x0000000000bfea1d in futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, 
    idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:164
No locals.
#6  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd80d8, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#7  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#8  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x1443ac0, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd80d8
                }, <No data fields>}, <No data fields>}
          }
        }
#9  0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x1443ac0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#10 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1443a80, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#11 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f05400, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = 0 '\000', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x0, 
                      tiny = {
                        __data = "\000\000\000\000\000\000\000\000\320'LF\342\177\000\000\060\000\000\000\000\000\000\000\376I\001\000\000\000\000\000\b\000\000\000\000\000\000\000\020\006|*\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x7fe22f7ee780, 
                    exec_ = 0x5bf88f <cb_malloc(size_t)+15>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 0
                    }
                  }, 
                  expiration_ = {
                    __r = 84478
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x149fe, 
                      tiny = {
                        __data = "\376I\001\000\000\000\000\000;\235\244", '\000' <repeats 13 times>, "_n+F\342\177\000\000\200\347~/\342\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x149fe, 
                    exec_ = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0x1a, 
                      _M_refcount = {
                        _M_pi = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = 128, 
                priority_ = -25 '\347', 
                queueObserverPayload_ = 140609816586564
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#12 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#13 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#14 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#15 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#16 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#17 0x0000000000aba244 in operator() (this=0x7fe24303ec80) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe24303ec80: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb30f0, 
            tiny = {
              __data = "\360\060\353A\342\177", '\000' <repeats 41 times>, 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#18 operator() (__closure=0x7fe24303ec80) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe22a7c06a0 "WriterPool0"
                }, 
                _M_string_length = 11, 
                {
                  _M_local_buf = "WriterPool0\000\000\000\000", 
                  _M_allocated_capacity = 8021036716417184343
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb30f0, 
            tiny = {
              __data = "\360\060\353A\342\177", '\000' <repeats 41 times>, 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe24303ec80: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb30f0, 
              tiny = {
                __data = "\360\060\353A\342\177", '\000' <repeats 41 times>, 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#20 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#21 0x00007fe245e85ea5 in start_thread (arg=0x7fe22a7d2700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe22a7d2700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609352181504, 3016376877879321588, 0, 8392704, 0, 140609352181504, -3019656738519194636, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#22 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 24 (Thread 0x7fe22afd3700 (LWP 84477)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=721163032, absSteadyTime=absSteadyTime@entry=0x7fe22afc12f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd80c0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770419, 
          tv_nsec = 159954610
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd80c0, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe22afc1318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd80c0) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd80c0, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770419159954610
          }
        }
#5  0x0000000000bfea1d in futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, 
    idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:164
No locals.
#6  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd80c0, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#7  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#8  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x14422c0, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd80c0
                }, <No data fields>}, <No data fields>}
          }
        }
#9  0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x14422c0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#10 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1442280, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#11 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f04800, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = 0 '\000', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x0, 
                      tiny = {
                        __data = "\000\000\000\000\000\000\000\000\320'LF\342\177\000\000\060\000\000\000\000\000\000\000\375I\001", '\000' <repeats 13 times>, "\020\026\374*\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x7fe22ffef780, 
                    exec_ = 0x5bf88f <cb_malloc(size_t)+15>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 0
                    }
                  }, 
                  expiration_ = {
                    __r = 84477
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x149fd, 
                      tiny = {
                        __data = "\375I\001\000\000\000\000\000;\235\244", '\000' <repeats 13 times>, "_n+F\342\177\000\000\200\367\376/\342\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x149fd, 
                    exec_ = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0xe, 
                      _M_refcount = {
                        _M_pi = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = 128, 
                priority_ = -9 '\367', 
                queueObserverPayload_ = 140609816586564
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#12 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#13 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#14 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#15 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#16 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#17 0x0000000000aba244 in operator() (this=0x7fe24303eb80) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe24303eb80: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3ba0, 
            tiny = {
              __data = "\240;\353A\342\177\000\000y_fields", '\000' <repeats 16 times>, "\260\353\003C\342\177\000\000\000\000\000\000\000\000\000", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#18 operator() (__closure=0x7fe24303eb80) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe22afc16a0 "ReaderPool7"
                }, 
                _M_string_length = 11, 
                {
                  _M_local_buf = "ReaderPool7\000\000\000\000", 
                  _M_allocated_capacity = 8021036716148221266
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3ba0, 
            tiny = {
              __data = "\240;\353A\342\177\000\000y_fields", '\000' <repeats 16 times>, "\260\353\003C\342\177\000\000\000\000\000\000\000\000\000", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe24303eb80: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb3ba0, 
              tiny = {
                __data = "\240;\353A\342\177\000\000y_fields", '\000' <repeats 16 times>, "\260\353\003C\342\177\000\000\000\000\000\000\000\000\000", 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#20 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#21 0x00007fe245e85ea5 in start_thread (arg=0x7fe22afd3700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe22afd3700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609360574208, 3016376877879321588, 0, 8392704, 0, 140609360574208, -3019655639544437772, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#22 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 23 (Thread 0x7fe22b7d4700 (LWP 84476)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=729555736, absSteadyTime=absSteadyTime@entry=0x7fe22b7c22f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd80a8)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770419, 
          tv_nsec = 159942544
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd80a8, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe22b7c2318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd80a8) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd80a8, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770419159942544
          }
        }
#5  0x0000000000bfea1d in futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, 
    idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:164
No locals.
#6  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd80a8, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#7  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#8  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x14422c0, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd80a8
                }, <No data fields>}, <No data fields>}
          }
        }
#9  0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x14422c0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#10 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1442280, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#11 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f04800, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = 0 '\000', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x0, 
                      tiny = {
                        __data = "\000\000\000\000\000\000\000\000\320'LF\342\177\000\000\060\000\000\000\000\000\000\000\374I\001\000\000\000\000\000\340\000\000\000\000\000\000\000\020&|+\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x7fe23d2e5780, 
                    exec_ = 0x5bf88f <cb_malloc(size_t)+15>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 0
                    }
                  }, 
                  expiration_ = {
                    __r = 84476
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x149fc, 
                      tiny = {
                        __data = "\374I\001\000\000\000\000\000;\235\244", '\000' <repeats 13 times>, "_n+F\342\177\000\000\200W.=\342\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x149fc, 
                    exec_ = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0x2, 
                      _M_refcount = {
                        _M_pi = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = 128, 
                priority_ = 87 'W', 
                queueObserverPayload_ = 140609816586564
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#12 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#13 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#14 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#15 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#16 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#17 0x0000000000aba244 in operator() (this=0x7fe241eadb80) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe241eadb80: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3bd0, 
            tiny = {
              __data = "\320;\353A\342\177", '\000' <repeats 41 times>, 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#18 operator() (__closure=0x7fe241eadb80) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe22b7c26a0 "ReaderPool6"
                }, 
                _M_string_length = 11, 
                {
                  _M_local_buf = "ReaderPool6\000\000\000\000", 
                  _M_allocated_capacity = 8021036716148221266
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3bd0, 
            tiny = {
              __data = "\320;\353A\342\177", '\000' <repeats 41 times>, 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe241eadb80: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb3bd0, 
              tiny = {
                __data = "\320;\353A\342\177", '\000' <repeats 41 times>, 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#20 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#21 0x00007fe245e85ea5 in start_thread (arg=0x7fe22b7d4700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe22b7d4700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609368966912, 3016376877879321588, 0, 8392704, 0, 140609368966912, -3019658938616192012, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#22 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 22 (Thread 0x7fe22bfd5700 (LWP 84475)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=737948440, absSteadyTime=absSteadyTime@entry=0x7fe22bfc32f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd8090)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770419, 
          tv_nsec = 161096709
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd8090, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe22bfc3318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd8090) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd8090, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770419161096709
          }
        }
#5  0x0000000000bfea1d in futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, 
    idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:164
No locals.
#6  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd8090, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#7  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#8  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x14422c0, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd8090
                }, <No data fields>}, <No data fields>}
          }
        }
#9  0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x14422c0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#10 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1442280, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#11 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f04800, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = 0 '\000', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x0, 
                      tiny = {
                        __data = "\000\000\000\000\000\000\000\000\320'LF\342\177\000\000\060\000\000\000\000\000\000\000\373I\001\000\000\000\000\000\330\000\000\000\000\000\000\000\020\066\374+\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x7fe237fef780, 
                    exec_ = 0x5bf88f <cb_malloc(size_t)+15>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 0
                    }
                  }, 
                  expiration_ = {
                    __r = 84475
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x149fb, 
                      tiny = {
                        __data = "\373I\001\000\000\000\000\000;\235\244", '\000' <repeats 13 times>, "_n+F\342\177\000\000\200\367\376\067\342\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x149fb, 
                    exec_ = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0x13, 
                      _M_refcount = {
                        _M_pi = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = 128, 
                priority_ = -9 '\367', 
                queueObserverPayload_ = 140609816586564
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#12 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#13 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#14 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#15 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#16 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#17 0x0000000000aba244 in operator() (this=0x7fe241eadac0) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe241eadac0: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3210, 
            tiny = {
              __data = "\020\062\353A\342\177", '\000' <repeats 41 times>, 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#18 operator() (__closure=0x7fe241eadac0) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe22bfc36a0 "ReaderPool5"
                }, 
                _M_string_length = 11, 
                {
                  _M_local_buf = "ReaderPool5\000\000\000\000", 
                  _M_allocated_capacity = 8021036716148221266
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3210, 
            tiny = {
              __data = "\020\062\353A\342\177", '\000' <repeats 41 times>, 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe241eadac0: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb3210, 
              tiny = {
                __data = "\020\062\353A\342\177", '\000' <repeats 41 times>, 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#20 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#21 0x00007fe245e85ea5 in start_thread (arg=0x7fe22bfd5700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe22bfd5700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609377359616, 3016376877879321588, 0, 8392704, 0, 140609377359616, -3019657839641435148, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#22 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 21 (Thread 0x7fe22c7d6700 (LWP 84474)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=746341144, absSteadyTime=absSteadyTime@entry=0x7fe22c7c42f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd8078)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770419, 
          tv_nsec = 159376998
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd8078, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe22c7c4318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd8078) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd8078, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770419159376998
          }
        }
#5  0x0000000000bfea1d in futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, 
    idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:164
No locals.
#6  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd8078, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#7  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#8  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x14422c0, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd8078
                }, <No data fields>}, <No data fields>}
          }
        }
#9  0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x14422c0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#10 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1442280, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#11 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f04800, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = 0 '\000', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x0, 
                      tiny = {
                        __data = "\000\000\000\000\000\000\000\000\320'LF\342\177\000\000\060\000\000\000\000\000\000\000\372I\001\000\000\000\000\000\320\000\000\000\000\000\000\000\020F|,\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x7fe23e2e7780, 
                    exec_ = 0x5bf88f <cb_malloc(size_t)+15>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 0
                    }
                  }, 
                  expiration_ = {
                    __r = 84474
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x149fa, 
                      tiny = {
                        __data = "\372I\001\000\000\000\000\000;\235\244", '\000' <repeats 13 times>, "_n+F\342\177\000\000\200w.>\342\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x149fa, 
                    exec_ = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0x7, 
                      _M_refcount = {
                        _M_pi = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = 128, 
                priority_ = 119 'w', 
                queueObserverPayload_ = 140609816586564
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#12 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#13 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#14 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#15 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#16 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#17 0x0000000000aba244 in operator() (this=0x7fe241eadb40) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe241eadb40: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3930, 
            tiny = {
              __data = "09\353A\342\177", '\000' <repeats 41 times>, 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#18 operator() (__closure=0x7fe241eadb40) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe22c7c46a0 "ReaderPool4"
                }, 
                _M_string_length = 11, 
                {
                  _M_local_buf = "ReaderPool4\000\000\000\000", 
                  _M_allocated_capacity = 8021036716148221266
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3930, 
            tiny = {
              __data = "09\353A\342\177", '\000' <repeats 41 times>, 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe241eadb40: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb3930, 
              tiny = {
                __data = "09\353A\342\177", '\000' <repeats 41 times>, 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#20 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#21 0x00007fe245e85ea5 in start_thread (arg=0x7fe22c7d6700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe22c7d6700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609385752320, 3016376877879321588, 0, 8392704, 0, 140609385752320, -3019652342620167180, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#22 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 20 (Thread 0x7fe22cfd7700 (LWP 84473)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=754733848, absSteadyTime=absSteadyTime@entry=0x7fe22cfc52f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd8060)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770419, 
          tv_nsec = 158883281
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd8060, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe22cfc5318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd8060) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd8060, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770419158883281
          }
        }
#5  0x0000000000bfea1d in futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, 
    idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:164
No locals.
#6  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd8060, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#7  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#8  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x14422c0, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd8060
                }, <No data fields>}, <No data fields>}
          }
        }
#9  0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x14422c0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#10 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1442280, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#11 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f04800, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = 104 'h', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x68, 
                      tiny = {
                        __data = "h\000\000\000\000\000\000\000h\000\000\000\000\000\000\000\350\000\000\000\000\000\000\000\366\371[\000\000\000\000\000\270U\374,\342\177\000\000\320'LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x7fe243035300, 
                    exec_ = 0x7fe2462b1ce6 <std::_Hashtable<unsigned long, std::pair<unsigned long const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<unsigned long const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >::_M_rehash(unsigned long, unsigned long const&)+214>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 104
                    }
                  }, 
                  expiration_ = {
                    __r = 140609818732496
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x7fe242078e80, 
                      tiny = {
                        __data = "\200\216\aB\342\177\000\000;\235\244", '\000' <repeats 13 times>, "\305n+F\342\177\000\000\000R\003C\342\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x149f9, 
                    exec_ = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0x7, 
                      _M_refcount = {
                        _M_pi = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = 128, 
                priority_ = 87 'W', 
                queueObserverPayload_ = 140609816586564
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#12 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#13 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#14 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#15 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#16 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#17 0x0000000000aba244 in operator() (this=0x7fe241eadb00) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe241eadb00: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3a50, 
            tiny = {
              __data = "P:\353A\342\177", '\000' <repeats 41 times>, 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#18 operator() (__closure=0x7fe241eadb00) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe22cfc56a0 "ReaderPool3"
                }, 
                _M_string_length = 11, 
                {
                  _M_local_buf = "ReaderPool3\000\000\000\000", 
                  _M_allocated_capacity = 8021036716148221266
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3a50, 
            tiny = {
              __data = "P:\353A\342\177", '\000' <repeats 41 times>, 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe241eadb00: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb3a50, 
              tiny = {
                __data = "P:\353A\342\177", '\000' <repeats 41 times>, 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#20 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#21 0x00007fe245e85ea5 in start_thread (arg=0x7fe22cfd7700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe22cfd7700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609394145024, 3016376877879321588, 0, 8392704, 0, 140609394145024, -3019651243645410316, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#22 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 19 (Thread 0x7fe22effd700 (LWP 84472)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=788443928, absSteadyTime=absSteadyTime@entry=0x7fe22efeb2f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd8048)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770419, 
          tv_nsec = 161595743
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd8048, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe22efeb318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd8048) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd8048, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770419161595743
          }
        }
#5  0x0000000000bfea1d in futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, 
    idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:164
No locals.
#6  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd8048, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#7  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#8  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x14422c0, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd8048
                }, <No data fields>}, <No data fields>}
          }
        }
#9  0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x14422c0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#10 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1442280, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#11 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f04800, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = 0 '\000', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x0, 
                      tiny = {
                        __data = "\000\000\000\000\000\000\000\000\320'LF\342\177\000\000\060\000\000\000\000\000\000\000\370I\001\000\000\000\000\000X\000\000\000\000\000\000\000\020\266\376.\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x7fe22f7ee780, 
                    exec_ = 0x5bf88f <cb_malloc(size_t)+15>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 0
                    }
                  }, 
                  expiration_ = {
                    __r = 84472
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x149f8, 
                      tiny = {
                        __data = "\370I\001\000\000\000\000\000;\235\244", '\000' <repeats 13 times>, "_n+F\342\177\000\000\200\347~/\342\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x149f8, 
                    exec_ = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0x8, 
                      _M_refcount = {
                        _M_pi = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = 128, 
                priority_ = -25 '\347', 
                queueObserverPayload_ = 140609816586564
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#12 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#13 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#14 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#15 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#16 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#17 0x0000000000aba244 in operator() (this=0x7fe241e9f0c0) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe241e9f0c0: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3ab0, 
            tiny = {
              __data = "\260:\353A\342\177\000\000ET TRANSACTION ISOLATION statement was e", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#18 operator() (__closure=0x7fe241e9f0c0) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe22efeb6a0 "ReaderPool2"
                }, 
                _M_string_length = 11, 
                {
                  _M_local_buf = "ReaderPool2\000\000\000\000", 
                  _M_allocated_capacity = 8021036716148221266
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3ab0, 
            tiny = {
              __data = "\260:\353A\342\177\000\000ET TRANSACTION ISOLATION statement was e", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe241e9f0c0: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb3ab0, 
              tiny = {
                __data = "\260:\353A\342\177\000\000ET TRANSACTION ISOLATION statement was e", 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#20 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#21 0x00007fe245e85ea5 in start_thread (arg=0x7fe22effd700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe22effd700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609427855104, 3016376877879321588, 0, 8392704, 0, 140609427855104, -3019646831640255500, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#22 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 18 (Thread 0x7fe22f7fe700 (LWP 84471)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=796836632, absSteadyTime=absSteadyTime@entry=0x7fe22f7ec2f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd8030)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770419, 
          tv_nsec = 161032252
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd8030, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe22f7ec318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd8030) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd8030, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770419161032252
          }
        }
#5  0x0000000000bfea1d in futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, 
    idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:164
No locals.
#6  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd8030, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#7  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#8  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x14422c0, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd8030
                }, <No data fields>}, <No data fields>}
          }
        }
#9  0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x14422c0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#10 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1442280, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#11 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f04800, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = 0 '\000', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x0, 
                      tiny = {
                        __data = "\000\000\000\000\000\000\000\000\320'LF\342\177\000\000\060\000\000\000\000\000\000\000\367I\001\000\000\000\000\000P\000\000\000\000\000\000\000\020\306~/\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x7fe22ffef780, 
                    exec_ = 0x5bf88f <cb_malloc(size_t)+15>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 0
                    }
                  }, 
                  expiration_ = {
                    __r = 84471
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x149f7, 
                      tiny = {
                        __data = "\367I\001\000\000\000\000\000;\235\244", '\000' <repeats 13 times>, "_n+F\342\177\000\000\200\367\376/\342\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x149f7, 
                    exec_ = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0x3, 
                      _M_refcount = {
                        _M_pi = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = 128, 
                priority_ = -9 '\367', 
                queueObserverPayload_ = 140609816586564
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#12 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#13 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#14 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#15 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#16 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#17 0x0000000000aba244 in operator() (this=0x7fe241e9f080) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe241e9f080: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3a20, 
            tiny = {
              __data = " :\353A\342\177\000\000OLLBACK TRANSACTION TO SAVEPOINT stateme", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#18 operator() (__closure=0x7fe241e9f080) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe22f7ec6a0 "ReaderPool1"
                }, 
                _M_string_length = 11, 
                {
                  _M_local_buf = "ReaderPool1\000\000\000\000", 
                  _M_allocated_capacity = 8021036716148221266
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3a20, 
            tiny = {
              __data = " :\353A\342\177\000\000OLLBACK TRANSACTION TO SAVEPOINT stateme", 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe241e9f080: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb3a20, 
              tiny = {
                __data = " :\353A\342\177\000\000OLLBACK TRANSACTION TO SAVEPOINT stateme", 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#20 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#21 0x00007fe245e85ea5 in start_thread (arg=0x7fe22f7fe700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe22f7fe700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609436247808, 3016376877879321588, 0, 8392704, 0, 140609436247808, -3019650130712009740, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#22 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 17 (Thread 0x7fe22ffff700 (LWP 84470)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x0000000000beeaed in nativeFutexWaitImpl (waitMask=waitMask@entry=805229336, absSteadyTime=absSteadyTime@entry=0x7fe22ffed2f8, absSystemTime=absSystemTime@entry=0x0, expected=expected@entry=2, addr=addr@entry=0x7fe22cfd8018)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:123
        op = <optimized out>
        ts = {
          tv_sec = 9770419, 
          tv_nsec = 159952574
        }
        timeout = <optimized out>
        rv = <optimized out>
#2  folly::detail::futexWaitImpl (futex=futex@entry=0x7fe22cfd8018, expected=expected@entry=2, absSystemTime=absSystemTime@entry=0x0, absSteadyTime=absSteadyTime@entry=0x7fe22ffed318, waitMask=waitMask@entry=4294967295)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex.cpp:254
No locals.
#3  0x0000000000bf8bba in futexWaitImpl<std::atomic<unsigned int> const, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (waitMask=4294967295, deadline=..., expected=2, 
    futex=0x7fe22cfd8018) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:85
No locals.
#4  folly::detail::futexWaitUntil<std::atomic<unsigned int>, std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (futex=futex@entry=0x7fe22cfd8018, expected=expected@entry=2, deadline=..., 
    waitMask=waitMask@entry=4294967295) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/Futex-inl.h:123
        converted = {
          __d = {
            __r = 9770419159952574
          }
        }
#5  0x0000000000bfea1d in futexWaitUntil<std::atomic<unsigned int>, std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > > (timeoutVariationFrac=0.5, stackToRetain=1024, 
    idleTimeout=..., waitMask=4294967295, deadline=..., expected=2, fut=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/detail/MemoryIdler.h:164
No locals.
#6  folly::SaturatingSemaphore<true, std::atomic>::tryWaitSlow<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x7fe22cfd8018, deadline=..., opt=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:318
        before = <optimized out>
#7  0x0000000000bff086 in try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (opt=..., deadline=..., this=<optimized out>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/SaturatingSemaphore.h:179
No locals.
#8  folly::detail::LifoSemBase<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>::try_wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l> > > (this=this@entry=0x14422c0, deadline=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:521
        node = {
          _M_t = {
            _M_t = {
              <std::_Tuple_impl<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                <std::_Tuple_impl<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic> >> = {
                  <std::_Head_base<1, folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>, true>> = {
                    <folly::detail::LifoSemNodeRecycler<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                <std::_Head_base<0, folly::detail::LifoSemNode<folly::SaturatingSemaphore<true, std::atomic>, std::atomic>*, false>> = {
                  _M_head_impl = 0x7fe22cfd8018
                }, <No data fields>}, <No data fields>}
          }
        }
#9  0x0000000000c027e0 in try_wait_for<long, std::ratio<1, 1000> > (timeout=<synthetic pointer>, this=0x14422c0)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/synchronization/LifoSem.h:498
No locals.
#10 folly::UnboundedBlockingQueue<folly::CPUThreadPoolExecutor::CPUTask>::try_take_for (this=0x1442280, time=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/task_queue/UnboundedBlockingQueue.h:41
No locals.
#11 0x0000000000bf6d57 in folly::CPUThreadPoolExecutor::threadRun (this=0x7fe241f04800, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:243
        task = {
          storage_ = {
            {
              emptyState = 0 '\000', 
              value = {
                <folly::ThreadPoolExecutor::Task> = {
                  func_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x0, 
                      tiny = {
                        __data = "\000\000\000\000\000\000\000\000\320'LF\342\177\000\000\060\000\000\000\000\000\000\000\366I\001\000\000\000\000\000H\000\000\000\000\000\000\000\020\326\376/\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x7fe23cae4780, 
                    exec_ = 0x5bf88f <cb_malloc(size_t)+15>
                  }, 
                  enqueueTime_ = {
                    __d = {
                      __r = 0
                    }
                  }, 
                  expiration_ = {
                    __r = 84470
                  }, 
                  expireCallback_ = {
                    <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
                    members of folly::Function<void()>: 
                    data_ = {
                      big = 0x149f6, 
                      tiny = {
                        __data = "\366I\001\000\000\000\000\000;\235\244", '\000' <repeats 13 times>, "_n+F\342\177\000\000\200G\256<\342\177\000\000@\006LF\342\177\000", 
                        __align = {<No data fields>}
                      }
                    }, 
                    call_ = 0x149f6, 
                    exec_ = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                  }, 
                  context_ = {
                    <std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {
                      <std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                      members of std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>: 
                      _M_ptr = 0xb, 
                      _M_refcount = {
                        _M_pi = 0x7fe2464c2810 <phosphor::TraceLog::getInstance()::log_instance+8656>
                      }
                    }, <No data fields>}
                }, 
                members of folly::CPUThreadPoolExecutor::CPUTask: 
                poison = 128, 
                priority_ = 71 'G', 
                queueObserverPayload_ = 140609816586564
              }
            }, 
            hasValue = false
          }
        }
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xcdf7cb "CPUThreadPoolExecutor", 
                e_ = 0xcdf7e0 ""
              }
            }
          }
        }
#12 0x0000000000c11fc9 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, 
    __f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#13 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#14 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#15 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#16 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#17 0x0000000000aba244 in operator() (this=0x7fe241f07f80) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7fe241f07f80: {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3ae0, 
            tiny = {
              __data = "\340:\353A\342\177", '\000' <repeats 41 times>, 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#18 operator() (__closure=0x7fe241f07f80) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/executor/folly_executorpool.cc:47
        threadNameOpt = {
          storage_ = {
            {
              emptyState = -96 '\240', 
              value = {
                static npos = 18446744073709551615, 
                _M_dataplus = {
                  <std::allocator<char>> = {
                    <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                  members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                  _M_p = 0x7fe22ffed6a0 "ReaderPool0"
                }, 
                _M_string_length = 11, 
                {
                  _M_local_buf = "ReaderPool0\000\000\000\000", 
                  _M_allocated_capacity = 8021036716148221266
                }
              }
            }, 
            hasValue = true
          }
        }
        func = {
          <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
          members of folly::Function<void()>: 
          data_ = {
            big = 0x7fe241eb3ae0, 
            tiny = {
              __data = "\340:\353A\342\177", '\000' <repeats 41 times>, 
              __align = {<No data fields>}
            }
          }, 
          call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
          exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
        }
#19 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/toy-unix-simple/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7fe241f07f80: {
          __func = {
            <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
            members of folly::Function<void()>: 
            data_ = {
              big = 0x7fe241eb3ae0, 
              tiny = {
                __data = "\340:\353A\342\177", '\000' <repeats 41 times>, 
                __align = {<No data fields>}
              }
            }, 
            call_ = 0xc11f80 <folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&)>, 
            exec_ = 0xc11870 <folly::detail::function::execBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data*)>
          }
        }
#20 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#21 0x00007fe245e85ea5 in start_thread (arg=0x7fe22ffff700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe22ffff700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609444640512, 3016376877879321588, 0, 8392704, 0, 140609444640512, -3019649031737252876, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#22 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 16 (Thread 0x7fe2367fc700 (LWP 84469)):
#0  0x00007fe2437c6eb3 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fe24515a3c5 in epoll_dispatch (base=0x7fe241ec3b00, tv=<optimized out>) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/epoll.c:465
        epollop = 0x7fe241e867a0
        events = 0x7fe24301ff80
        i = <optimized out>
        res = <optimized out>
        timeout = <optimized out>
        __func__ = "epoll_dispatch"
#2  0x00007fe245151376 in event_base_loop (base=0x7fe241ec3b00, flags=1) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/event.c:1998
        evsel = 0x7fe245364c20 <epollops>
        tv = {
          tv_sec = 48, 
          tv_usec = 140609745962736
        }
        tv_p = <optimized out>
        res = <optimized out>
        done = 0
        retval = 0
        __func__ = "event_base_loop"
#3  0x0000000000c186f7 in folly::EventBase::loopBody (this=this@entry=0x7fe241f5c6f0, flags=flags@entry=0, ignoreKeepAlive=ignoreKeepAlive@entry=false)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:397
        callbacks = {
          <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
            static constant_time_size = false, 
            static stateful_value_traits = <optimized out>, 
            static has_container_from_iterator = <optimized out>, 
            static safemode_or_autounlink = true, 
            data_ = {
              <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                static link_mode = boost::intrusive::auto_unlink
              }, 
              members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
              root_plus_size_ = {
                <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                  static constant_time_size = <optimized out>
                }, 
                members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                m_header = {
                  <boost::intrusive::list_node<void*>> = {
                    next_ = 0x7fe2367ea620, 
                    prev_ = 0x7fe2367ea620
                  }, <No data fields>}
              }
            }
          }, <No data fields>}
        message = 0xce1548 "Your code just tried to loop over an event base from inside another event base loop. Since libevent is not reentrant, this leads to undefined behavior in opt builds. Please fix immediately. For the co"...
        SCOPE_EXIT_STATE13 = {
          <folly::detail::ScopeGuardImplBase> = {
            dismissed_ = false
          }, 
          members of folly::detail::ScopeGuardImpl<folly::EventBase::loopBody(int, bool)::<lambda()>, true>: 
          function_ = {
            __this = 0x7fe241f5c6f0
          }
        }
        res = 0
        ranLoopCallbacks = <optimized out>
        blocking = true
        once = false
        prev = {
          __d = {
            __r = 9751039117544078
          }
        }
        idleStart = {
          __d = {
            __r = 9770378897791799
          }
        }
        busy = <optimized out>
        idle = <optimized out>
        prevLoopThread = {
          _M_thread = 0
        }
#4  0x0000000000c18bc6 in folly::EventBase::loop (this=this@entry=0x7fe241f5c6f0) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:315
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xce11bb "EventBase", 
                e_ = 0xce11c4 ""
              }
            }
          }
        }
#5  0x0000000000c1a586 in folly::EventBase::loopForever (this=this@entry=0x7fe241f5c6f0) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:538
        ret = <optimized out>
#6  0x00000000005b0339 in worker_libevent (arg=0x7fe241f5c6e0) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/daemon/thread.cc:115
        me = @0x7fe241f5c6e0: {
          thread_id = 140609553680128, 
          eventBase = {
            <folly::TimeoutManager> = {
              _vptr.TimeoutManager = 0x1091d68 <vtable for folly::EventBase+24>, 
              cobTimeouts_ = {
                _M_t = {
                  _M_t = {
                    <std::_Tuple_impl<0, folly::TimeoutManager::CobTimeouts*, std::default_delete<folly::TimeoutManager::CobTimeouts> >> = {
                      <std::_Tuple_impl<1, std::default_delete<folly::TimeoutManager::CobTimeouts> >> = {
                        <std::_Head_base<1, std::default_delete<folly::TimeoutManager::CobTimeouts>, true>> = {
                          <std::default_delete<folly::TimeoutManager::CobTimeouts>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                      <std::_Head_base<0, folly::TimeoutManager::CobTimeouts*, false>> = {
                        _M_head_impl = 0x7fe2430422f0
                      }, <No data fields>}, <No data fields>}
                }
              }
            }, 
            <folly::DrivableExecutor> = {
              <folly::Executor> = {
                _vptr.Executor = 0x1091e28 <vtable for folly::EventBase+216>, 
                static LO_PRI = -128 '\200', 
                static MID_PRI = 0 '\000', 
                static HI_PRI = 127 '\177'
              }, <No data fields>}, 
            <folly::IOExecutor> = {<No data fields>}, 
            <folly::SequencedExecutor> = {<No data fields>}, 
            <folly::ScheduledExecutor> = {<No data fields>}, 
            members of folly::EventBase: 
            intervalDuration_ = {
              __r = 10
            }, 
            wheelTimer_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::HHWheelTimerBase<std::chrono::duration<long, std::ratio<1, 1000> > >*, folly::DelayedDestruction::Destructor>> = {
                    <std::_Tuple_impl<1, folly::DelayedDestruction::Destructor>> = {
                      <std::_Head_base<1, folly::DelayedDestruction::Destructor, true>> = {
                        <folly::DelayedDestruction::Destructor> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::HHWheelTimerBase<std::chrono::duration<long, std::ratio<1, 1000> > >*, false>> = {
                      _M_head_impl = 0x0
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            loopCallbacks_ = {
              <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
                static constant_time_size = false, 
                static stateful_value_traits = <optimized out>, 
                static has_container_from_iterator = <optimized out>, 
                static safemode_or_autounlink = true, 
                data_ = {
                  <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                    <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                    members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                    static link_mode = boost::intrusive::auto_unlink
                  }, 
                  members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
                  root_plus_size_ = {
                    <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                      static constant_time_size = <optimized out>
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                    m_header = {
                      <boost::intrusive::list_node<void*>> = {
                        next_ = 0x7fe241f5c730, 
                        prev_ = 0x7fe241f5c730
                      }, <No data fields>}
                  }
                }
              }, <No data fields>}, 
            runBeforeLoopCallbacks_ = {
              <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
                static constant_time_size = false, 
                static stateful_value_traits = <optimized out>, 
                static has_container_from_iterator = <optimized out>, 
                static safemode_or_autounlink = true, 
                data_ = {
                  <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                    <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                    members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                    static link_mode = boost::intrusive::auto_unlink
                  }, 
                  members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
                  root_plus_size_ = {
                    <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                      static constant_time_size = <optimized out>
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                    m_header = {
                      <boost::intrusive::list_node<void*>> = {
                        next_ = 0x7fe241f5c740, 
                        prev_ = 0x7fe241f5c740
                      }, <No data fields>}
                  }
                }
              }, <No data fields>}, 
            onDestructionCallbacks_ = {
              <folly::SynchronizedBase<folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >, (folly::detail::MutexLevel)2>> = {
                <folly::SynchronizedBase<folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >, (folly::detail::MutexLevel)1>> = {<No data fields>}, <No data fields>}, 
              members of folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >: 
              static nxCopyCtor = <error reading variable: No global symbol "folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >::nxCopyCtor".>, 
              static nxMoveCtor = <error reading variable: No global symbol "folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >::nxMoveCtor".>, 
              datum_ = {
                <boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>> = {
                  static constant_time_size = true, 
                  static stateful_value_traits = <optimized out>, 
                  static has_container_from_iterator = <optimized out>, 
                  static safemode_or_autounlink = false, 
                  data_ = {
                    <boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>> = {
                      static link_mode = boost::intrusive::normal_link
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>::data_t: 
                    root_plus_size_ = {
                      <boost::intrusive::detail::size_holder<true, unsigned long, void>> = {
                        static constant_time_size = <optimized out>, 
                        size_ = 0
                      }, 
                      members of boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>::root_plus_size: 
                      m_header = {
                        <boost::intrusive::list_node<void*>> = {
                          next_ = 0x7fe241f5c758, 
                          prev_ = 0x7fe241f5c758
                        }, <No data fields>}
                    }
                  }
                }, <No data fields>}, 
              mutex_ = {
                static kReaderPriority = false, 
                state_ = {
                  <std::__atomic_base<unsigned int>> = {
                    static _S_alignment = 4, 
                    _M_i = 0
                  }, 
                  members of std::atomic<unsigned int>: 
                  static is_always_lock_free = true
                }, 
                static kIncrHasS = 2048, 
                static kHasS = 4294965248, 
                static kAnnotationCreated = 1024, 
                static kMayDefer = 512, 
                static kPrevDefer = 256, 
                static kHasE = 128, 
                static kBegunE = 64, 
                static kHasU = 32, 
                static kHasSolo = 224, 
                static kWaitingNotS = 16, 
                static kWaitingESingle = 4, 
                static kWaitingEMultiple = 8, 
                static kWaitingE = 12, 
                static kWaitingU = 2, 
                static kWaitingS = 1, 
                static kWaitingAny = 31, 
                static kNumSharedToStartDeferring = 2, 
                static kMaxSpinCount = 1000, 
                static kMaxSoftYieldCount = 1000, 
                static kDeferredSearchDistance = 2, 
                static kDeferredSeparationFactor = 4, 
                static kTokenStackTLSCapacity = 2, 
                static kTokenless = 1, 
                static tls_lastTokenlessSlot = 2, 
                static tls_lastDeferredReaderSlot = 2, 
                static deferredReaders = {{
                    <std::__atomic_base<unsigned long>> = {
                      static _S_alignment = 8, 
                      _M_i = 0
                    }, 
                    members of std::atomic<unsigned long>: 
                    static is_always_lock_free = true
                  } <repeats 2048 times>}
              }
            }, 
            runOnceCallbacks_ = 0x0, 
            stop_ = {
              _M_base = {
                static _S_alignment = 1, 
                _M_i = false
              }, 
              static is_always_lock_free = true
            }, 
            loopThread_ = {
              static _S_min_alignment = 8, 
              static _S_alignment = 8, 
              _M_i = {
                _M_thread = 140609553680128
              }, 
              static is_always_lock_free = <error reading variable: No global symbol "std::atomic<std::thread::id>::is_always_lock_free".>
            }, 
            queue_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::NotificationQueue<folly::Function<void()> >*, std::default_delete<folly::NotificationQueue<folly::Function<void()> > > >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::NotificationQueue<folly::Function<void()> > > >> = {
                      <std::_Head_base<1, std::default_delete<folly::NotificationQueue<folly::Function<void()> > >, true>> = {
                        <std::default_delete<folly::NotificationQueue<folly::Function<void()> > >> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::NotificationQueue<folly::Function<void()> >*, false>> = {
                      _M_head_impl = 0x7fe241f07e00
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            fnRunner_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::EventBase::FunctionRunner*, std::default_delete<folly::EventBase::FunctionRunner> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::EventBase::FunctionRunner> >> = {
                      <std::_Head_base<1, std::default_delete<folly::EventBase::FunctionRunner>, true>> = {
                        <std::default_delete<folly::EventBase::FunctionRunner>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::EventBase::FunctionRunner*, false>> = {
                      _M_head_impl = 0x7fe243035100
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            loopKeepAliveCount_ = 1, 
            loopKeepAliveCountAtomic_ = {
              <std::__atomic_base<long>> = {
                static _S_alignment = 8, 
                _M_i = 0
              }, 
              members of std::atomic<long>: 
              static is_always_lock_free = true
            }, 
            loopKeepAliveActive_ = true, 
            maxLatency_ = {
              __r = 0
            }, 
            avgLoopTime_ = {
              expCoeff_ = -4.9999999999999998e-07, 
              value_ = 32.549400659939934, 
              buffer_time_ = {
                __r = 740
              }, 
              busy_buffer_ = {
                __r = 1
              }, 
              buffer_cnt_ = 7, 
              static buffer_interval_ = {
                __r = 10
              }
            }, 
            maxLatencyLoopTime_ = {
              expCoeff_ = -4.9999999999999998e-07, 
              value_ = 32.549400659939934, 
              buffer_time_ = {
                __r = 740
              }, 
              busy_buffer_ = {
                __r = 1
              }, 
              buffer_cnt_ = 7, 
              static buffer_interval_ = {
                __r = 10
              }
            }, 
            maxLatencyCob_ = {
              <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
              members of folly::Function<void()>: 
              data_ = {
                big = 0x0, 
                tiny = {
                  __data = '\000' <repeats 47 times>, 
                  __align = {<No data fields>}
                }
              }, 
              call_ = 0x4664dd <folly::detail::function::FunctionTraits<void ()>::uninitCall(folly::detail::function::Data&)>, 
              exec_ = 0x0
            }, 
            enableTimeMeasurement_ = true, 
            nextLoopCnt_ = 8052283, 
            latestLoopCnt_ = 8052282, 
            startWork_ = {
              __d = {
                __r = 9770378897790756
              }
            }, 
            invokingLoop_ = true, 
            observer_ = {
              <std::__shared_ptr<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2>> = {
                <std::__shared_ptr_access<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                members of std::__shared_ptr<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2>: 
                _M_ptr = 0x0, 
                _M_refcount = {
                  _M_pi = 0x0
                }
              }, <No data fields>}, 
            observerSampleCount_ = 0, 
            executionObserver_ = 0x0, 
            name_ = {
              static npos = 18446744073709551615, 
              _M_dataplus = {
                <std::allocator<char>> = {
                  <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                _M_p = 0x7fe241f5c8a8 ""
              }, 
              _M_string_length = 0, 
              {
                _M_local_buf = '\000' <repeats 15 times>, 
                _M_allocated_capacity = 0
              }
            }, 
            localStorage_ = {
              _M_h = {
                <std::__detail::_Hashtable_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<false, false, true> >> = {
                  <std::__detail::_Hash_code_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::__detail::_Select1st, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, false>> = {
                    <std::__detail::_Hashtable_ebo_helper<0, std::__detail::_Select1st, true>> = {
                      <std::__detail::_Select1st> = {<No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<1, std::hash<unsigned long>, true>> = {
                      <std::hash<unsigned long>> = {
                        <std::__hash_base<unsigned long, unsigned long>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<2, std::__detail::_Mod_range_hashing, true>> = {
                      <std::__detail::_Mod_range_hashing> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                  <std::__detail::_Hashtable_ebo_helper<0, std::equal_to<unsigned long>, true>> = {
                    <std::equal_to<unsigned long>> = {
                      <std::binary_function<unsigned long, unsigned long, bool>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                <std::__detail::_Map_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, true>> = {<No data fields>}, 
                <std::__detail::_Insert<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, false>> = {
                  <std::__detail::_Insert_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >> = {<No data fields>}, <No data fields>}, 
                <std::__detail::_Rehash_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, std::integral_constant<bool, true> >> = {<No data fields>}, 
                <std::__detail::_Equality<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, true>> = {<No data fields>}, 
                <std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> > >> = {
                  <std::__detail::_Hashtable_ebo_helper<0, std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >, true>> = {
                    <std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >> = {
                      <__gnu_cxx::new_allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                members of std::_Hashtable<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >: 
                _M_buckets = 0x7fe241f5c8e8, 
                _M_bucket_count = 1, 
                _M_before_begin = {
                  _M_nxt = 0x0
                }, 
                _M_element_count = 0, 
                _M_rehash_policy = {
                  static _S_growth_factor = 2, 
                  _M_max_load_factor = 1, 
                  _M_next_resize = 0
                }, 
                _M_single_bucket = 0x0
              }
            }, 
            localStorageToDtor_ = {
              _M_h = {
                <std::__detail::_Hashtable_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<false, true, true> >> = {
                  <std::__detail::_Hash_code_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::__detail::_Identity, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, false>> = {
                    <std::__detail::_Hashtable_ebo_helper<0, std::__detail::_Identity, true>> = {
                      <std::__detail::_Identity> = {<No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<1, std::hash<folly::detail::EventBaseLocalBaseBase*>, true>> = {
                      <std::hash<folly::detail::EventBaseLocalBaseBase*>> = {
                        <std::__hash_base<unsigned long, folly::detail::EventBaseLocalBaseBase*>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<2, std::__detail::_Mod_range_hashing, true>> = {
                      <std::__detail::_Mod_range_hashing> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                  <std::__detail::_Hashtable_ebo_helper<0, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, true>> = {
                    <std::equal_to<folly::detail::EventBaseLocalBaseBase*>> = {
                      <std::binary_function<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, bool>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                <std::__detail::_Map_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {<No data fields>}, 
                <std::__detail::_Insert<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {
                  <std::__detail::_Insert_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true> >> = {<No data fields>}, <No data fields>}, 
                <std::__detail::_Rehash_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, std::integral_constant<bool, true> >> = {<No data fields>}, 
                <std::__detail::_Equality<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {<No data fields>}, 
                <std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> > >> = {
                  <std::__detail::_Hashtable_ebo_helper<0, std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >, true>> = {
                    <std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >> = {
                      <__gnu_cxx::new_allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                members of std::_Hashtable<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true> >: 
                _M_buckets = 0x7fe241f5c920, 
                _M_bucket_count = 1, 
                _M_before_begin = {
                  _M_nxt = 0x0
                }, 
                _M_element_count = 0, 
                _M_rehash_policy = {
                  static _S_growth_factor = 2, 
                  _M_max_load_factor = 1, 
                  _M_next_resize = 0
                }, 
                _M_single_bucket = 0x0
              }
            }, 
            virtualEventBaseInitFlag_ = {
              called_ = {
                _M_base = {
                  static _S_alignment = 1, 
                  _M_i = false
                }, 
                static is_always_lock_free = true
              }, 
              mutex_ = {
                static kReaderPriority = false, 
                state_ = {
                  <std::__atomic_base<unsigned int>> = {
                    static _S_alignment = 4, 
                    _M_i = 0
                  }, 
                  members of std::atomic<unsigned int>: 
                  static is_always_lock_free = true
                }, 
                static kIncrHasS = 2048, 
                static kHasS = 4294965248, 
                static kAnnotationCreated = 1024, 
                static kMayDefer = 512, 
                static kPrevDefer = 256, 
                static kHasE = 128, 
                static kBegunE = 64, 
                static kHasU = 32, 
                static kHasSolo = 224, 
                static kWaitingNotS = 16, 
                static kWaitingESingle = 4, 
                static kWaitingEMultiple = 8, 
                static kWaitingE = 12, 
                static kWaitingU = 2, 
                static kWaitingS = 1, 
                static kWaitingAny = 31, 
                static kNumSharedToStartDeferring = 2, 
                static kMaxSpinCount = 1000, 
                static kMaxSoftYieldCount = 1000, 
                static kDeferredSearchDistance = 2, 
                static kDeferredSeparationFactor = 4, 
                static kTokenStackTLSCapacity = 2, 
                static kTokenless = 1, 
                static tls_lastTokenlessSlot = 2, 
                static tls_lastDeferredReaderSlot = 2, 
                static deferredReaders = {{
                    <std::__atomic_base<unsigned long>> = {
                      static _S_alignment = 8, 
                      _M_i = 0
                    }, 
                    members of std::atomic<unsigned long>: 
                    static is_always_lock_free = true
                  } <repeats 2048 times>}
              }
            }, 
            virtualEventBase_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::VirtualEventBase*, std::default_delete<folly::VirtualEventBase> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::VirtualEventBase> >> = {
                      <std::_Head_base<1, std::default_delete<folly::VirtualEventBase>, true>> = {
                        <std::default_delete<folly::VirtualEventBase>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::VirtualEventBase*, false>> = {
                      _M_head_impl = 0x0
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            evb_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::EventBaseBackendBase*, std::default_delete<folly::EventBaseBackendBase> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::EventBaseBackendBase> >> = {
                      <std::_Head_base<1, std::default_delete<folly::EventBaseBackendBase>, true>> = {
                        <std::default_delete<folly::EventBaseBackendBase>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::EventBaseBackendBase*, false>> = {
                      _M_head_impl = 0x7fe243042300
                    }, <No data fields>}, <No data fields>}
              }
            }
          }, 
          mutex = {
            <std::__mutex_base> = {
              _M_mutex = {
                __data = {
                  __lock = 0, 
                  __count = 0, 
                  __owner = 0, 
                  __nusers = 0, 
                  __kind = 0, 
                  __spins = 0, 
                  __elision = 0, 
                  __list = {
                    __prev = 0x0, 
                    __next = 0x0
                  }
                }, 
                __size = '\000' <repeats 39 times>, 
                __align = 0
              }
            }, <No data fields>}, 
          index = 6, 
          subdoc_op = {
            m_path = 0x7fe241f4e300, 
            m_jsn = 0x1440760, 
            m_match = {
              type = 0, 
              status = 0, 
              matchres = 0, 
              sflags = 0, 
              match_level = 0, 
              position = 0, 
              num_siblings = 0, 
              num_children = 0, 
              immediate_parent_found = 0 '\000', 
              get_last = 0 '\000', 
              extra_options = Subdoc::Match::GET_MATCH_ONLY, 
              unique_item_found = 0 '\000', 
              loc_deepest = {
                at = 0x0, 
                length = 0
              }, 
              loc_key = {
                at = 0x0, 
                length = 0
              }, 
              ensure_unique = {
                at = 0x0, 
                length = 0
              }
            }, 
            m_optype = {
              code = 0 '\000'
            }, 
            m_doc = {
              at = 0x0, 
              length = 0
            }, 
            m_userval = {
              at = 0x0, 
              length = 0
            }, 
            m_result = 0x0
          }, 
          validator = {
            instance = {
              state = 5, 
              stack = {
                <std::stack<JSON_checker::Modes, std::deque<JSON_checker::Modes, std::allocator<JSON_checker::Modes> > >> = {
                  c = {
                    <std::_Deque_base<JSON_checker::Modes, std::allocator<JSON_checker::Modes> >> = {
                      _M_impl = {
                        <std::allocator<JSON_checker::Modes>> = {
                          <__gnu_cxx::new_allocator<JSON_checker::Modes>> = {<No data fields>}, <No data fields>}, 
                        <std::_Deque_base<JSON_checker::Modes, std::allocator<JSON_checker::Modes> >::_Deque_impl_data> = {
                          _M_map = 0x7fe241f07e40, 
                          _M_map_size = 8, 
                          _M_start = {
                            _M_cur = 0x7fe243034800, 
                            _M_first = 0x7fe243034800, 
                            _M_last = 0x7fe243034a00, 
                            _M_node = 0x7fe241f07e58
                          }, 
                          _M_finish = {
                            _M_cur = 0x7fe243034801, 
                            _M_first = 0x7fe243034800, 
                            _M_last = 0x7fe243034a00, 
                            _M_node = 0x7fe241f07e58
                          }
                        }, <No data fields>}
                    }, <No data fields>}
                }, <No data fields>}
            }
          }, 
          running = {
            _M_base = {
              static _S_alignment = 1, 
              _M_i = true
            }, 
            static is_always_lock_free = true
          }, 
          scratch_buffer = {
            _M_elems = '\000' <repeats 2047 times>
          }, 
          shutdown_next_log = 0, 
          new_conn_queue = {
            connections = {
              <folly::SynchronizedBase<folly::Synchronized<std::vector<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >, std::mutex>, (folly::detail::MutexLevel)0>> = {<No data fields>}, 
              members of folly::Synchronized<std::vector<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >, std::mutex>: 
              static nxCopyCtor = <optimized out>, 
              static nxMoveCtor = <optimized out>, 
              datum_ = {
                <std::_Vector_base<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >> = {
                  _M_impl = {
                    <std::allocator<FrontEndThread::ConnectionQueue::Entry>> = {
                      <__gnu_cxx::new_allocator<FrontEndThread::ConnectionQueue::Entry>> = {<No data fields>}, <No data fields>}, 
                    <std::_Vector_base<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >::_Vector_impl_data> = {
                      _M_start = 0x0, 
                      _M_finish = 0x0, 
                      _M_end_of_storage = 0x0
                    }, <No data fields>}
                }, <No data fields>}, 
              mutex_ = {
                <std::__mutex_base> = {
                  _M_mutex = {
                    __data = {
                      __lock = 0, 
                      __count = 0, 
                      __owner = 0, 
                      __nusers = 0, 
                      __kind = 0, 
                      __spins = 0, 
                      __elision = 0, 
                      __list = {
                        __prev = 0x0, 
                        __next = 0x0
                      }
                    }, 
                    __size = '\000' <repeats 39 times>, 
                    __align = 0
                  }
                }, <No data fields>}
            }
          }
        }
#7  0x0000000000ba43f9 in run (this=0x7fe241eb3990) at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:51
No locals.
#8  platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:64
No locals.
#9  0x00007fe245e85ea5 in start_thread (arg=0x7fe2367fc700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe2367fc700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609553680128, 3016376877879321588, 0, 8392704, 0, 140609553680128, -3019595154056879116, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#10 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 15 (Thread 0x7fe236ffd700 (LWP 84468)):
#0  0x00007fe2437c6eb3 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fe24515a3c5 in epoll_dispatch (base=0x7fe241ec3800, tv=<optimized out>) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/epoll.c:465
        epollop = 0x7fe241f19e20
        events = 0x7fe24301fe00
        i = <optimized out>
        res = <optimized out>
        timeout = <optimized out>
        __func__ = "epoll_dispatch"
#2  0x00007fe245151376 in event_base_loop (base=0x7fe241ec3800, flags=1) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/event.c:1998
        evsel = 0x7fe245364c20 <epollops>
        tv = {
          tv_sec = 48, 
          tv_usec = 140609745959712
        }
        tv_p = <optimized out>
        res = <optimized out>
        done = 0
        retval = 0
        __func__ = "event_base_loop"
#3  0x0000000000c186f7 in folly::EventBase::loopBody (this=this@entry=0x7fe241f5bb20, flags=flags@entry=0, ignoreKeepAlive=ignoreKeepAlive@entry=false)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:397
        callbacks = {
          <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
            static constant_time_size = false, 
            static stateful_value_traits = <optimized out>, 
            static has_container_from_iterator = <optimized out>, 
            static safemode_or_autounlink = true, 
            data_ = {
              <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                static link_mode = boost::intrusive::auto_unlink
              }, 
              members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
              root_plus_size_ = {
                <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                  static constant_time_size = <optimized out>
                }, 
                members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                m_header = {
                  <boost::intrusive::list_node<void*>> = {
                    next_ = 0x7fe236feb620, 
                    prev_ = 0x7fe236feb620
                  }, <No data fields>}
              }
            }
          }, <No data fields>}
        message = 0xce1548 "Your code just tried to loop over an event base from inside another event base loop. Since libevent is not reentrant, this leads to undefined behavior in opt builds. Please fix immediately. For the co"...
        SCOPE_EXIT_STATE13 = {
          <folly::detail::ScopeGuardImplBase> = {
            dismissed_ = false
          }, 
          members of folly::detail::ScopeGuardImpl<folly::EventBase::loopBody(int, bool)::<lambda()>, true>: 
          function_ = {
            __this = 0x7fe241f5bb20
          }
        }
        res = 0
        ranLoopCallbacks = <optimized out>
        blocking = true
        once = false
        prev = {
          __d = {
            __r = 9751039117435796
          }
        }
        idleStart = {
          __d = {
            __r = 9770378900317084
          }
        }
        busy = <optimized out>
        idle = <optimized out>
        prevLoopThread = {
          _M_thread = 0
        }
#4  0x0000000000c18bc6 in folly::EventBase::loop (this=this@entry=0x7fe241f5bb20) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:315
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xce11bb "EventBase", 
                e_ = 0xce11c4 ""
              }
            }
          }
        }
#5  0x0000000000c1a586 in folly::EventBase::loopForever (this=this@entry=0x7fe241f5bb20) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:538
        ret = <optimized out>
#6  0x00000000005b0339 in worker_libevent (arg=0x7fe241f5bb10) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/daemon/thread.cc:115
        me = @0x7fe241f5bb10: {
          thread_id = 140609562072832, 
          eventBase = {
            <folly::TimeoutManager> = {
              _vptr.TimeoutManager = 0x1091d68 <vtable for folly::EventBase+24>, 
              cobTimeouts_ = {
                _M_t = {
                  _M_t = {
                    <std::_Tuple_impl<0, folly::TimeoutManager::CobTimeouts*, std::default_delete<folly::TimeoutManager::CobTimeouts> >> = {
                      <std::_Tuple_impl<1, std::default_delete<folly::TimeoutManager::CobTimeouts> >> = {
                        <std::_Head_base<1, std::default_delete<folly::TimeoutManager::CobTimeouts>, true>> = {
                          <std::default_delete<folly::TimeoutManager::CobTimeouts>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                      <std::_Head_base<0, folly::TimeoutManager::CobTimeouts*, false>> = {
                        _M_head_impl = 0x7fe243026540
                      }, <No data fields>}, <No data fields>}
                }
              }
            }, 
            <folly::DrivableExecutor> = {
              <folly::Executor> = {
                _vptr.Executor = 0x1091e28 <vtable for folly::EventBase+216>, 
                static LO_PRI = -128 '\200', 
                static MID_PRI = 0 '\000', 
                static HI_PRI = 127 '\177'
              }, <No data fields>}, 
            <folly::IOExecutor> = {<No data fields>}, 
            <folly::SequencedExecutor> = {<No data fields>}, 
            <folly::ScheduledExecutor> = {<No data fields>}, 
            members of folly::EventBase: 
            intervalDuration_ = {
              __r = 10
            }, 
            wheelTimer_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::HHWheelTimerBase<std::chrono::duration<long, std::ratio<1, 1000> > >*, folly::DelayedDestruction::Destructor>> = {
                    <std::_Tuple_impl<1, folly::DelayedDestruction::Destructor>> = {
                      <std::_Head_base<1, folly::DelayedDestruction::Destructor, true>> = {
                        <folly::DelayedDestruction::Destructor> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::HHWheelTimerBase<std::chrono::duration<long, std::ratio<1, 1000> > >*, false>> = {
                      _M_head_impl = 0x0
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            loopCallbacks_ = {
              <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
                static constant_time_size = false, 
                static stateful_value_traits = <optimized out>, 
                static has_container_from_iterator = <optimized out>, 
                static safemode_or_autounlink = true, 
                data_ = {
                  <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                    <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                    members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                    static link_mode = boost::intrusive::auto_unlink
                  }, 
                  members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
                  root_plus_size_ = {
                    <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                      static constant_time_size = <optimized out>
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                    m_header = {
                      <boost::intrusive::list_node<void*>> = {
                        next_ = 0x7fe241f5bb60, 
                        prev_ = 0x7fe241f5bb60
                      }, <No data fields>}
                  }
                }
              }, <No data fields>}, 
            runBeforeLoopCallbacks_ = {
              <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
                static constant_time_size = false, 
                static stateful_value_traits = <optimized out>, 
                static has_container_from_iterator = <optimized out>, 
                static safemode_or_autounlink = true, 
                data_ = {
                  <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                    <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                    members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                    static link_mode = boost::intrusive::auto_unlink
                  }, 
                  members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
                  root_plus_size_ = {
                    <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                      static constant_time_size = <optimized out>
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                    m_header = {
                      <boost::intrusive::list_node<void*>> = {
                        next_ = 0x7fe241f5bb70, 
                        prev_ = 0x7fe241f5bb70
                      }, <No data fields>}
                  }
                }
              }, <No data fields>}, 
            onDestructionCallbacks_ = {
              <folly::SynchronizedBase<folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >, (folly::detail::MutexLevel)2>> = {
                <folly::SynchronizedBase<folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >, (folly::detail::MutexLevel)1>> = {<No data fields>}, <No data fields>}, 
              members of folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >: 
              static nxCopyCtor = <error reading variable: No global symbol "folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >::nxCopyCtor".>, 
              static nxMoveCtor = <error reading variable: No global symbol "folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >::nxMoveCtor".>, 
              datum_ = {
                <boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>> = {
                  static constant_time_size = true, 
                  static stateful_value_traits = <optimized out>, 
                  static has_container_from_iterator = <optimized out>, 
                  static safemode_or_autounlink = false, 
                  data_ = {
                    <boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>> = {
                      static link_mode = boost::intrusive::normal_link
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>::data_t: 
                    root_plus_size_ = {
                      <boost::intrusive::detail::size_holder<true, unsigned long, void>> = {
                        static constant_time_size = <optimized out>, 
                        size_ = 0
                      }, 
                      members of boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>::root_plus_size: 
                      m_header = {
                        <boost::intrusive::list_node<void*>> = {
                          next_ = 0x7fe241f5bb88, 
                          prev_ = 0x7fe241f5bb88
                        }, <No data fields>}
                    }
                  }
                }, <No data fields>}, 
              mutex_ = {
                static kReaderPriority = false, 
                state_ = {
                  <std::__atomic_base<unsigned int>> = {
                    static _S_alignment = 4, 
                    _M_i = 0
                  }, 
                  members of std::atomic<unsigned int>: 
                  static is_always_lock_free = true
                }, 
                static kIncrHasS = 2048, 
                static kHasS = 4294965248, 
                static kAnnotationCreated = 1024, 
                static kMayDefer = 512, 
                static kPrevDefer = 256, 
                static kHasE = 128, 
                static kBegunE = 64, 
                static kHasU = 32, 
                static kHasSolo = 224, 
                static kWaitingNotS = 16, 
                static kWaitingESingle = 4, 
                static kWaitingEMultiple = 8, 
                static kWaitingE = 12, 
                static kWaitingU = 2, 
                static kWaitingS = 1, 
                static kWaitingAny = 31, 
                static kNumSharedToStartDeferring = 2, 
                static kMaxSpinCount = 1000, 
                static kMaxSoftYieldCount = 1000, 
                static kDeferredSearchDistance = 2, 
                static kDeferredSeparationFactor = 4, 
                static kTokenStackTLSCapacity = 2, 
                static kTokenless = 1, 
                static tls_lastTokenlessSlot = 3, 
                static tls_lastDeferredReaderSlot = 3, 
                static deferredReaders = {{
                    <std::__atomic_base<unsigned long>> = {
                      static _S_alignment = 8, 
                      _M_i = 0
                    }, 
                    members of std::atomic<unsigned long>: 
                    static is_always_lock_free = true
                  } <repeats 2048 times>}
              }
            }, 
            runOnceCallbacks_ = 0x0, 
            stop_ = {
              _M_base = {
                static _S_alignment = 1, 
                _M_i = false
              }, 
              static is_always_lock_free = true
            }, 
            loopThread_ = {
              static _S_min_alignment = 8, 
              static _S_alignment = 8, 
              _M_i = {
                _M_thread = 140609562072832
              }, 
              static is_always_lock_free = <error reading variable: No global symbol "std::atomic<std::thread::id>::is_always_lock_free".>
            }, 
            queue_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::NotificationQueue<folly::Function<void()> >*, std::default_delete<folly::NotificationQueue<folly::Function<void()> > > >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::NotificationQueue<folly::Function<void()> > > >> = {
                      <std::_Head_base<1, std::default_delete<folly::NotificationQueue<folly::Function<void()> > >, true>> = {
                        <std::default_delete<folly::NotificationQueue<folly::Function<void()> > >> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::NotificationQueue<folly::Function<void()> >*, false>> = {
                      _M_head_impl = 0x7fe241f07d80
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            fnRunner_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::EventBase::FunctionRunner*, std::default_delete<folly::EventBase::FunctionRunner> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::EventBase::FunctionRunner> >> = {
                      <std::_Head_base<1, std::default_delete<folly::EventBase::FunctionRunner>, true>> = {
                        <std::default_delete<folly::EventBase::FunctionRunner>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::EventBase::FunctionRunner*, false>> = {
                      _M_head_impl = 0x7fe243035000
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            loopKeepAliveCount_ = 1, 
            loopKeepAliveCountAtomic_ = {
              <std::__atomic_base<long>> = {
                static _S_alignment = 8, 
                _M_i = 0
              }, 
              members of std::atomic<long>: 
              static is_always_lock_free = true
            }, 
            loopKeepAliveActive_ = true, 
            maxLatency_ = {
              __r = 0
            }, 
            avgLoopTime_ = {
              expCoeff_ = -4.9999999999999998e-07, 
              value_ = 32.565907218108293, 
              buffer_time_ = {
                __r = 4041
              }, 
              busy_buffer_ = {
                __r = 27
              }, 
              buffer_cnt_ = 10, 
              static buffer_interval_ = {
                __r = 10
              }
            }, 
            maxLatencyLoopTime_ = {
              expCoeff_ = -4.9999999999999998e-07, 
              value_ = 32.565907218108293, 
              buffer_time_ = {
                __r = 4041
              }, 
              busy_buffer_ = {
                __r = 27
              }, 
              buffer_cnt_ = 10, 
              static buffer_interval_ = {
                __r = 10
              }
            }, 
            maxLatencyCob_ = {
              <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
              members of folly::Function<void()>: 
              data_ = {
                big = 0x0, 
                tiny = {
                  __data = '\000' <repeats 47 times>, 
                  __align = {<No data fields>}
                }
              }, 
              call_ = 0x4664dd <folly::detail::function::FunctionTraits<void ()>::uninitCall(folly::detail::function::Data&)>, 
              exec_ = 0x0
            }, 
            enableTimeMeasurement_ = true, 
            nextLoopCnt_ = 8048547, 
            latestLoopCnt_ = 8048546, 
            startWork_ = {
              __d = {
                __r = 9770378900316049
              }
            }, 
            invokingLoop_ = true, 
            observer_ = {
              <std::__shared_ptr<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2>> = {
                <std::__shared_ptr_access<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                members of std::__shared_ptr<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2>: 
                _M_ptr = 0x0, 
                _M_refcount = {
                  _M_pi = 0x0
                }
              }, <No data fields>}, 
            observerSampleCount_ = 0, 
            executionObserver_ = 0x0, 
            name_ = {
              static npos = 18446744073709551615, 
              _M_dataplus = {
                <std::allocator<char>> = {
                  <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                _M_p = 0x7fe241f5bcd8 ""
              }, 
              _M_string_length = 0, 
              {
                _M_local_buf = '\000' <repeats 15 times>, 
                _M_allocated_capacity = 0
              }
            }, 
            localStorage_ = {
              _M_h = {
                <std::__detail::_Hashtable_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<false, false, true> >> = {
                  <std::__detail::_Hash_code_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::__detail::_Select1st, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, false>> = {
                    <std::__detail::_Hashtable_ebo_helper<0, std::__detail::_Select1st, true>> = {
                      <std::__detail::_Select1st> = {<No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<1, std::hash<unsigned long>, true>> = {
                      <std::hash<unsigned long>> = {
                        <std::__hash_base<unsigned long, unsigned long>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<2, std::__detail::_Mod_range_hashing, true>> = {
                      <std::__detail::_Mod_range_hashing> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                  <std::__detail::_Hashtable_ebo_helper<0, std::equal_to<unsigned long>, true>> = {
                    <std::equal_to<unsigned long>> = {
                      <std::binary_function<unsigned long, unsigned long, bool>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                <std::__detail::_Map_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, true>> = {<No data fields>}, 
                <std::__detail::_Insert<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, false>> = {
                  <std::__detail::_Insert_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >> = {<No data fields>}, <No data fields>}, 
                <std::__detail::_Rehash_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, std::integral_constant<bool, true> >> = {<No data fields>}, 
                <std::__detail::_Equality<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, true>> = {<No data fields>}, 
                <std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> > >> = {
                  <std::__detail::_Hashtable_ebo_helper<0, std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >, true>> = {
                    <std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >> = {
                      <__gnu_cxx::new_allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                members of std::_Hashtable<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >: 
                _M_buckets = 0x7fe241f5bd18, 
                _M_bucket_count = 1, 
                _M_before_begin = {
                  _M_nxt = 0x0
                }, 
                _M_element_count = 0, 
                _M_rehash_policy = {
                  static _S_growth_factor = 2, 
                  _M_max_load_factor = 1, 
                  _M_next_resize = 0
                }, 
                _M_single_bucket = 0x0
              }
            }, 
            localStorageToDtor_ = {
              _M_h = {
                <std::__detail::_Hashtable_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<false, true, true> >> = {
                  <std::__detail::_Hash_code_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::__detail::_Identity, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, false>> = {
                    <std::__detail::_Hashtable_ebo_helper<0, std::__detail::_Identity, true>> = {
                      <std::__detail::_Identity> = {<No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<1, std::hash<folly::detail::EventBaseLocalBaseBase*>, true>> = {
                      <std::hash<folly::detail::EventBaseLocalBaseBase*>> = {
                        <std::__hash_base<unsigned long, folly::detail::EventBaseLocalBaseBase*>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<2, std::__detail::_Mod_range_hashing, true>> = {
                      <std::__detail::_Mod_range_hashing> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                  <std::__detail::_Hashtable_ebo_helper<0, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, true>> = {
                    <std::equal_to<folly::detail::EventBaseLocalBaseBase*>> = {
                      <std::binary_function<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, bool>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                <std::__detail::_Map_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {<No data fields>}, 
                <std::__detail::_Insert<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {
                  <std::__detail::_Insert_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true> >> = {<No data fields>}, <No data fields>}, 
                <std::__detail::_Rehash_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, std::integral_constant<bool, true> >> = {<No data fields>}, 
                <std::__detail::_Equality<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {<No data fields>}, 
                <std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> > >> = {
                  <std::__detail::_Hashtable_ebo_helper<0, std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >, true>> = {
                    <std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >> = {
                      <__gnu_cxx::new_allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                members of std::_Hashtable<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true> >: 
                _M_buckets = 0x7fe241f5bd50, 
                _M_bucket_count = 1, 
                _M_before_begin = {
                  _M_nxt = 0x0
                }, 
                _M_element_count = 0, 
                _M_rehash_policy = {
                  static _S_growth_factor = 2, 
                  _M_max_load_factor = 1, 
                  _M_next_resize = 0
                }, 
                _M_single_bucket = 0x0
              }
            }, 
            virtualEventBaseInitFlag_ = {
              called_ = {
                _M_base = {
                  static _S_alignment = 1, 
                  _M_i = false
                }, 
                static is_always_lock_free = true
              }, 
              mutex_ = {
                static kReaderPriority = false, 
                state_ = {
                  <std::__atomic_base<unsigned int>> = {
                    static _S_alignment = 4, 
                    _M_i = 0
                  }, 
                  members of std::atomic<unsigned int>: 
                  static is_always_lock_free = true
                }, 
                static kIncrHasS = 2048, 
                static kHasS = 4294965248, 
                static kAnnotationCreated = 1024, 
                static kMayDefer = 512, 
                static kPrevDefer = 256, 
                static kHasE = 128, 
                static kBegunE = 64, 
                static kHasU = 32, 
                static kHasSolo = 224, 
                static kWaitingNotS = 16, 
                static kWaitingESingle = 4, 
                static kWaitingEMultiple = 8, 
                static kWaitingE = 12, 
                static kWaitingU = 2, 
                static kWaitingS = 1, 
                static kWaitingAny = 31, 
                static kNumSharedToStartDeferring = 2, 
                static kMaxSpinCount = 1000, 
                static kMaxSoftYieldCount = 1000, 
                static kDeferredSearchDistance = 2, 
                static kDeferredSeparationFactor = 4, 
                static kTokenStackTLSCapacity = 2, 
                static kTokenless = 1, 
                static tls_lastTokenlessSlot = 3, 
                static tls_lastDeferredReaderSlot = 3, 
                static deferredReaders = {{
                    <std::__atomic_base<unsigned long>> = {
                      static _S_alignment = 8, 
                      _M_i = 0
                    }, 
                    members of std::atomic<unsigned long>: 
                    static is_always_lock_free = true
                  } <repeats 2048 times>}
              }
            }, 
            virtualEventBase_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::VirtualEventBase*, std::default_delete<folly::VirtualEventBase> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::VirtualEventBase> >> = {
                      <std::_Head_base<1, std::default_delete<folly::VirtualEventBase>, true>> = {
                        <std::default_delete<folly::VirtualEventBase>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::VirtualEventBase*, false>> = {
                      _M_head_impl = 0x0
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            evb_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::EventBaseBackendBase*, std::default_delete<folly::EventBaseBackendBase> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::EventBaseBackendBase> >> = {
                      <std::_Head_base<1, std::default_delete<folly::EventBaseBackendBase>, true>> = {
                        <std::default_delete<folly::EventBaseBackendBase>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::EventBaseBackendBase*, false>> = {
                      _M_head_impl = 0x7fe243026550
                    }, <No data fields>}, <No data fields>}
              }
            }
          }, 
          mutex = {
            <std::__mutex_base> = {
              _M_mutex = {
                __data = {
                  __lock = 0, 
                  __count = 0, 
                  __owner = 0, 
                  __nusers = 0, 
                  __kind = 0, 
                  __spins = 0, 
                  __elision = 0, 
                  __list = {
                    __prev = 0x0, 
                    __next = 0x0
                  }
                }, 
                __size = '\000' <repeats 39 times>, 
                __align = 0
              }
            }, <No data fields>}, 
          index = 5, 
          subdoc_op = {
            m_path = 0x7fe241f4de00, 
            m_jsn = 0x143ff80, 
            m_match = {
              type = 0, 
              status = 0, 
              matchres = 0, 
              sflags = 0, 
              match_level = 0, 
              position = 0, 
              num_siblings = 0, 
              num_children = 0, 
              immediate_parent_found = 0 '\000', 
              get_last = 0 '\000', 
              extra_options = Subdoc::Match::GET_MATCH_ONLY, 
              unique_item_found = 0 '\000', 
              loc_deepest = {
                at = 0x0, 
                length = 0
              }, 
              loc_key = {
                at = 0x0, 
                length = 0
              }, 
              ensure_unique = {
                at = 0x0, 
                length = 0
              }
            }, 
            m_optype = {
              code = 0 '\000'
            }, 
            m_doc = {
              at = 0x0, 
              length = 0
            }, 
            m_userval = {
              at = 0x0, 
              length = 0
            }, 
            m_result = 0x0
          }, 
          validator = {
            instance = {
              state = 5, 
              stack = {
                <std::stack<JSON_checker::Modes, std::deque<JSON_checker::Modes, std::allocator<JSON_checker::Modes> > >> = {
                  c = {
                    <std::_Deque_base<JSON_checker::Modes, std::allocator<JSON_checker::Modes> >> = {
                      _M_impl = {
                        <std::allocator<JSON_checker::Modes>> = {
                          <__gnu_cxx::new_allocator<JSON_checker::Modes>> = {<No data fields>}, <No data fields>}, 
                        <std::_Deque_base<JSON_checker::Modes, std::allocator<JSON_checker::Modes> >::_Deque_impl_data> = {
                          _M_map = 0x7fe241f07dc0, 
                          _M_map_size = 8, 
                          _M_start = {
                            _M_cur = 0x7fe243034400, 
                            _M_first = 0x7fe243034400, 
                            _M_last = 0x7fe243034600, 
                            _M_node = 0x7fe241f07dd8
                          }, 
                          _M_finish = {
                            _M_cur = 0x7fe243034401, 
                            _M_first = 0x7fe243034400, 
                            _M_last = 0x7fe243034600, 
                            _M_node = 0x7fe241f07dd8
                          }
                        }, <No data fields>}
                    }, <No data fields>}
                }, <No data fields>}
            }
          }, 
          running = {
            _M_base = {
              static _S_alignment = 1, 
              _M_i = true
            }, 
            static is_always_lock_free = true
          }, 
          scratch_buffer = {
            _M_elems = '\000' <repeats 2047 times>
          }, 
          shutdown_next_log = 0, 
          new_conn_queue = {
            connections = {
              <folly::SynchronizedBase<folly::Synchronized<std::vector<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >, std::mutex>, (folly::detail::MutexLevel)0>> = {<No data fields>}, 
              members of folly::Synchronized<std::vector<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >, std::mutex>: 
              static nxCopyCtor = <optimized out>, 
              static nxMoveCtor = <optimized out>, 
              datum_ = {
                <std::_Vector_base<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >> = {
                  _M_impl = {
                    <std::allocator<FrontEndThread::ConnectionQueue::Entry>> = {
                      <__gnu_cxx::new_allocator<FrontEndThread::ConnectionQueue::Entry>> = {<No data fields>}, <No data fields>}, 
                    <std::_Vector_base<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >::_Vector_impl_data> = {
                      _M_start = 0x0, 
                      _M_finish = 0x0, 
                      _M_end_of_storage = 0x0
                    }, <No data fields>}
                }, <No data fields>}, 
              mutex_ = {
                <std::__mutex_base> = {
                  _M_mutex = {
                    __data = {
                      __lock = 0, 
                      __count = 0, 
                      __owner = 0, 
                      __nusers = 0, 
                      __kind = 0, 
                      __spins = 0, 
                      __elision = 0, 
                      __list = {
                        __prev = 0x0, 
                        __next = 0x0
                      }
                    }, 
                    __size = '\000' <repeats 39 times>, 
                    __align = 0
                  }
                }, <No data fields>}
            }
          }
        }
#7  0x0000000000ba43f9 in run (this=0x7fe241eb3960) at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:51
No locals.
#8  platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:64
No locals.
#9  0x00007fe245e85ea5 in start_thread (arg=0x7fe236ffd700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe236ffd700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609562072832, 3016376877879321588, 0, 8392704, 0, 140609562072832, -3019594055082122252, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#10 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 14 (Thread 0x7fe2377fe700 (LWP 84467)):
#0  0x00007fe2437c6eb3 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fe24515a3c5 in epoll_dispatch (base=0x7fe241ec3500, tv=<optimized out>) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/epoll.c:465
        epollop = 0x7fe241f19e80
        events = 0x7fe24301fc80
        i = <optimized out>
        res = <optimized out>
        timeout = <optimized out>
        __func__ = "epoll_dispatch"
#2  0x00007fe245151376 in event_base_loop (base=0x7fe241ec3500, flags=1) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/event.c:1998
        evsel = 0x7fe245364c20 <epollops>
        tv = {
          tv_sec = 48, 
          tv_usec = 140609745956688
        }
        tv_p = <optimized out>
        res = <optimized out>
        done = 0
        retval = 0
        __func__ = "event_base_loop"
#3  0x0000000000c186f7 in folly::EventBase::loopBody (this=this@entry=0x7fe241f5af50, flags=flags@entry=0, ignoreKeepAlive=ignoreKeepAlive@entry=false)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:397
        callbacks = {
          <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
            static constant_time_size = false, 
            static stateful_value_traits = <optimized out>, 
            static has_container_from_iterator = <optimized out>, 
            static safemode_or_autounlink = true, 
            data_ = {
              <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                static link_mode = boost::intrusive::auto_unlink
              }, 
              members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
              root_plus_size_ = {
                <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                  static constant_time_size = <optimized out>
                }, 
                members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                m_header = {
                  <boost::intrusive::list_node<void*>> = {
                    next_ = 0x7fe2377ec620, 
                    prev_ = 0x7fe2377ec620
                  }, <No data fields>}
              }
            }
          }, <No data fields>}
        message = 0xce1548 "Your code just tried to loop over an event base from inside another event base loop. Since libevent is not reentrant, this leads to undefined behavior in opt builds. Please fix immediately. For the co"...
        SCOPE_EXIT_STATE13 = {
          <folly::detail::ScopeGuardImplBase> = {
            dismissed_ = false
          }, 
          members of folly::detail::ScopeGuardImpl<folly::EventBase::loopBody(int, bool)::<lambda()>, true>: 
          function_ = {
            __this = 0x7fe241f5af50
          }
        }
        res = 0
        ranLoopCallbacks = <optimized out>
        blocking = true
        once = false
        prev = {
          __d = {
            __r = 9751039117335636
          }
        }
        idleStart = {
          __d = {
            __r = 9770378915493635
          }
        }
        busy = <optimized out>
        idle = <optimized out>
        prevLoopThread = {
          _M_thread = 0
        }
#4  0x0000000000c18bc6 in folly::EventBase::loop (this=this@entry=0x7fe241f5af50) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:315
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xce11bb "EventBase", 
                e_ = 0xce11c4 ""
              }
            }
          }
        }
#5  0x0000000000c1a586 in folly::EventBase::loopForever (this=this@entry=0x7fe241f5af50) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:538
        ret = <optimized out>
#6  0x00000000005b0339 in worker_libevent (arg=0x7fe241f5af40) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/daemon/thread.cc:115
        me = @0x7fe241f5af40: {
          thread_id = 140609570465536, 
          eventBase = {
            <folly::TimeoutManager> = {
              _vptr.TimeoutManager = 0x1091d68 <vtable for folly::EventBase+24>, 
              cobTimeouts_ = {
                _M_t = {
                  _M_t = {
                    <std::_Tuple_impl<0, folly::TimeoutManager::CobTimeouts*, std::default_delete<folly::TimeoutManager::CobTimeouts> >> = {
                      <std::_Tuple_impl<1, std::default_delete<folly::TimeoutManager::CobTimeouts> >> = {
                        <std::_Head_base<1, std::default_delete<folly::TimeoutManager::CobTimeouts>, true>> = {
                          <std::default_delete<folly::TimeoutManager::CobTimeouts>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                      <std::_Head_base<0, folly::TimeoutManager::CobTimeouts*, false>> = {
                        _M_head_impl = 0x7fe2430264f0
                      }, <No data fields>}, <No data fields>}
                }
              }
            }, 
            <folly::DrivableExecutor> = {
              <folly::Executor> = {
                _vptr.Executor = 0x1091e28 <vtable for folly::EventBase+216>, 
                static LO_PRI = -128 '\200', 
                static MID_PRI = 0 '\000', 
                static HI_PRI = 127 '\177'
              }, <No data fields>}, 
            <folly::IOExecutor> = {<No data fields>}, 
            <folly::SequencedExecutor> = {<No data fields>}, 
            <folly::ScheduledExecutor> = {<No data fields>}, 
            members of folly::EventBase: 
            intervalDuration_ = {
              __r = 10
            }, 
            wheelTimer_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::HHWheelTimerBase<std::chrono::duration<long, std::ratio<1, 1000> > >*, folly::DelayedDestruction::Destructor>> = {
                    <std::_Tuple_impl<1, folly::DelayedDestruction::Destructor>> = {
                      <std::_Head_base<1, folly::DelayedDestruction::Destructor, true>> = {
                        <folly::DelayedDestruction::Destructor> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::HHWheelTimerBase<std::chrono::duration<long, std::ratio<1, 1000> > >*, false>> = {
                      _M_head_impl = 0x0
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            loopCallbacks_ = {
              <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
                static constant_time_size = false, 
                static stateful_value_traits = <optimized out>, 
                static has_container_from_iterator = <optimized out>, 
                static safemode_or_autounlink = true, 
                data_ = {
                  <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                    <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                    members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                    static link_mode = boost::intrusive::auto_unlink
                  }, 
                  members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
                  root_plus_size_ = {
                    <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                      static constant_time_size = <optimized out>
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                    m_header = {
                      <boost::intrusive::list_node<void*>> = {
                        next_ = 0x7fe241f5af90, 
                        prev_ = 0x7fe241f5af90
                      }, <No data fields>}
                  }
                }
              }, <No data fields>}, 
            runBeforeLoopCallbacks_ = {
              <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
                static constant_time_size = false, 
                static stateful_value_traits = <optimized out>, 
                static has_container_from_iterator = <optimized out>, 
                static safemode_or_autounlink = true, 
                data_ = {
                  <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                    <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                    members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                    static link_mode = boost::intrusive::auto_unlink
                  }, 
                  members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
                  root_plus_size_ = {
                    <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                      static constant_time_size = <optimized out>
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                    m_header = {
                      <boost::intrusive::list_node<void*>> = {
                        next_ = 0x7fe241f5afa0, 
                        prev_ = 0x7fe241f5afa0
                      }, <No data fields>}
                  }
                }
              }, <No data fields>}, 
            onDestructionCallbacks_ = {
              <folly::SynchronizedBase<folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >, (folly::detail::MutexLevel)2>> = {
                <folly::SynchronizedBase<folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >, (folly::detail::MutexLevel)1>> = {<No data fields>}, <No data fields>}, 
              members of folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >: 
              static nxCopyCtor = <error reading variable: No global symbol "folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >::nxCopyCtor".>, 
              static nxMoveCtor = <error reading variable: No global symbol "folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >::nxMoveCtor".>, 
              datum_ = {
                <boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>> = {
                  static constant_time_size = true, 
                  static stateful_value_traits = <optimized out>, 
                  static has_container_from_iterator = <optimized out>, 
                  static safemode_or_autounlink = false, 
                  data_ = {
                    <boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>> = {
                      static link_mode = boost::intrusive::normal_link
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>::data_t: 
                    root_plus_size_ = {
                      <boost::intrusive::detail::size_holder<true, unsigned long, void>> = {
                        static constant_time_size = <optimized out>, 
                        size_ = 0
                      }, 
                      members of boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>::root_plus_size: 
                      m_header = {
                        <boost::intrusive::list_node<void*>> = {
                          next_ = 0x7fe241f5afb8, 
                          prev_ = 0x7fe241f5afb8
                        }, <No data fields>}
                    }
                  }
                }, <No data fields>}, 
              mutex_ = {
                static kReaderPriority = false, 
                state_ = {
                  <std::__atomic_base<unsigned int>> = {
                    static _S_alignment = 4, 
                    _M_i = 0
                  }, 
                  members of std::atomic<unsigned int>: 
                  static is_always_lock_free = true
                }, 
                static kIncrHasS = 2048, 
                static kHasS = 4294965248, 
                static kAnnotationCreated = 1024, 
                static kMayDefer = 512, 
                static kPrevDefer = 256, 
                static kHasE = 128, 
                static kBegunE = 64, 
                static kHasU = 32, 
                static kHasSolo = 224, 
                static kWaitingNotS = 16, 
                static kWaitingESingle = 4, 
                static kWaitingEMultiple = 8, 
                static kWaitingE = 12, 
                static kWaitingU = 2, 
                static kWaitingS = 1, 
                static kWaitingAny = 31, 
                static kNumSharedToStartDeferring = 2, 
                static kMaxSpinCount = 1000, 
                static kMaxSoftYieldCount = 1000, 
                static kDeferredSearchDistance = 2, 
                static kDeferredSeparationFactor = 4, 
                static kTokenStackTLSCapacity = 2, 
                static kTokenless = 1, 
                static tls_lastTokenlessSlot = 6, 
                static tls_lastDeferredReaderSlot = 6, 
                static deferredReaders = {{
                    <std::__atomic_base<unsigned long>> = {
                      static _S_alignment = 8, 
                      _M_i = 0
                    }, 
                    members of std::atomic<unsigned long>: 
                    static is_always_lock_free = true
                  } <repeats 2048 times>}
              }
            }, 
            runOnceCallbacks_ = 0x0, 
            stop_ = {
              _M_base = {
                static _S_alignment = 1, 
                _M_i = false
              }, 
              static is_always_lock_free = true
            }, 
            loopThread_ = {
              static _S_min_alignment = 8, 
              static _S_alignment = 8, 
              _M_i = {
                _M_thread = 140609570465536
              }, 
              static is_always_lock_free = <error reading variable: No global symbol "std::atomic<std::thread::id>::is_always_lock_free".>
            }, 
            queue_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::NotificationQueue<folly::Function<void()> >*, std::default_delete<folly::NotificationQueue<folly::Function<void()> > > >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::NotificationQueue<folly::Function<void()> > > >> = {
                      <std::_Head_base<1, std::default_delete<folly::NotificationQueue<folly::Function<void()> > >, true>> = {
                        <std::default_delete<folly::NotificationQueue<folly::Function<void()> > >> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::NotificationQueue<folly::Function<void()> >*, false>> = {
                      _M_head_impl = 0x7fe241f07d00
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            fnRunner_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::EventBase::FunctionRunner*, std::default_delete<folly::EventBase::FunctionRunner> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::EventBase::FunctionRunner> >> = {
                      <std::_Head_base<1, std::default_delete<folly::EventBase::FunctionRunner>, true>> = {
                        <std::default_delete<folly::EventBase::FunctionRunner>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::EventBase::FunctionRunner*, false>> = {
                      _M_head_impl = 0x7fe24305cf00
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            loopKeepAliveCount_ = 1, 
            loopKeepAliveCountAtomic_ = {
              <std::__atomic_base<long>> = {
                static _S_alignment = 8, 
                _M_i = 0
              }, 
              members of std::atomic<long>: 
              static is_always_lock_free = true
            }, 
            loopKeepAliveActive_ = true, 
            maxLatency_ = {
              __r = 0
            }, 
            avgLoopTime_ = {
              expCoeff_ = -4.9999999999999998e-07, 
              value_ = 33.743572152446923, 
              buffer_time_ = {
                __r = 2054
              }, 
              busy_buffer_ = {
                __r = 21
              }, 
              buffer_cnt_ = 10, 
              static buffer_interval_ = {
                __r = 10
              }
            }, 
            maxLatencyLoopTime_ = {
              expCoeff_ = -4.9999999999999998e-07, 
              value_ = 33.743572152446923, 
              buffer_time_ = {
                __r = 2054
              }, 
              busy_buffer_ = {
                __r = 21
              }, 
              buffer_cnt_ = 10, 
              static buffer_interval_ = {
                __r = 10
              }
            }, 
            maxLatencyCob_ = {
              <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
              members of folly::Function<void()>: 
              data_ = {
                big = 0x0, 
                tiny = {
                  __data = '\000' <repeats 47 times>, 
                  __align = {<No data fields>}
                }
              }, 
              call_ = 0x4664dd <folly::detail::function::FunctionTraits<void ()>::uninitCall(folly::detail::function::Data&)>, 
              exec_ = 0x0
            }, 
            enableTimeMeasurement_ = true, 
            nextLoopCnt_ = 8047333, 
            latestLoopCnt_ = 8047332, 
            startWork_ = {
              __d = {
                __r = 9770378915492501
              }
            }, 
            invokingLoop_ = true, 
            observer_ = {
              <std::__shared_ptr<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2>> = {
                <std::__shared_ptr_access<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                members of std::__shared_ptr<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2>: 
                _M_ptr = 0x0, 
                _M_refcount = {
                  _M_pi = 0x0
                }
              }, <No data fields>}, 
            observerSampleCount_ = 0, 
            executionObserver_ = 0x0, 
            name_ = {
              static npos = 18446744073709551615, 
              _M_dataplus = {
                <std::allocator<char>> = {
                  <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                _M_p = 0x7fe241f5b108 ""
              }, 
              _M_string_length = 0, 
              {
                _M_local_buf = '\000' <repeats 15 times>, 
                _M_allocated_capacity = 0
              }
            }, 
            localStorage_ = {
              _M_h = {
                <std::__detail::_Hashtable_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<false, false, true> >> = {
                  <std::__detail::_Hash_code_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::__detail::_Select1st, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, false>> = {
                    <std::__detail::_Hashtable_ebo_helper<0, std::__detail::_Select1st, true>> = {
                      <std::__detail::_Select1st> = {<No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<1, std::hash<unsigned long>, true>> = {
                      <std::hash<unsigned long>> = {
                        <std::__hash_base<unsigned long, unsigned long>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<2, std::__detail::_Mod_range_hashing, true>> = {
                      <std::__detail::_Mod_range_hashing> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                  <std::__detail::_Hashtable_ebo_helper<0, std::equal_to<unsigned long>, true>> = {
                    <std::equal_to<unsigned long>> = {
                      <std::binary_function<unsigned long, unsigned long, bool>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                <std::__detail::_Map_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, true>> = {<No data fields>}, 
                <std::__detail::_Insert<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, false>> = {
                  <std::__detail::_Insert_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >> = {<No data fields>}, <No data fields>}, 
                <std::__detail::_Rehash_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, std::integral_constant<bool, true> >> = {<No data fields>}, 
                <std::__detail::_Equality<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, true>> = {<No data fields>}, 
                <std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> > >> = {
                  <std::__detail::_Hashtable_ebo_helper<0, std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >, true>> = {
                    <std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >> = {
                      <__gnu_cxx::new_allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                members of std::_Hashtable<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >: 
                _M_buckets = 0x7fe241f5b148, 
                _M_bucket_count = 1, 
                _M_before_begin = {
                  _M_nxt = 0x0
                }, 
                _M_element_count = 0, 
                _M_rehash_policy = {
                  static _S_growth_factor = 2, 
                  _M_max_load_factor = 1, 
                  _M_next_resize = 0
                }, 
                _M_single_bucket = 0x0
              }
            }, 
            localStorageToDtor_ = {
              _M_h = {
                <std::__detail::_Hashtable_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<false, true, true> >> = {
                  <std::__detail::_Hash_code_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::__detail::_Identity, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, false>> = {
                    <std::__detail::_Hashtable_ebo_helper<0, std::__detail::_Identity, true>> = {
                      <std::__detail::_Identity> = {<No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<1, std::hash<folly::detail::EventBaseLocalBaseBase*>, true>> = {
                      <std::hash<folly::detail::EventBaseLocalBaseBase*>> = {
                        <std::__hash_base<unsigned long, folly::detail::EventBaseLocalBaseBase*>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<2, std::__detail::_Mod_range_hashing, true>> = {
                      <std::__detail::_Mod_range_hashing> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                  <std::__detail::_Hashtable_ebo_helper<0, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, true>> = {
                    <std::equal_to<folly::detail::EventBaseLocalBaseBase*>> = {
                      <std::binary_function<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, bool>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                <std::__detail::_Map_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {<No data fields>}, 
                <std::__detail::_Insert<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {
                  <std::__detail::_Insert_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true> >> = {<No data fields>}, <No data fields>}, 
                <std::__detail::_Rehash_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, std::integral_constant<bool, true> >> = {<No data fields>}, 
                <std::__detail::_Equality<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {<No data fields>}, 
                <std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> > >> = {
                  <std::__detail::_Hashtable_ebo_helper<0, std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >, true>> = {
                    <std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >> = {
                      <__gnu_cxx::new_allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                members of std::_Hashtable<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true> >: 
                _M_buckets = 0x7fe241f5b180, 
                _M_bucket_count = 1, 
                _M_before_begin = {
                  _M_nxt = 0x0
                }, 
                _M_element_count = 0, 
                _M_rehash_policy = {
                  static _S_growth_factor = 2, 
                  _M_max_load_factor = 1, 
                  _M_next_resize = 0
                }, 
                _M_single_bucket = 0x0
              }
            }, 
            virtualEventBaseInitFlag_ = {
              called_ = {
                _M_base = {
                  static _S_alignment = 1, 
                  _M_i = false
                }, 
                static is_always_lock_free = true
              }, 
              mutex_ = {
                static kReaderPriority = false, 
                state_ = {
                  <std::__atomic_base<unsigned int>> = {
                    static _S_alignment = 4, 
                    _M_i = 0
                  }, 
                  members of std::atomic<unsigned int>: 
                  static is_always_lock_free = true
                }, 
                static kIncrHasS = 2048, 
                static kHasS = 4294965248, 
                static kAnnotationCreated = 1024, 
                static kMayDefer = 512, 
                static kPrevDefer = 256, 
                static kHasE = 128, 
                static kBegunE = 64, 
                static kHasU = 32, 
                static kHasSolo = 224, 
                static kWaitingNotS = 16, 
                static kWaitingESingle = 4, 
                static kWaitingEMultiple = 8, 
                static kWaitingE = 12, 
                static kWaitingU = 2, 
                static kWaitingS = 1, 
                static kWaitingAny = 31, 
                static kNumSharedToStartDeferring = 2, 
                static kMaxSpinCount = 1000, 
                static kMaxSoftYieldCount = 1000, 
                static kDeferredSearchDistance = 2, 
                static kDeferredSeparationFactor = 4, 
                static kTokenStackTLSCapacity = 2, 
                static kTokenless = 1, 
                static tls_lastTokenlessSlot = 6, 
                static tls_lastDeferredReaderSlot = 6, 
                static deferredReaders = {{
                    <std::__atomic_base<unsigned long>> = {
                      static _S_alignment = 8, 
                      _M_i = 0
                    }, 
                    members of std::atomic<unsigned long>: 
                    static is_always_lock_free = true
                  } <repeats 2048 times>}
              }
            }, 
            virtualEventBase_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::VirtualEventBase*, std::default_delete<folly::VirtualEventBase> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::VirtualEventBase> >> = {
                      <std::_Head_base<1, std::default_delete<folly::VirtualEventBase>, true>> = {
                        <std::default_delete<folly::VirtualEventBase>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::VirtualEventBase*, false>> = {
                      _M_head_impl = 0x0
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            evb_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::EventBaseBackendBase*, std::default_delete<folly::EventBaseBackendBase> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::EventBaseBackendBase> >> = {
                      <std::_Head_base<1, std::default_delete<folly::EventBaseBackendBase>, true>> = {
                        <std::default_delete<folly::EventBaseBackendBase>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::EventBaseBackendBase*, false>> = {
                      _M_head_impl = 0x7fe243026500
                    }, <No data fields>}, <No data fields>}
              }
            }
          }, 
          mutex = {
            <std::__mutex_base> = {
              _M_mutex = {
                __data = {
                  __lock = 0, 
                  __count = 0, 
                  __owner = 0, 
                  __nusers = 0, 
                  __kind = 0, 
                  __spins = 0, 
                  __elision = 0, 
                  __list = {
                    __prev = 0x0, 
                    __next = 0x0
                  }
                }, 
                __size = '\000' <repeats 39 times>, 
                __align = 0
              }
            }, <No data fields>}, 
          index = 4, 
          subdoc_op = {
            m_path = 0x7fe241f4d900, 
            m_jsn = 0x143f7a0, 
            m_match = {
              type = 0, 
              status = 0, 
              matchres = 0, 
              sflags = 0, 
              match_level = 0, 
              position = 0, 
              num_siblings = 0, 
              num_children = 0, 
              immediate_parent_found = 0 '\000', 
              get_last = 0 '\000', 
              extra_options = Subdoc::Match::GET_MATCH_ONLY, 
              unique_item_found = 0 '\000', 
              loc_deepest = {
                at = 0x0, 
                length = 0
              }, 
              loc_key = {
                at = 0x0, 
                length = 0
              }, 
              ensure_unique = {
                at = 0x0, 
                length = 0
              }
            }, 
            m_optype = {
              code = 0 '\000'
            }, 
            m_doc = {
              at = 0x0, 
              length = 0
            }, 
            m_userval = {
              at = 0x0, 
              length = 0
            }, 
            m_result = 0x0
          }, 
          validator = {
            instance = {
              state = 5, 
              stack = {
                <std::stack<JSON_checker::Modes, std::deque<JSON_checker::Modes, std::allocator<JSON_checker::Modes> > >> = {
                  c = {
                    <std::_Deque_base<JSON_checker::Modes, std::allocator<JSON_checker::Modes> >> = {
                      _M_impl = {
                        <std::allocator<JSON_checker::Modes>> = {
                          <__gnu_cxx::new_allocator<JSON_checker::Modes>> = {<No data fields>}, <No data fields>}, 
                        <std::_Deque_base<JSON_checker::Modes, std::allocator<JSON_checker::Modes> >::_Deque_impl_data> = {
                          _M_map = 0x7fe241f07d40, 
                          _M_map_size = 8, 
                          _M_start = {
                            _M_cur = 0x7fe243034000, 
                            _M_first = 0x7fe243034000, 
                            _M_last = 0x7fe243034200, 
                            _M_node = 0x7fe241f07d58
                          }, 
                          _M_finish = {
                            _M_cur = 0x7fe243034001, 
                            _M_first = 0x7fe243034000, 
                            _M_last = 0x7fe243034200, 
                            _M_node = 0x7fe241f07d58
                          }
                        }, <No data fields>}
                    }, <No data fields>}
                }, <No data fields>}
            }
          }, 
          running = {
            _M_base = {
              static _S_alignment = 1, 
              _M_i = true
            }, 
            static is_always_lock_free = true
          }, 
          scratch_buffer = {
            _M_elems = '\000' <repeats 2047 times>
          }, 
          shutdown_next_log = 0, 
          new_conn_queue = {
            connections = {
              <folly::SynchronizedBase<folly::Synchronized<std::vector<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >, std::mutex>, (folly::detail::MutexLevel)0>> = {<No data fields>}, 
              members of folly::Synchronized<std::vector<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >, std::mutex>: 
              static nxCopyCtor = <optimized out>, 
              static nxMoveCtor = <optimized out>, 
              datum_ = {
                <std::_Vector_base<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >> = {
                  _M_impl = {
                    <std::allocator<FrontEndThread::ConnectionQueue::Entry>> = {
                      <__gnu_cxx::new_allocator<FrontEndThread::ConnectionQueue::Entry>> = {<No data fields>}, <No data fields>}, 
                    <std::_Vector_base<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >::_Vector_impl_data> = {
                      _M_start = 0x0, 
                      _M_finish = 0x0, 
                      _M_end_of_storage = 0x0
                    }, <No data fields>}
                }, <No data fields>}, 
              mutex_ = {
                <std::__mutex_base> = {
                  _M_mutex = {
                    __data = {
                      __lock = 0, 
                      __count = 0, 
                      __owner = 0, 
                      __nusers = 0, 
                      __kind = 0, 
                      __spins = 0, 
                      __elision = 0, 
                      __list = {
                        __prev = 0x0, 
                        __next = 0x0
                      }
                    }, 
                    __size = '\000' <repeats 39 times>, 
                    __align = 0
                  }
                }, <No data fields>}
            }
          }
        }
#7  0x0000000000ba43f9 in run (this=0x7fe241eb39c0) at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:51
No locals.
#8  platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:64
No locals.
#9  0x00007fe245e85ea5 in start_thread (arg=0x7fe2377fe700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe2377fe700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609570465536, 3016376877879321588, 0, 8392704, 0, 140609570465536, -3019597354153876492, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#10 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 13 (Thread 0x7fe237fff700 (LWP 84466)):
#0  0x00007fe2437c6eb3 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fe24515a3c5 in epoll_dispatch (base=0x7fe241ec3200, tv=<optimized out>) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/epoll.c:465
        epollop = 0x7fe241f19fc0
        events = 0x7fe24301fb00
        i = <optimized out>
        res = <optimized out>
        timeout = <optimized out>
        __func__ = "epoll_dispatch"
#2  0x00007fe245151376 in event_base_loop (base=0x7fe241ec3200, flags=1) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/event.c:1998
        evsel = 0x7fe245364c20 <epollops>
        tv = {
          tv_sec = 48, 
          tv_usec = 140609745953664
        }
        tv_p = <optimized out>
        res = <optimized out>
        done = 0
        retval = 0
        __func__ = "event_base_loop"
#3  0x0000000000c186f7 in folly::EventBase::loopBody (this=this@entry=0x7fe241f5a380, flags=flags@entry=0, ignoreKeepAlive=ignoreKeepAlive@entry=false)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:397
        callbacks = {
          <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
            static constant_time_size = false, 
            static stateful_value_traits = <optimized out>, 
            static has_container_from_iterator = <optimized out>, 
            static safemode_or_autounlink = true, 
            data_ = {
              <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                static link_mode = boost::intrusive::auto_unlink
              }, 
              members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
              root_plus_size_ = {
                <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                  static constant_time_size = <optimized out>
                }, 
                members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                m_header = {
                  <boost::intrusive::list_node<void*>> = {
                    next_ = 0x7fe237fed620, 
                    prev_ = 0x7fe237fed620
                  }, <No data fields>}
              }
            }
          }, <No data fields>}
        message = 0xce1548 "Your code just tried to loop over an event base from inside another event base loop. Since libevent is not reentrant, this leads to undefined behavior in opt builds. Please fix immediately. For the co"...
        SCOPE_EXIT_STATE13 = {
          <folly::detail::ScopeGuardImplBase> = {
            dismissed_ = false
          }, 
          members of folly::detail::ScopeGuardImpl<folly::EventBase::loopBody(int, bool)::<lambda()>, true>: 
          function_ = {
            __this = 0x7fe241f5a380
          }
        }
        res = 0
        ranLoopCallbacks = <optimized out>
        blocking = true
        once = false
        prev = {
          __d = {
            __r = 9751039117254266
          }
        }
        idleStart = {
          __d = {
            __r = 9770378911815636
          }
        }
        busy = <optimized out>
        idle = <optimized out>
        prevLoopThread = {
          _M_thread = 0
        }
#4  0x0000000000c18bc6 in folly::EventBase::loop (this=this@entry=0x7fe241f5a380) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:315
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xce11bb "EventBase", 
                e_ = 0xce11c4 ""
              }
            }
          }
        }
#5  0x0000000000c1a586 in folly::EventBase::loopForever (this=this@entry=0x7fe241f5a380) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:538
        ret = <optimized out>
#6  0x00000000005b0339 in worker_libevent (arg=0x7fe241f5a370) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/daemon/thread.cc:115
        me = @0x7fe241f5a370: {
          thread_id = 140609578858240, 
          eventBase = {
            <folly::TimeoutManager> = {
              _vptr.TimeoutManager = 0x1091d68 <vtable for folly::EventBase+24>, 
              cobTimeouts_ = {
                _M_t = {
                  _M_t = {
                    <std::_Tuple_impl<0, folly::TimeoutManager::CobTimeouts*, std::default_delete<folly::TimeoutManager::CobTimeouts> >> = {
                      <std::_Tuple_impl<1, std::default_delete<folly::TimeoutManager::CobTimeouts> >> = {
                        <std::_Head_base<1, std::default_delete<folly::TimeoutManager::CobTimeouts>, true>> = {
                          <std::default_delete<folly::TimeoutManager::CobTimeouts>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                      <std::_Head_base<0, folly::TimeoutManager::CobTimeouts*, false>> = {
                        _M_head_impl = 0x7fe2430264a0
                      }, <No data fields>}, <No data fields>}
                }
              }
            }, 
            <folly::DrivableExecutor> = {
              <folly::Executor> = {
                _vptr.Executor = 0x1091e28 <vtable for folly::EventBase+216>, 
                static LO_PRI = -128 '\200', 
                static MID_PRI = 0 '\000', 
                static HI_PRI = 127 '\177'
              }, <No data fields>}, 
            <folly::IOExecutor> = {<No data fields>}, 
            <folly::SequencedExecutor> = {<No data fields>}, 
            <folly::ScheduledExecutor> = {<No data fields>}, 
            members of folly::EventBase: 
            intervalDuration_ = {
              __r = 10
            }, 
            wheelTimer_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::HHWheelTimerBase<std::chrono::duration<long, std::ratio<1, 1000> > >*, folly::DelayedDestruction::Destructor>> = {
                    <std::_Tuple_impl<1, folly::DelayedDestruction::Destructor>> = {
                      <std::_Head_base<1, folly::DelayedDestruction::Destructor, true>> = {
                        <folly::DelayedDestruction::Destructor> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::HHWheelTimerBase<std::chrono::duration<long, std::ratio<1, 1000> > >*, false>> = {
                      _M_head_impl = 0x0
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            loopCallbacks_ = {
              <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
                static constant_time_size = false, 
                static stateful_value_traits = <optimized out>, 
                static has_container_from_iterator = <optimized out>, 
                static safemode_or_autounlink = true, 
                data_ = {
                  <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                    <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                    members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                    static link_mode = boost::intrusive::auto_unlink
                  }, 
                  members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
                  root_plus_size_ = {
                    <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                      static constant_time_size = <optimized out>
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                    m_header = {
                      <boost::intrusive::list_node<void*>> = {
                        next_ = 0x7fe241f5a3c0, 
                        prev_ = 0x7fe241f5a3c0
                      }, <No data fields>}
                  }
                }
              }, <No data fields>}, 
            runBeforeLoopCallbacks_ = {
              <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
                static constant_time_size = false, 
                static stateful_value_traits = <optimized out>, 
                static has_container_from_iterator = <optimized out>, 
                static safemode_or_autounlink = true, 
                data_ = {
                  <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                    <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                    members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                    static link_mode = boost::intrusive::auto_unlink
                  }, 
                  members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
                  root_plus_size_ = {
                    <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                      static constant_time_size = <optimized out>
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                    m_header = {
                      <boost::intrusive::list_node<void*>> = {
                        next_ = 0x7fe241f5a3d0, 
                        prev_ = 0x7fe241f5a3d0
                      }, <No data fields>}
                  }
                }
              }, <No data fields>}, 
            onDestructionCallbacks_ = {
              <folly::SynchronizedBase<folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >, (folly::detail::MutexLevel)2>> = {
                <folly::SynchronizedBase<folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >, (folly::detail::MutexLevel)1>> = {<No data fields>}, <No data fields>}, 
              members of folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >: 
              static nxCopyCtor = <error reading variable: No global symbol "folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >::nxCopyCtor".>, 
              static nxMoveCtor = <error reading variable: No global symbol "folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >::nxMoveCtor".>, 
              datum_ = {
                <boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>> = {
                  static constant_time_size = true, 
                  static stateful_value_traits = <optimized out>, 
                  static has_container_from_iterator = <optimized out>, 
                  static safemode_or_autounlink = false, 
                  data_ = {
                    <boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>> = {
                      static link_mode = boost::intrusive::normal_link
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>::data_t: 
                    root_plus_size_ = {
                      <boost::intrusive::detail::size_holder<true, unsigned long, void>> = {
                        static constant_time_size = <optimized out>, 
                        size_ = 0
                      }, 
                      members of boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>::root_plus_size: 
                      m_header = {
                        <boost::intrusive::list_node<void*>> = {
                          next_ = 0x7fe241f5a3e8, 
                          prev_ = 0x7fe241f5a3e8
                        }, <No data fields>}
                    }
                  }
                }, <No data fields>}, 
              mutex_ = {
                static kReaderPriority = false, 
                state_ = {
                  <std::__atomic_base<unsigned int>> = {
                    static _S_alignment = 4, 
                    _M_i = 0
                  }, 
                  members of std::atomic<unsigned int>: 
                  static is_always_lock_free = true
                }, 
                static kIncrHasS = 2048, 
                static kHasS = 4294965248, 
                static kAnnotationCreated = 1024, 
                static kMayDefer = 512, 
                static kPrevDefer = 256, 
                static kHasE = 128, 
                static kBegunE = 64, 
                static kHasU = 32, 
                static kHasSolo = 224, 
                static kWaitingNotS = 16, 
                static kWaitingESingle = 4, 
                static kWaitingEMultiple = 8, 
                static kWaitingE = 12, 
                static kWaitingU = 2, 
                static kWaitingS = 1, 
                static kWaitingAny = 31, 
                static kNumSharedToStartDeferring = 2, 
                static kMaxSpinCount = 1000, 
                static kMaxSoftYieldCount = 1000, 
                static kDeferredSearchDistance = 2, 
                static kDeferredSeparationFactor = 4, 
                static kTokenStackTLSCapacity = 2, 
                static kTokenless = 1, 
                static tls_lastTokenlessSlot = 4, 
                static tls_lastDeferredReaderSlot = 4, 
                static deferredReaders = {{
                    <std::__atomic_base<unsigned long>> = {
                      static _S_alignment = 8, 
                      _M_i = 0
                    }, 
                    members of std::atomic<unsigned long>: 
                    static is_always_lock_free = true
                  } <repeats 2048 times>}
              }
            }, 
            runOnceCallbacks_ = 0x0, 
            stop_ = {
              _M_base = {
                static _S_alignment = 1, 
                _M_i = false
              }, 
              static is_always_lock_free = true
            }, 
            loopThread_ = {
              static _S_min_alignment = 8, 
              static _S_alignment = 8, 
              _M_i = {
                _M_thread = 140609578858240
              }, 
              static is_always_lock_free = <error reading variable: No global symbol "std::atomic<std::thread::id>::is_always_lock_free".>
            }, 
            queue_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::NotificationQueue<folly::Function<void()> >*, std::default_delete<folly::NotificationQueue<folly::Function<void()> > > >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::NotificationQueue<folly::Function<void()> > > >> = {
                      <std::_Head_base<1, std::default_delete<folly::NotificationQueue<folly::Function<void()> > >, true>> = {
                        <std::default_delete<folly::NotificationQueue<folly::Function<void()> > >> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::NotificationQueue<folly::Function<void()> >*, false>> = {
                      _M_head_impl = 0x7fe241f07c80
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            fnRunner_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::EventBase::FunctionRunner*, std::default_delete<folly::EventBase::FunctionRunner> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::EventBase::FunctionRunner> >> = {
                      <std::_Head_base<1, std::default_delete<folly::EventBase::FunctionRunner>, true>> = {
                        <std::default_delete<folly::EventBase::FunctionRunner>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::EventBase::FunctionRunner*, false>> = {
                      _M_head_impl = 0x7fe24305ce00
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            loopKeepAliveCount_ = 1, 
            loopKeepAliveCountAtomic_ = {
              <std::__atomic_base<long>> = {
                static _S_alignment = 8, 
                _M_i = 0
              }, 
              members of std::atomic<long>: 
              static is_always_lock_free = true
            }, 
            loopKeepAliveActive_ = true, 
            maxLatency_ = {
              __r = 0
            }, 
            avgLoopTime_ = {
              expCoeff_ = -4.9999999999999998e-07, 
              value_ = 32.951018204792646, 
              buffer_time_ = {
                __r = 2228
              }, 
              busy_buffer_ = {
                __r = 22
              }, 
              buffer_cnt_ = 10, 
              static buffer_interval_ = {
                __r = 10
              }
            }, 
            maxLatencyLoopTime_ = {
              expCoeff_ = -4.9999999999999998e-07, 
              value_ = 32.951018204792646, 
              buffer_time_ = {
                __r = 2228
              }, 
              busy_buffer_ = {
                __r = 22
              }, 
              buffer_cnt_ = 10, 
              static buffer_interval_ = {
                __r = 10
              }
            }, 
            maxLatencyCob_ = {
              <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
              members of folly::Function<void()>: 
              data_ = {
                big = 0x0, 
                tiny = {
                  __data = '\000' <repeats 47 times>, 
                  __align = {<No data fields>}
                }
              }, 
              call_ = 0x4664dd <folly::detail::function::FunctionTraits<void ()>::uninitCall(folly::detail::function::Data&)>, 
              exec_ = 0x0
            }, 
            enableTimeMeasurement_ = true, 
            nextLoopCnt_ = 8053742, 
            latestLoopCnt_ = 8053741, 
            startWork_ = {
              __d = {
                __r = 9770378911814602
              }
            }, 
            invokingLoop_ = true, 
            observer_ = {
              <std::__shared_ptr<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2>> = {
                <std::__shared_ptr_access<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                members of std::__shared_ptr<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2>: 
                _M_ptr = 0x0, 
                _M_refcount = {
                  _M_pi = 0x0
                }
              }, <No data fields>}, 
            observerSampleCount_ = 0, 
            executionObserver_ = 0x0, 
            name_ = {
              static npos = 18446744073709551615, 
              _M_dataplus = {
                <std::allocator<char>> = {
                  <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                _M_p = 0x7fe241f5a538 ""
              }, 
              _M_string_length = 0, 
              {
                _M_local_buf = '\000' <repeats 15 times>, 
                _M_allocated_capacity = 0
              }
            }, 
            localStorage_ = {
              _M_h = {
                <std::__detail::_Hashtable_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<false, false, true> >> = {
                  <std::__detail::_Hash_code_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::__detail::_Select1st, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, false>> = {
                    <std::__detail::_Hashtable_ebo_helper<0, std::__detail::_Select1st, true>> = {
                      <std::__detail::_Select1st> = {<No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<1, std::hash<unsigned long>, true>> = {
                      <std::hash<unsigned long>> = {
                        <std::__hash_base<unsigned long, unsigned long>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<2, std::__detail::_Mod_range_hashing, true>> = {
                      <std::__detail::_Mod_range_hashing> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                  <std::__detail::_Hashtable_ebo_helper<0, std::equal_to<unsigned long>, true>> = {
                    <std::equal_to<unsigned long>> = {
                      <std::binary_function<unsigned long, unsigned long, bool>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                <std::__detail::_Map_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, true>> = {<No data fields>}, 
                <std::__detail::_Insert<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, false>> = {
                  <std::__detail::_Insert_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >> = {<No data fields>}, <No data fields>}, 
                <std::__detail::_Rehash_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, std::integral_constant<bool, true> >> = {<No data fields>}, 
                <std::__detail::_Equality<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, true>> = {<No data fields>}, 
                <std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> > >> = {
                  <std::__detail::_Hashtable_ebo_helper<0, std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >, true>> = {
                    <std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >> = {
                      <__gnu_cxx::new_allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                members of std::_Hashtable<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >: 
                _M_buckets = 0x7fe241f5a578, 
                _M_bucket_count = 1, 
                _M_before_begin = {
                  _M_nxt = 0x0
                }, 
                _M_element_count = 0, 
                _M_rehash_policy = {
                  static _S_growth_factor = 2, 
                  _M_max_load_factor = 1, 
                  _M_next_resize = 0
                }, 
                _M_single_bucket = 0x0
              }
            }, 
            localStorageToDtor_ = {
              _M_h = {
                <std::__detail::_Hashtable_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<false, true, true> >> = {
                  <std::__detail::_Hash_code_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::__detail::_Identity, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, false>> = {
                    <std::__detail::_Hashtable_ebo_helper<0, std::__detail::_Identity, true>> = {
                      <std::__detail::_Identity> = {<No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<1, std::hash<folly::detail::EventBaseLocalBaseBase*>, true>> = {
                      <std::hash<folly::detail::EventBaseLocalBaseBase*>> = {
                        <std::__hash_base<unsigned long, folly::detail::EventBaseLocalBaseBase*>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<2, std::__detail::_Mod_range_hashing, true>> = {
                      <std::__detail::_Mod_range_hashing> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                  <std::__detail::_Hashtable_ebo_helper<0, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, true>> = {
                    <std::equal_to<folly::detail::EventBaseLocalBaseBase*>> = {
                      <std::binary_function<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, bool>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                <std::__detail::_Map_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {<No data fields>}, 
                <std::__detail::_Insert<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {
                  <std::__detail::_Insert_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true> >> = {<No data fields>}, <No data fields>}, 
                <std::__detail::_Rehash_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, std::integral_constant<bool, true> >> = {<No data fields>}, 
                <std::__detail::_Equality<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {<No data fields>}, 
                <std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> > >> = {
                  <std::__detail::_Hashtable_ebo_helper<0, std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >, true>> = {
                    <std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >> = {
                      <__gnu_cxx::new_allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                members of std::_Hashtable<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true> >: 
                _M_buckets = 0x7fe241f5a5b0, 
                _M_bucket_count = 1, 
                _M_before_begin = {
                  _M_nxt = 0x0
                }, 
                _M_element_count = 0, 
                _M_rehash_policy = {
                  static _S_growth_factor = 2, 
                  _M_max_load_factor = 1, 
                  _M_next_resize = 0
                }, 
                _M_single_bucket = 0x0
              }
            }, 
            virtualEventBaseInitFlag_ = {
              called_ = {
                _M_base = {
                  static _S_alignment = 1, 
                  _M_i = false
                }, 
                static is_always_lock_free = true
              }, 
              mutex_ = {
                static kReaderPriority = false, 
                state_ = {
                  <std::__atomic_base<unsigned int>> = {
                    static _S_alignment = 4, 
                    _M_i = 0
                  }, 
                  members of std::atomic<unsigned int>: 
                  static is_always_lock_free = true
                }, 
                static kIncrHasS = 2048, 
                static kHasS = 4294965248, 
                static kAnnotationCreated = 1024, 
                static kMayDefer = 512, 
                static kPrevDefer = 256, 
                static kHasE = 128, 
                static kBegunE = 64, 
                static kHasU = 32, 
                static kHasSolo = 224, 
                static kWaitingNotS = 16, 
                static kWaitingESingle = 4, 
                static kWaitingEMultiple = 8, 
                static kWaitingE = 12, 
                static kWaitingU = 2, 
                static kWaitingS = 1, 
                static kWaitingAny = 31, 
                static kNumSharedToStartDeferring = 2, 
                static kMaxSpinCount = 1000, 
                static kMaxSoftYieldCount = 1000, 
                static kDeferredSearchDistance = 2, 
                static kDeferredSeparationFactor = 4, 
                static kTokenStackTLSCapacity = 2, 
                static kTokenless = 1, 
                static tls_lastTokenlessSlot = 4, 
                static tls_lastDeferredReaderSlot = 4, 
                static deferredReaders = {{
                    <std::__atomic_base<unsigned long>> = {
                      static _S_alignment = 8, 
                      _M_i = 0
                    }, 
                    members of std::atomic<unsigned long>: 
                    static is_always_lock_free = true
                  } <repeats 2048 times>}
              }
            }, 
            virtualEventBase_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::VirtualEventBase*, std::default_delete<folly::VirtualEventBase> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::VirtualEventBase> >> = {
                      <std::_Head_base<1, std::default_delete<folly::VirtualEventBase>, true>> = {
                        <std::default_delete<folly::VirtualEventBase>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::VirtualEventBase*, false>> = {
                      _M_head_impl = 0x0
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            evb_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::EventBaseBackendBase*, std::default_delete<folly::EventBaseBackendBase> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::EventBaseBackendBase> >> = {
                      <std::_Head_base<1, std::default_delete<folly::EventBaseBackendBase>, true>> = {
                        <std::default_delete<folly::EventBaseBackendBase>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::EventBaseBackendBase*, false>> = {
                      _M_head_impl = 0x7fe2430264b0
                    }, <No data fields>}, <No data fields>}
              }
            }
          }, 
          mutex = {
            <std::__mutex_base> = {
              _M_mutex = {
                __data = {
                  __lock = 0, 
                  __count = 0, 
                  __owner = 0, 
                  __nusers = 0, 
                  __kind = 0, 
                  __spins = 0, 
                  __elision = 0, 
                  __list = {
                    __prev = 0x0, 
                    __next = 0x0
                  }
                }, 
                __size = '\000' <repeats 39 times>, 
                __align = 0
              }
            }, <No data fields>}, 
          index = 3, 
          subdoc_op = {
            m_path = 0x7fe241f4d400, 
            m_jsn = 0x143efc0, 
            m_match = {
              type = 0, 
              status = 0, 
              matchres = 0, 
              sflags = 0, 
              match_level = 0, 
              position = 0, 
              num_siblings = 0, 
              num_children = 0, 
              immediate_parent_found = 0 '\000', 
              get_last = 0 '\000', 
              extra_options = Subdoc::Match::GET_MATCH_ONLY, 
              unique_item_found = 0 '\000', 
              loc_deepest = {
                at = 0x0, 
                length = 0
              }, 
              loc_key = {
                at = 0x0, 
                length = 0
              }, 
              ensure_unique = {
                at = 0x0, 
                length = 0
              }
            }, 
            m_optype = {
              code = 0 '\000'
            }, 
            m_doc = {
              at = 0x0, 
              length = 0
            }, 
            m_userval = {
              at = 0x0, 
              length = 0
            }, 
            m_result = 0x0
          }, 
          validator = {
            instance = {
              state = 5, 
              stack = {
                <std::stack<JSON_checker::Modes, std::deque<JSON_checker::Modes, std::allocator<JSON_checker::Modes> > >> = {
                  c = {
                    <std::_Deque_base<JSON_checker::Modes, std::allocator<JSON_checker::Modes> >> = {
                      _M_impl = {
                        <std::allocator<JSON_checker::Modes>> = {
                          <__gnu_cxx::new_allocator<JSON_checker::Modes>> = {<No data fields>}, <No data fields>}, 
                        <std::_Deque_base<JSON_checker::Modes, std::allocator<JSON_checker::Modes> >::_Deque_impl_data> = {
                          _M_map = 0x7fe241f07cc0, 
                          _M_map_size = 8, 
                          _M_start = {
                            _M_cur = 0x7fe243041c00, 
                            _M_first = 0x7fe243041c00, 
                            _M_last = 0x7fe243041e00, 
                            _M_node = 0x7fe241f07cd8
                          }, 
                          _M_finish = {
                            _M_cur = 0x7fe243041c01, 
                            _M_first = 0x7fe243041c00, 
                            _M_last = 0x7fe243041e00, 
                            _M_node = 0x7fe241f07cd8
                          }
                        }, <No data fields>}
                    }, <No data fields>}
                }, <No data fields>}
            }
          }, 
          running = {
            _M_base = {
              static _S_alignment = 1, 
              _M_i = true
            }, 
            static is_always_lock_free = true
          }, 
          scratch_buffer = {
            _M_elems = '\000' <repeats 2047 times>
          }, 
          shutdown_next_log = 0, 
          new_conn_queue = {
            connections = {
              <folly::SynchronizedBase<folly::Synchronized<std::vector<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >, std::mutex>, (folly::detail::MutexLevel)0>> = {<No data fields>}, 
              members of folly::Synchronized<std::vector<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >, std::mutex>: 
              static nxCopyCtor = <optimized out>, 
              static nxMoveCtor = <optimized out>, 
              datum_ = {
                <std::_Vector_base<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >> = {
                  _M_impl = {
                    <std::allocator<FrontEndThread::ConnectionQueue::Entry>> = {
                      <__gnu_cxx::new_allocator<FrontEndThread::ConnectionQueue::Entry>> = {<No data fields>}, <No data fields>}, 
                    <std::_Vector_base<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >::_Vector_impl_data> = {
                      _M_start = 0x0, 
                      _M_finish = 0x0, 
                      _M_end_of_storage = 0x0
                    }, <No data fields>}
                }, <No data fields>}, 
              mutex_ = {
                <std::__mutex_base> = {
                  _M_mutex = {
                    __data = {
                      __lock = 0, 
                      __count = 0, 
                      __owner = 0, 
                      __nusers = 0, 
                      __kind = 0, 
                      __spins = 0, 
                      __elision = 0, 
                      __list = {
                        __prev = 0x0, 
                        __next = 0x0
                      }
                    }, 
                    __size = '\000' <repeats 39 times>, 
                    __align = 0
                  }
                }, <No data fields>}
            }
          }
        }
#7  0x0000000000ba43f9 in run (this=0x7fe241eb39f0) at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:51
No locals.
#8  platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:64
No locals.
#9  0x00007fe245e85ea5 in start_thread (arg=0x7fe237fff700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe237fff700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609578858240, 3016376877879321588, 0, 8392704, 0, 140609578858240, -3019596255179119628, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#10 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 12 (Thread 0x7fe23caf4700 (LWP 84465)):
#0  0x00007fe2437c6eb3 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fe24515a3c5 in epoll_dispatch (base=0x7fe241ec2f00, tv=<optimized out>) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/epoll.c:465
        epollop = 0x7fe241e86600
        events = 0x7fe24301f980
        i = <optimized out>
        res = <optimized out>
        timeout = <optimized out>
        __func__ = "epoll_dispatch"
#2  0x00007fe245151376 in event_base_loop (base=0x7fe241ec2f00, flags=1) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/event.c:1998
        evsel = 0x7fe245364c20 <epollops>
        tv = {
          tv_sec = 48, 
          tv_usec = 140609745950640
        }
        tv_p = <optimized out>
        res = <optimized out>
        done = 0
        retval = 0
        __func__ = "event_base_loop"
#3  0x0000000000c186f7 in folly::EventBase::loopBody (this=this@entry=0x7fe241f597b0, flags=flags@entry=0, ignoreKeepAlive=ignoreKeepAlive@entry=false)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:397
        callbacks = {
          <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
            static constant_time_size = false, 
            static stateful_value_traits = <optimized out>, 
            static has_container_from_iterator = <optimized out>, 
            static safemode_or_autounlink = true, 
            data_ = {
              <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                static link_mode = boost::intrusive::auto_unlink
              }, 
              members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
              root_plus_size_ = {
                <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                  static constant_time_size = <optimized out>
                }, 
                members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                m_header = {
                  <boost::intrusive::list_node<void*>> = {
                    next_ = 0x7fe23cae2620, 
                    prev_ = 0x7fe23cae2620
                  }, <No data fields>}
              }
            }
          }, <No data fields>}
        message = 0xce1548 "Your code just tried to loop over an event base from inside another event base loop. Since libevent is not reentrant, this leads to undefined behavior in opt builds. Please fix immediately. For the co"...
        SCOPE_EXIT_STATE13 = {
          <folly::detail::ScopeGuardImplBase> = {
            dismissed_ = false
          }, 
          members of folly::detail::ScopeGuardImpl<folly::EventBase::loopBody(int, bool)::<lambda()>, true>: 
          function_ = {
            __this = 0x7fe241f597b0
          }
        }
        res = 0
        ranLoopCallbacks = <optimized out>
        blocking = true
        once = false
        prev = {
          __d = {
            __r = 9751039117158455
          }
        }
        idleStart = {
          __d = {
            __r = 9770378909589505
          }
        }
        busy = <optimized out>
        idle = <optimized out>
        prevLoopThread = {
          _M_thread = 0
        }
#4  0x0000000000c18bc6 in folly::EventBase::loop (this=this@entry=0x7fe241f597b0) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:315
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xce11bb "EventBase", 
                e_ = 0xce11c4 ""
              }
            }
          }
        }
#5  0x0000000000c1a586 in folly::EventBase::loopForever (this=this@entry=0x7fe241f597b0) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:538
        ret = <optimized out>
#6  0x00000000005b0339 in worker_libevent (arg=0x7fe241f597a0) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/daemon/thread.cc:115
        me = @0x7fe241f597a0: {
          thread_id = 140609657456384, 
          eventBase = {
            <folly::TimeoutManager> = {
              _vptr.TimeoutManager = 0x1091d68 <vtable for folly::EventBase+24>, 
              cobTimeouts_ = {
                _M_t = {
                  _M_t = {
                    <std::_Tuple_impl<0, folly::TimeoutManager::CobTimeouts*, std::default_delete<folly::TimeoutManager::CobTimeouts> >> = {
                      <std::_Tuple_impl<1, std::default_delete<folly::TimeoutManager::CobTimeouts> >> = {
                        <std::_Head_base<1, std::default_delete<folly::TimeoutManager::CobTimeouts>, true>> = {
                          <std::default_delete<folly::TimeoutManager::CobTimeouts>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                      <std::_Head_base<0, folly::TimeoutManager::CobTimeouts*, false>> = {
                        _M_head_impl = 0x7fe243026590
                      }, <No data fields>}, <No data fields>}
                }
              }
            }, 
            <folly::DrivableExecutor> = {
              <folly::Executor> = {
                _vptr.Executor = 0x1091e28 <vtable for folly::EventBase+216>, 
                static LO_PRI = -128 '\200', 
                static MID_PRI = 0 '\000', 
                static HI_PRI = 127 '\177'
              }, <No data fields>}, 
            <folly::IOExecutor> = {<No data fields>}, 
            <folly::SequencedExecutor> = {<No data fields>}, 
            <folly::ScheduledExecutor> = {<No data fields>}, 
            members of folly::EventBase: 
            intervalDuration_ = {
              __r = 10
            }, 
            wheelTimer_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::HHWheelTimerBase<std::chrono::duration<long, std::ratio<1, 1000> > >*, folly::DelayedDestruction::Destructor>> = {
                    <std::_Tuple_impl<1, folly::DelayedDestruction::Destructor>> = {
                      <std::_Head_base<1, folly::DelayedDestruction::Destructor, true>> = {
                        <folly::DelayedDestruction::Destructor> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::HHWheelTimerBase<std::chrono::duration<long, std::ratio<1, 1000> > >*, false>> = {
                      _M_head_impl = 0x0
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            loopCallbacks_ = {
              <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
                static constant_time_size = false, 
                static stateful_value_traits = <optimized out>, 
                static has_container_from_iterator = <optimized out>, 
                static safemode_or_autounlink = true, 
                data_ = {
                  <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                    <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                    members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                    static link_mode = boost::intrusive::auto_unlink
                  }, 
                  members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
                  root_plus_size_ = {
                    <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                      static constant_time_size = <optimized out>
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                    m_header = {
                      <boost::intrusive::list_node<void*>> = {
                        next_ = 0x7fe241f597f0, 
                        prev_ = 0x7fe241f597f0
                      }, <No data fields>}
                  }
                }
              }, <No data fields>}, 
            runBeforeLoopCallbacks_ = {
              <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
                static constant_time_size = false, 
                static stateful_value_traits = <optimized out>, 
                static has_container_from_iterator = <optimized out>, 
                static safemode_or_autounlink = true, 
                data_ = {
                  <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                    <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                    members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                    static link_mode = boost::intrusive::auto_unlink
                  }, 
                  members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
                  root_plus_size_ = {
                    <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                      static constant_time_size = <optimized out>
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                    m_header = {
                      <boost::intrusive::list_node<void*>> = {
                        next_ = 0x7fe241f59800, 
                        prev_ = 0x7fe241f59800
                      }, <No data fields>}
                  }
                }
              }, <No data fields>}, 
            onDestructionCallbacks_ = {
              <folly::SynchronizedBase<folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >, (folly::detail::MutexLevel)2>> = {
                <folly::SynchronizedBase<folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >, (folly::detail::MutexLevel)1>> = {<No data fields>}, <No data fields>}, 
              members of folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >: 
              static nxCopyCtor = <error reading variable: No global symbol "folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >::nxCopyCtor".>, 
              static nxMoveCtor = <error reading variable: No global symbol "folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >::nxMoveCtor".>, 
              datum_ = {
                <boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>> = {
                  static constant_time_size = true, 
                  static stateful_value_traits = <optimized out>, 
                  static has_container_from_iterator = <optimized out>, 
                  static safemode_or_autounlink = false, 
                  data_ = {
                    <boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>> = {
                      static link_mode = boost::intrusive::normal_link
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>::data_t: 
                    root_plus_size_ = {
                      <boost::intrusive::detail::size_holder<true, unsigned long, void>> = {
                        static constant_time_size = <optimized out>, 
                        size_ = 0
                      }, 
                      members of boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>::root_plus_size: 
                      m_header = {
                        <boost::intrusive::list_node<void*>> = {
                          next_ = 0x7fe241f59818, 
                          prev_ = 0x7fe241f59818
                        }, <No data fields>}
                    }
                  }
                }, <No data fields>}, 
              mutex_ = {
                static kReaderPriority = false, 
                state_ = {
                  <std::__atomic_base<unsigned int>> = {
                    static _S_alignment = 4, 
                    _M_i = 0
                  }, 
                  members of std::atomic<unsigned int>: 
                  static is_always_lock_free = true
                }, 
                static kIncrHasS = 2048, 
                static kHasS = 4294965248, 
                static kAnnotationCreated = 1024, 
                static kMayDefer = 512, 
                static kPrevDefer = 256, 
                static kHasE = 128, 
                static kBegunE = 64, 
                static kHasU = 32, 
                static kHasSolo = 224, 
                static kWaitingNotS = 16, 
                static kWaitingESingle = 4, 
                static kWaitingEMultiple = 8, 
                static kWaitingE = 12, 
                static kWaitingU = 2, 
                static kWaitingS = 1, 
                static kWaitingAny = 31, 
                static kNumSharedToStartDeferring = 2, 
                static kMaxSpinCount = 1000, 
                static kMaxSoftYieldCount = 1000, 
                static kDeferredSearchDistance = 2, 
                static kDeferredSeparationFactor = 4, 
                static kTokenStackTLSCapacity = 2, 
                static kTokenless = 1, 
                static tls_lastTokenlessSlot = 7, 
                static tls_lastDeferredReaderSlot = 7, 
                static deferredReaders = {{
                    <std::__atomic_base<unsigned long>> = {
                      static _S_alignment = 8, 
                      _M_i = 0
                    }, 
                    members of std::atomic<unsigned long>: 
                    static is_always_lock_free = true
                  } <repeats 2048 times>}
              }
            }, 
            runOnceCallbacks_ = 0x0, 
            stop_ = {
              _M_base = {
                static _S_alignment = 1, 
                _M_i = false
              }, 
              static is_always_lock_free = true
            }, 
            loopThread_ = {
              static _S_min_alignment = 8, 
              static _S_alignment = 8, 
              _M_i = {
                _M_thread = 140609657456384
              }, 
              static is_always_lock_free = <error reading variable: No global symbol "std::atomic<std::thread::id>::is_always_lock_free".>
            }, 
            queue_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::NotificationQueue<folly::Function<void()> >*, std::default_delete<folly::NotificationQueue<folly::Function<void()> > > >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::NotificationQueue<folly::Function<void()> > > >> = {
                      <std::_Head_base<1, std::default_delete<folly::NotificationQueue<folly::Function<void()> > >, true>> = {
                        <std::default_delete<folly::NotificationQueue<folly::Function<void()> > >> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::NotificationQueue<folly::Function<void()> >*, false>> = {
                      _M_head_impl = 0x7fe241f07c00
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            fnRunner_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::EventBase::FunctionRunner*, std::default_delete<folly::EventBase::FunctionRunner> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::EventBase::FunctionRunner> >> = {
                      <std::_Head_base<1, std::default_delete<folly::EventBase::FunctionRunner>, true>> = {
                        <std::default_delete<folly::EventBase::FunctionRunner>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::EventBase::FunctionRunner*, false>> = {
                      _M_head_impl = 0x7fe24305cd00
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            loopKeepAliveCount_ = 1, 
            loopKeepAliveCountAtomic_ = {
              <std::__atomic_base<long>> = {
                static _S_alignment = 8, 
                _M_i = 0
              }, 
              members of std::atomic<long>: 
              static is_always_lock_free = true
            }, 
            loopKeepAliveActive_ = true, 
            maxLatency_ = {
              __r = 0
            }, 
            avgLoopTime_ = {
              expCoeff_ = -4.9999999999999998e-07, 
              value_ = 32.793761030049097, 
              buffer_time_ = {
                __r = 1516
              }, 
              busy_buffer_ = {
                __r = 2
              }, 
              buffer_cnt_ = 7, 
              static buffer_interval_ = {
                __r = 10
              }
            }, 
            maxLatencyLoopTime_ = {
              expCoeff_ = -4.9999999999999998e-07, 
              value_ = 32.793761030049097, 
              buffer_time_ = {
                __r = 1516
              }, 
              busy_buffer_ = {
                __r = 2
              }, 
              buffer_cnt_ = 7, 
              static buffer_interval_ = {
                __r = 10
              }
            }, 
            maxLatencyCob_ = {
              <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
              members of folly::Function<void()>: 
              data_ = {
                big = 0x0, 
                tiny = {
                  __data = '\000' <repeats 47 times>, 
                  __align = {<No data fields>}
                }
              }, 
              call_ = 0x4664dd <folly::detail::function::FunctionTraits<void ()>::uninitCall(folly::detail::function::Data&)>, 
              exec_ = 0x0
            }, 
            enableTimeMeasurement_ = true, 
            nextLoopCnt_ = 8050569, 
            latestLoopCnt_ = 8050568, 
            startWork_ = {
              __d = {
                __r = 9770378909588142
              }
            }, 
            invokingLoop_ = true, 
            observer_ = {
              <std::__shared_ptr<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2>> = {
                <std::__shared_ptr_access<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                members of std::__shared_ptr<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2>: 
                _M_ptr = 0x0, 
                _M_refcount = {
                  _M_pi = 0x0
                }
              }, <No data fields>}, 
            observerSampleCount_ = 0, 
            executionObserver_ = 0x0, 
            name_ = {
              static npos = 18446744073709551615, 
              _M_dataplus = {
                <std::allocator<char>> = {
                  <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                _M_p = 0x7fe241f59968 ""
              }, 
              _M_string_length = 0, 
              {
                _M_local_buf = '\000' <repeats 15 times>, 
                _M_allocated_capacity = 0
              }
            }, 
            localStorage_ = {
              _M_h = {
                <std::__detail::_Hashtable_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<false, false, true> >> = {
                  <std::__detail::_Hash_code_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::__detail::_Select1st, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, false>> = {
                    <std::__detail::_Hashtable_ebo_helper<0, std::__detail::_Select1st, true>> = {
                      <std::__detail::_Select1st> = {<No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<1, std::hash<unsigned long>, true>> = {
                      <std::hash<unsigned long>> = {
                        <std::__hash_base<unsigned long, unsigned long>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<2, std::__detail::_Mod_range_hashing, true>> = {
                      <std::__detail::_Mod_range_hashing> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                  <std::__detail::_Hashtable_ebo_helper<0, std::equal_to<unsigned long>, true>> = {
                    <std::equal_to<unsigned long>> = {
                      <std::binary_function<unsigned long, unsigned long, bool>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                <std::__detail::_Map_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, true>> = {<No data fields>}, 
                <std::__detail::_Insert<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, false>> = {
                  <std::__detail::_Insert_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >> = {<No data fields>}, <No data fields>}, 
                <std::__detail::_Rehash_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, std::integral_constant<bool, true> >> = {<No data fields>}, 
                <std::__detail::_Equality<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, true>> = {<No data fields>}, 
                <std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> > >> = {
                  <std::__detail::_Hashtable_ebo_helper<0, std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >, true>> = {
                    <std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >> = {
                      <__gnu_cxx::new_allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                members of std::_Hashtable<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >: 
                _M_buckets = 0x7fe241f599a8, 
                _M_bucket_count = 1, 
                _M_before_begin = {
                  _M_nxt = 0x0
                }, 
                _M_element_count = 0, 
                _M_rehash_policy = {
                  static _S_growth_factor = 2, 
                  _M_max_load_factor = 1, 
                  _M_next_resize = 0
                }, 
                _M_single_bucket = 0x0
              }
            }, 
            localStorageToDtor_ = {
              _M_h = {
                <std::__detail::_Hashtable_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<false, true, true> >> = {
                  <std::__detail::_Hash_code_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::__detail::_Identity, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, false>> = {
                    <std::__detail::_Hashtable_ebo_helper<0, std::__detail::_Identity, true>> = {
                      <std::__detail::_Identity> = {<No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<1, std::hash<folly::detail::EventBaseLocalBaseBase*>, true>> = {
                      <std::hash<folly::detail::EventBaseLocalBaseBase*>> = {
                        <std::__hash_base<unsigned long, folly::detail::EventBaseLocalBaseBase*>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<2, std::__detail::_Mod_range_hashing, true>> = {
                      <std::__detail::_Mod_range_hashing> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                  <std::__detail::_Hashtable_ebo_helper<0, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, true>> = {
                    <std::equal_to<folly::detail::EventBaseLocalBaseBase*>> = {
                      <std::binary_function<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, bool>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                <std::__detail::_Map_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {<No data fields>}, 
                <std::__detail::_Insert<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {
                  <std::__detail::_Insert_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true> >> = {<No data fields>}, <No data fields>}, 
                <std::__detail::_Rehash_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, std::integral_constant<bool, true> >> = {<No data fields>}, 
                <std::__detail::_Equality<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {<No data fields>}, 
                <std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> > >> = {
                  <std::__detail::_Hashtable_ebo_helper<0, std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >, true>> = {
                    <std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >> = {
                      <__gnu_cxx::new_allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                members of std::_Hashtable<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true> >: 
                _M_buckets = 0x7fe241f599e0, 
                _M_bucket_count = 1, 
                _M_before_begin = {
                  _M_nxt = 0x0
                }, 
                _M_element_count = 0, 
                _M_rehash_policy = {
                  static _S_growth_factor = 2, 
                  _M_max_load_factor = 1, 
                  _M_next_resize = 0
                }, 
                _M_single_bucket = 0x0
              }
            }, 
            virtualEventBaseInitFlag_ = {
              called_ = {
                _M_base = {
                  static _S_alignment = 1, 
                  _M_i = false
                }, 
                static is_always_lock_free = true
              }, 
              mutex_ = {
                static kReaderPriority = false, 
                state_ = {
                  <std::__atomic_base<unsigned int>> = {
                    static _S_alignment = 4, 
                    _M_i = 0
                  }, 
                  members of std::atomic<unsigned int>: 
                  static is_always_lock_free = true
                }, 
                static kIncrHasS = 2048, 
                static kHasS = 4294965248, 
                static kAnnotationCreated = 1024, 
                static kMayDefer = 512, 
                static kPrevDefer = 256, 
                static kHasE = 128, 
                static kBegunE = 64, 
                static kHasU = 32, 
                static kHasSolo = 224, 
                static kWaitingNotS = 16, 
                static kWaitingESingle = 4, 
                static kWaitingEMultiple = 8, 
                static kWaitingE = 12, 
                static kWaitingU = 2, 
                static kWaitingS = 1, 
                static kWaitingAny = 31, 
                static kNumSharedToStartDeferring = 2, 
                static kMaxSpinCount = 1000, 
                static kMaxSoftYieldCount = 1000, 
                static kDeferredSearchDistance = 2, 
                static kDeferredSeparationFactor = 4, 
                static kTokenStackTLSCapacity = 2, 
                static kTokenless = 1, 
                static tls_lastTokenlessSlot = 7, 
                static tls_lastDeferredReaderSlot = 7, 
                static deferredReaders = {{
                    <std::__atomic_base<unsigned long>> = {
                      static _S_alignment = 8, 
                      _M_i = 0
                    }, 
                    members of std::atomic<unsigned long>: 
                    static is_always_lock_free = true
                  } <repeats 2048 times>}
              }
            }, 
            virtualEventBase_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::VirtualEventBase*, std::default_delete<folly::VirtualEventBase> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::VirtualEventBase> >> = {
                      <std::_Head_base<1, std::default_delete<folly::VirtualEventBase>, true>> = {
                        <std::default_delete<folly::VirtualEventBase>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::VirtualEventBase*, false>> = {
                      _M_head_impl = 0x0
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            evb_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::EventBaseBackendBase*, std::default_delete<folly::EventBaseBackendBase> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::EventBaseBackendBase> >> = {
                      <std::_Head_base<1, std::default_delete<folly::EventBaseBackendBase>, true>> = {
                        <std::default_delete<folly::EventBaseBackendBase>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::EventBaseBackendBase*, false>> = {
                      _M_head_impl = 0x7fe2430265a0
                    }, <No data fields>}, <No data fields>}
              }
            }
          }, 
          mutex = {
            <std::__mutex_base> = {
              _M_mutex = {
                __data = {
                  __lock = 0, 
                  __count = 0, 
                  __owner = 0, 
                  __nusers = 0, 
                  __kind = 0, 
                  __spins = 0, 
                  __elision = 0, 
                  __list = {
                    __prev = 0x0, 
                    __next = 0x0
                  }
                }, 
                __size = '\000' <repeats 39 times>, 
                __align = 0
              }
            }, <No data fields>}, 
          index = 2, 
          subdoc_op = {
            m_path = 0x7fe241f4cf00, 
            m_jsn = 0x143e7e0, 
            m_match = {
              type = 0, 
              status = 0, 
              matchres = 0, 
              sflags = 0, 
              match_level = 0, 
              position = 0, 
              num_siblings = 0, 
              num_children = 0, 
              immediate_parent_found = 0 '\000', 
              get_last = 0 '\000', 
              extra_options = Subdoc::Match::GET_MATCH_ONLY, 
              unique_item_found = 0 '\000', 
              loc_deepest = {
                at = 0x0, 
                length = 0
              }, 
              loc_key = {
                at = 0x0, 
                length = 0
              }, 
              ensure_unique = {
                at = 0x0, 
                length = 0
              }
            }, 
            m_optype = {
              code = 0 '\000'
            }, 
            m_doc = {
              at = 0x0, 
              length = 0
            }, 
            m_userval = {
              at = 0x0, 
              length = 0
            }, 
            m_result = 0x0
          }, 
          validator = {
            instance = {
              state = 5, 
              stack = {
                <std::stack<JSON_checker::Modes, std::deque<JSON_checker::Modes, std::allocator<JSON_checker::Modes> > >> = {
                  c = {
                    <std::_Deque_base<JSON_checker::Modes, std::allocator<JSON_checker::Modes> >> = {
                      _M_impl = {
                        <std::allocator<JSON_checker::Modes>> = {
                          <__gnu_cxx::new_allocator<JSON_checker::Modes>> = {<No data fields>}, <No data fields>}, 
                        <std::_Deque_base<JSON_checker::Modes, std::allocator<JSON_checker::Modes> >::_Deque_impl_data> = {
                          _M_map = 0x7fe241f07980, 
                          _M_map_size = 8, 
                          _M_start = {
                            _M_cur = 0x7fe243041800, 
                            _M_first = 0x7fe243041800, 
                            _M_last = 0x7fe243041a00, 
                            _M_node = 0x7fe241f07998
                          }, 
                          _M_finish = {
                            _M_cur = 0x7fe243041801, 
                            _M_first = 0x7fe243041800, 
                            _M_last = 0x7fe243041a00, 
                            _M_node = 0x7fe241f07998
                          }
                        }, <No data fields>}
                    }, <No data fields>}
                }, <No data fields>}
            }
          }, 
          running = {
            _M_base = {
              static _S_alignment = 1, 
              _M_i = true
            }, 
            static is_always_lock_free = true
          }, 
          scratch_buffer = {
            _M_elems = '\000' <repeats 2047 times>
          }, 
          shutdown_next_log = 0, 
          new_conn_queue = {
            connections = {
              <folly::SynchronizedBase<folly::Synchronized<std::vector<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >, std::mutex>, (folly::detail::MutexLevel)0>> = {<No data fields>}, 
              members of folly::Synchronized<std::vector<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >, std::mutex>: 
              static nxCopyCtor = <optimized out>, 
              static nxMoveCtor = <optimized out>, 
              datum_ = {
                <std::_Vector_base<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >> = {
                  _M_impl = {
                    <std::allocator<FrontEndThread::ConnectionQueue::Entry>> = {
                      <__gnu_cxx::new_allocator<FrontEndThread::ConnectionQueue::Entry>> = {<No data fields>}, <No data fields>}, 
                    <std::_Vector_base<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >::_Vector_impl_data> = {
                      _M_start = 0x0, 
                      _M_finish = 0x0, 
                      _M_end_of_storage = 0x0
                    }, <No data fields>}
                }, <No data fields>}, 
              mutex_ = {
                <std::__mutex_base> = {
                  _M_mutex = {
                    __data = {
                      __lock = 0, 
                      __count = 0, 
                      __owner = 0, 
                      __nusers = 0, 
                      __kind = 0, 
                      __spins = 0, 
                      __elision = 0, 
                      __list = {
                        __prev = 0x0, 
                        __next = 0x0
                      }
                    }, 
                    __size = '\000' <repeats 39 times>, 
                    __align = 0
                  }
                }, <No data fields>}
            }
          }
        }
#7  0x0000000000ba43f9 in run (this=0x7fe241eb3900) at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:51
No locals.
#8  platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:64
No locals.
#9  0x00007fe245e85ea5 in start_thread (arg=0x7fe23caf4700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe23caf4700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609657456384, 3016376877879321588, 0, 8392704, 0, 140609657456384, -3019615628165979148, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#10 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 11 (Thread 0x7fe23d2f5700 (LWP 84464)):
#0  0x00007fe2437c6eb3 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fe24515a3c5 in epoll_dispatch (base=0x7fe241ec2c00, tv=<optimized out>) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/epoll.c:465
        epollop = 0x7fe241f1e0a0
        events = 0x7fe24301f800
        i = <optimized out>
        res = <optimized out>
        timeout = <optimized out>
        __func__ = "epoll_dispatch"
#2  0x00007fe245151376 in event_base_loop (base=0x7fe241ec2c00, flags=1) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/event.c:1998
        evsel = 0x7fe245364c20 <epollops>
        tv = {
          tv_sec = 48, 
          tv_usec = 140609745947616
        }
        tv_p = <optimized out>
        res = <optimized out>
        done = 0
        retval = 0
        __func__ = "event_base_loop"
#3  0x0000000000c186f7 in folly::EventBase::loopBody (this=this@entry=0x7fe241f58be0, flags=flags@entry=0, ignoreKeepAlive=ignoreKeepAlive@entry=false)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:397
        callbacks = {
          <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
            static constant_time_size = false, 
            static stateful_value_traits = <optimized out>, 
            static has_container_from_iterator = <optimized out>, 
            static safemode_or_autounlink = true, 
            data_ = {
              <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                static link_mode = boost::intrusive::auto_unlink
              }, 
              members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
              root_plus_size_ = {
                <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                  static constant_time_size = <optimized out>
                }, 
                members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                m_header = {
                  <boost::intrusive::list_node<void*>> = {
                    next_ = 0x7fe23d2e3620, 
                    prev_ = 0x7fe23d2e3620
                  }, <No data fields>}
              }
            }
          }, <No data fields>}
        message = 0xce1548 "Your code just tried to loop over an event base from inside another event base loop. Since libevent is not reentrant, this leads to undefined behavior in opt builds. Please fix immediately. For the co"...
        SCOPE_EXIT_STATE13 = {
          <folly::detail::ScopeGuardImplBase> = {
            dismissed_ = false
          }, 
          members of folly::detail::ScopeGuardImpl<folly::EventBase::loopBody(int, bool)::<lambda()>, true>: 
          function_ = {
            __this = 0x7fe241f58be0
          }
        }
        res = 0
        ranLoopCallbacks = <optimized out>
        blocking = true
        once = false
        prev = {
          __d = {
            __r = 9751039117078916
          }
        }
        idleStart = {
          __d = {
            __r = 9770378909073204
          }
        }
        busy = <optimized out>
        idle = <optimized out>
        prevLoopThread = {
          _M_thread = 0
        }
#4  0x0000000000c18bc6 in folly::EventBase::loop (this=this@entry=0x7fe241f58be0) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:315
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xce11bb "EventBase", 
                e_ = 0xce11c4 ""
              }
            }
          }
        }
#5  0x0000000000c1a586 in folly::EventBase::loopForever (this=this@entry=0x7fe241f58be0) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:538
        ret = <optimized out>
#6  0x00000000005b0339 in worker_libevent (arg=0x7fe241f58bd0) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/daemon/thread.cc:115
        me = @0x7fe241f58bd0: {
          thread_id = 140609665849088, 
          eventBase = {
            <folly::TimeoutManager> = {
              _vptr.TimeoutManager = 0x1091d68 <vtable for folly::EventBase+24>, 
              cobTimeouts_ = {
                _M_t = {
                  _M_t = {
                    <std::_Tuple_impl<0, folly::TimeoutManager::CobTimeouts*, std::default_delete<folly::TimeoutManager::CobTimeouts> >> = {
                      <std::_Tuple_impl<1, std::default_delete<folly::TimeoutManager::CobTimeouts> >> = {
                        <std::_Head_base<1, std::default_delete<folly::TimeoutManager::CobTimeouts>, true>> = {
                          <std::default_delete<folly::TimeoutManager::CobTimeouts>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                      <std::_Head_base<0, folly::TimeoutManager::CobTimeouts*, false>> = {
                        _M_head_impl = 0x7fe2430265d0
                      }, <No data fields>}, <No data fields>}
                }
              }
            }, 
            <folly::DrivableExecutor> = {
              <folly::Executor> = {
                _vptr.Executor = 0x1091e28 <vtable for folly::EventBase+216>, 
                static LO_PRI = -128 '\200', 
                static MID_PRI = 0 '\000', 
                static HI_PRI = 127 '\177'
              }, <No data fields>}, 
            <folly::IOExecutor> = {<No data fields>}, 
            <folly::SequencedExecutor> = {<No data fields>}, 
            <folly::ScheduledExecutor> = {<No data fields>}, 
            members of folly::EventBase: 
            intervalDuration_ = {
              __r = 10
            }, 
            wheelTimer_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::HHWheelTimerBase<std::chrono::duration<long, std::ratio<1, 1000> > >*, folly::DelayedDestruction::Destructor>> = {
                    <std::_Tuple_impl<1, folly::DelayedDestruction::Destructor>> = {
                      <std::_Head_base<1, folly::DelayedDestruction::Destructor, true>> = {
                        <folly::DelayedDestruction::Destructor> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::HHWheelTimerBase<std::chrono::duration<long, std::ratio<1, 1000> > >*, false>> = {
                      _M_head_impl = 0x0
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            loopCallbacks_ = {
              <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
                static constant_time_size = false, 
                static stateful_value_traits = <optimized out>, 
                static has_container_from_iterator = <optimized out>, 
                static safemode_or_autounlink = true, 
                data_ = {
                  <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                    <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                    members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                    static link_mode = boost::intrusive::auto_unlink
                  }, 
                  members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
                  root_plus_size_ = {
                    <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                      static constant_time_size = <optimized out>
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                    m_header = {
                      <boost::intrusive::list_node<void*>> = {
                        next_ = 0x7fe241f58c20, 
                        prev_ = 0x7fe241f58c20
                      }, <No data fields>}
                  }
                }
              }, <No data fields>}, 
            runBeforeLoopCallbacks_ = {
              <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
                static constant_time_size = false, 
                static stateful_value_traits = <optimized out>, 
                static has_container_from_iterator = <optimized out>, 
                static safemode_or_autounlink = true, 
                data_ = {
                  <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                    <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                    members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                    static link_mode = boost::intrusive::auto_unlink
                  }, 
                  members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
                  root_plus_size_ = {
                    <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                      static constant_time_size = <optimized out>
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                    m_header = {
                      <boost::intrusive::list_node<void*>> = {
                        next_ = 0x7fe241f58c30, 
                        prev_ = 0x7fe241f58c30
                      }, <No data fields>}
                  }
                }
              }, <No data fields>}, 
            onDestructionCallbacks_ = {
              <folly::SynchronizedBase<folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >, (folly::detail::MutexLevel)2>> = {
                <folly::SynchronizedBase<folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >, (folly::detail::MutexLevel)1>> = {<No data fields>}, <No data fields>}, 
              members of folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >: 
              static nxCopyCtor = <error reading variable: No global symbol "folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >::nxCopyCtor".>, 
              static nxMoveCtor = <error reading variable: No global symbol "folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >::nxMoveCtor".>, 
              datum_ = {
                <boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>> = {
                  static constant_time_size = true, 
                  static stateful_value_traits = <optimized out>, 
                  static has_container_from_iterator = <optimized out>, 
                  static safemode_or_autounlink = false, 
                  data_ = {
                    <boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>> = {
                      static link_mode = boost::intrusive::normal_link
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>::data_t: 
                    root_plus_size_ = {
                      <boost::intrusive::detail::size_holder<true, unsigned long, void>> = {
                        static constant_time_size = <optimized out>, 
                        size_ = 0
                      }, 
                      members of boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>::root_plus_size: 
                      m_header = {
                        <boost::intrusive::list_node<void*>> = {
                          next_ = 0x7fe241f58c48, 
                          prev_ = 0x7fe241f58c48
                        }, <No data fields>}
                    }
                  }
                }, <No data fields>}, 
              mutex_ = {
                static kReaderPriority = false, 
                state_ = {
                  <std::__atomic_base<unsigned int>> = {
                    static _S_alignment = 4, 
                    _M_i = 0
                  }, 
                  members of std::atomic<unsigned int>: 
                  static is_always_lock_free = true
                }, 
                static kIncrHasS = 2048, 
                static kHasS = 4294965248, 
                static kAnnotationCreated = 1024, 
                static kMayDefer = 512, 
                static kPrevDefer = 256, 
                static kHasE = 128, 
                static kBegunE = 64, 
                static kHasU = 32, 
                static kHasSolo = 224, 
                static kWaitingNotS = 16, 
                static kWaitingESingle = 4, 
                static kWaitingEMultiple = 8, 
                static kWaitingE = 12, 
                static kWaitingU = 2, 
                static kWaitingS = 1, 
                static kWaitingAny = 31, 
                static kNumSharedToStartDeferring = 2, 
                static kMaxSpinCount = 1000, 
                static kMaxSoftYieldCount = 1000, 
                static kDeferredSearchDistance = 2, 
                static kDeferredSeparationFactor = 4, 
                static kTokenStackTLSCapacity = 2, 
                static kTokenless = 1, 
                static tls_lastTokenlessSlot = 5, 
                static tls_lastDeferredReaderSlot = 5, 
                static deferredReaders = {{
                    <std::__atomic_base<unsigned long>> = {
                      static _S_alignment = 8, 
                      _M_i = 0
                    }, 
                    members of std::atomic<unsigned long>: 
                    static is_always_lock_free = true
                  } <repeats 2048 times>}
              }
            }, 
            runOnceCallbacks_ = 0x0, 
            stop_ = {
              _M_base = {
                static _S_alignment = 1, 
                _M_i = false
              }, 
              static is_always_lock_free = true
            }, 
            loopThread_ = {
              static _S_min_alignment = 8, 
              static _S_alignment = 8, 
              _M_i = {
                _M_thread = 140609665849088
              }, 
              static is_always_lock_free = <error reading variable: No global symbol "std::atomic<std::thread::id>::is_always_lock_free".>
            }, 
            queue_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::NotificationQueue<folly::Function<void()> >*, std::default_delete<folly::NotificationQueue<folly::Function<void()> > > >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::NotificationQueue<folly::Function<void()> > > >> = {
                      <std::_Head_base<1, std::default_delete<folly::NotificationQueue<folly::Function<void()> > >, true>> = {
                        <std::default_delete<folly::NotificationQueue<folly::Function<void()> > >> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::NotificationQueue<folly::Function<void()> >*, false>> = {
                      _M_head_impl = 0x7fe241f07940
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            fnRunner_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::EventBase::FunctionRunner*, std::default_delete<folly::EventBase::FunctionRunner> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::EventBase::FunctionRunner> >> = {
                      <std::_Head_base<1, std::default_delete<folly::EventBase::FunctionRunner>, true>> = {
                        <std::default_delete<folly::EventBase::FunctionRunner>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::EventBase::FunctionRunner*, false>> = {
                      _M_head_impl = 0x7fe24305cc00
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            loopKeepAliveCount_ = 1, 
            loopKeepAliveCountAtomic_ = {
              <std::__atomic_base<long>> = {
                static _S_alignment = 8, 
                _M_i = 0
              }, 
              members of std::atomic<long>: 
              static is_always_lock_free = true
            }, 
            loopKeepAliveActive_ = true, 
            maxLatency_ = {
              __r = 0
            }, 
            avgLoopTime_ = {
              expCoeff_ = -4.9999999999999998e-07, 
              value_ = 32.813816270620976, 
              buffer_time_ = {
                __r = 3182
              }, 
              busy_buffer_ = {
                __r = 21
              }, 
              buffer_cnt_ = 10, 
              static buffer_interval_ = {
                __r = 10
              }
            }, 
            maxLatencyLoopTime_ = {
              expCoeff_ = -4.9999999999999998e-07, 
              value_ = 32.813816270620976, 
              buffer_time_ = {
                __r = 3182
              }, 
              busy_buffer_ = {
                __r = 21
              }, 
              buffer_cnt_ = 10, 
              static buffer_interval_ = {
                __r = 10
              }
            }, 
            maxLatencyCob_ = {
              <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
              members of folly::Function<void()>: 
              data_ = {
                big = 0x0, 
                tiny = {
                  __data = '\000' <repeats 47 times>, 
                  __align = {<No data fields>}
                }
              }, 
              call_ = 0x4664dd <folly::detail::function::FunctionTraits<void ()>::uninitCall(folly::detail::function::Data&)>, 
              exec_ = 0x0
            }, 
            enableTimeMeasurement_ = true, 
            nextLoopCnt_ = 8049904, 
            latestLoopCnt_ = 8049903, 
            startWork_ = {
              __d = {
                __r = 9770378909072067
              }
            }, 
            invokingLoop_ = true, 
            observer_ = {
              <std::__shared_ptr<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2>> = {
                <std::__shared_ptr_access<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                members of std::__shared_ptr<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2>: 
                _M_ptr = 0x0, 
                _M_refcount = {
                  _M_pi = 0x0
                }
              }, <No data fields>}, 
            observerSampleCount_ = 0, 
            executionObserver_ = 0x0, 
            name_ = {
              static npos = 18446744073709551615, 
              _M_dataplus = {
                <std::allocator<char>> = {
                  <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                _M_p = 0x7fe241f58d98 ""
              }, 
              _M_string_length = 0, 
              {
                _M_local_buf = '\000' <repeats 15 times>, 
                _M_allocated_capacity = 0
              }
            }, 
            localStorage_ = {
              _M_h = {
                <std::__detail::_Hashtable_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<false, false, true> >> = {
                  <std::__detail::_Hash_code_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::__detail::_Select1st, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, false>> = {
                    <std::__detail::_Hashtable_ebo_helper<0, std::__detail::_Select1st, true>> = {
                      <std::__detail::_Select1st> = {<No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<1, std::hash<unsigned long>, true>> = {
                      <std::hash<unsigned long>> = {
                        <std::__hash_base<unsigned long, unsigned long>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<2, std::__detail::_Mod_range_hashing, true>> = {
                      <std::__detail::_Mod_range_hashing> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                  <std::__detail::_Hashtable_ebo_helper<0, std::equal_to<unsigned long>, true>> = {
                    <std::equal_to<unsigned long>> = {
                      <std::binary_function<unsigned long, unsigned long, bool>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                <std::__detail::_Map_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, true>> = {<No data fields>}, 
                <std::__detail::_Insert<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, false>> = {
                  <std::__detail::_Insert_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >> = {<No data fields>}, <No data fields>}, 
                <std::__detail::_Rehash_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, std::integral_constant<bool, true> >> = {<No data fields>}, 
                <std::__detail::_Equality<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, true>> = {<No data fields>}, 
                <std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> > >> = {
                  <std::__detail::_Hashtable_ebo_helper<0, std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >, true>> = {
                    <std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >> = {
                      <__gnu_cxx::new_allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                members of std::_Hashtable<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >: 
                _M_buckets = 0x7fe241f58dd8, 
                _M_bucket_count = 1, 
                _M_before_begin = {
                  _M_nxt = 0x0
                }, 
                _M_element_count = 0, 
                _M_rehash_policy = {
                  static _S_growth_factor = 2, 
                  _M_max_load_factor = 1, 
                  _M_next_resize = 0
                }, 
                _M_single_bucket = 0x0
              }
            }, 
            localStorageToDtor_ = {
              _M_h = {
                <std::__detail::_Hashtable_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<false, true, true> >> = {
                  <std::__detail::_Hash_code_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::__detail::_Identity, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, false>> = {
                    <std::__detail::_Hashtable_ebo_helper<0, std::__detail::_Identity, true>> = {
                      <std::__detail::_Identity> = {<No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<1, std::hash<folly::detail::EventBaseLocalBaseBase*>, true>> = {
                      <std::hash<folly::detail::EventBaseLocalBaseBase*>> = {
                        <std::__hash_base<unsigned long, folly::detail::EventBaseLocalBaseBase*>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<2, std::__detail::_Mod_range_hashing, true>> = {
                      <std::__detail::_Mod_range_hashing> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                  <std::__detail::_Hashtable_ebo_helper<0, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, true>> = {
                    <std::equal_to<folly::detail::EventBaseLocalBaseBase*>> = {
                      <std::binary_function<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, bool>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                <std::__detail::_Map_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {<No data fields>}, 
                <std::__detail::_Insert<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {
                  <std::__detail::_Insert_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true> >> = {<No data fields>}, <No data fields>}, 
                <std::__detail::_Rehash_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, std::integral_constant<bool, true> >> = {<No data fields>}, 
                <std::__detail::_Equality<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {<No data fields>}, 
                <std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> > >> = {
                  <std::__detail::_Hashtable_ebo_helper<0, std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >, true>> = {
                    <std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >> = {
                      <__gnu_cxx::new_allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                members of std::_Hashtable<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true> >: 
                _M_buckets = 0x7fe241f58e10, 
                _M_bucket_count = 1, 
                _M_before_begin = {
                  _M_nxt = 0x0
                }, 
                _M_element_count = 0, 
                _M_rehash_policy = {
                  static _S_growth_factor = 2, 
                  _M_max_load_factor = 1, 
                  _M_next_resize = 0
                }, 
                _M_single_bucket = 0x0
              }
            }, 
            virtualEventBaseInitFlag_ = {
              called_ = {
                _M_base = {
                  static _S_alignment = 1, 
                  _M_i = false
                }, 
                static is_always_lock_free = true
              }, 
              mutex_ = {
                static kReaderPriority = false, 
                state_ = {
                  <std::__atomic_base<unsigned int>> = {
                    static _S_alignment = 4, 
                    _M_i = 0
                  }, 
                  members of std::atomic<unsigned int>: 
                  static is_always_lock_free = true
                }, 
                static kIncrHasS = 2048, 
                static kHasS = 4294965248, 
                static kAnnotationCreated = 1024, 
                static kMayDefer = 512, 
                static kPrevDefer = 256, 
                static kHasE = 128, 
                static kBegunE = 64, 
                static kHasU = 32, 
                static kHasSolo = 224, 
                static kWaitingNotS = 16, 
                static kWaitingESingle = 4, 
                static kWaitingEMultiple = 8, 
                static kWaitingE = 12, 
                static kWaitingU = 2, 
                static kWaitingS = 1, 
                static kWaitingAny = 31, 
                static kNumSharedToStartDeferring = 2, 
                static kMaxSpinCount = 1000, 
                static kMaxSoftYieldCount = 1000, 
                static kDeferredSearchDistance = 2, 
                static kDeferredSeparationFactor = 4, 
                static kTokenStackTLSCapacity = 2, 
                static kTokenless = 1, 
                static tls_lastTokenlessSlot = 5, 
                static tls_lastDeferredReaderSlot = 5, 
                static deferredReaders = {{
                    <std::__atomic_base<unsigned long>> = {
                      static _S_alignment = 8, 
                      _M_i = 0
                    }, 
                    members of std::atomic<unsigned long>: 
                    static is_always_lock_free = true
                  } <repeats 2048 times>}
              }
            }, 
            virtualEventBase_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::VirtualEventBase*, std::default_delete<folly::VirtualEventBase> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::VirtualEventBase> >> = {
                      <std::_Head_base<1, std::default_delete<folly::VirtualEventBase>, true>> = {
                        <std::default_delete<folly::VirtualEventBase>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::VirtualEventBase*, false>> = {
                      _M_head_impl = 0x0
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            evb_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::EventBaseBackendBase*, std::default_delete<folly::EventBaseBackendBase> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::EventBaseBackendBase> >> = {
                      <std::_Head_base<1, std::default_delete<folly::EventBaseBackendBase>, true>> = {
                        <std::default_delete<folly::EventBaseBackendBase>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::EventBaseBackendBase*, false>> = {
                      _M_head_impl = 0x7fe2430265c0
                    }, <No data fields>}, <No data fields>}
              }
            }
          }, 
          mutex = {
            <std::__mutex_base> = {
              _M_mutex = {
                __data = {
                  __lock = 0, 
                  __count = 0, 
                  __owner = 0, 
                  __nusers = 0, 
                  __kind = 0, 
                  __spins = 0, 
                  __elision = 0, 
                  __list = {
                    __prev = 0x0, 
                    __next = 0x0
                  }
                }, 
                __size = '\000' <repeats 39 times>, 
                __align = 0
              }
            }, <No data fields>}, 
          index = 1, 
          subdoc_op = {
            m_path = 0x7fe241f4ca00, 
            m_jsn = 0x143e000, 
            m_match = {
              type = 0, 
              status = 0, 
              matchres = 0, 
              sflags = 0, 
              match_level = 0, 
              position = 0, 
              num_siblings = 0, 
              num_children = 0, 
              immediate_parent_found = 0 '\000', 
              get_last = 0 '\000', 
              extra_options = Subdoc::Match::GET_MATCH_ONLY, 
              unique_item_found = 0 '\000', 
              loc_deepest = {
                at = 0x0, 
                length = 0
              }, 
              loc_key = {
                at = 0x0, 
                length = 0
              }, 
              ensure_unique = {
                at = 0x0, 
                length = 0
              }
            }, 
            m_optype = {
              code = 0 '\000'
            }, 
            m_doc = {
              at = 0x0, 
              length = 0
            }, 
            m_userval = {
              at = 0x0, 
              length = 0
            }, 
            m_result = 0x0
          }, 
          validator = {
            instance = {
              state = 5, 
              stack = {
                <std::stack<JSON_checker::Modes, std::deque<JSON_checker::Modes, std::allocator<JSON_checker::Modes> > >> = {
                  c = {
                    <std::_Deque_base<JSON_checker::Modes, std::allocator<JSON_checker::Modes> >> = {
                      _M_impl = {
                        <std::allocator<JSON_checker::Modes>> = {
                          <__gnu_cxx::new_allocator<JSON_checker::Modes>> = {<No data fields>}, <No data fields>}, 
                        <std::_Deque_base<JSON_checker::Modes, std::allocator<JSON_checker::Modes> >::_Deque_impl_data> = {
                          _M_map = 0x7fe241f07c40, 
                          _M_map_size = 8, 
                          _M_start = {
                            _M_cur = 0x7fe243041600, 
                            _M_first = 0x7fe243041600, 
                            _M_last = 0x7fe243041800, 
                            _M_node = 0x7fe241f07c58
                          }, 
                          _M_finish = {
                            _M_cur = 0x7fe243041601, 
                            _M_first = 0x7fe243041600, 
                            _M_last = 0x7fe243041800, 
                            _M_node = 0x7fe241f07c58
                          }
                        }, <No data fields>}
                    }, <No data fields>}
                }, <No data fields>}
            }
          }, 
          running = {
            _M_base = {
              static _S_alignment = 1, 
              _M_i = true
            }, 
            static is_always_lock_free = true
          }, 
          scratch_buffer = {
            _M_elems = '\000' <repeats 2047 times>
          }, 
          shutdown_next_log = 0, 
          new_conn_queue = {
            connections = {
              <folly::SynchronizedBase<folly::Synchronized<std::vector<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >, std::mutex>, (folly::detail::MutexLevel)0>> = {<No data fields>}, 
              members of folly::Synchronized<std::vector<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >, std::mutex>: 
              static nxCopyCtor = <optimized out>, 
              static nxMoveCtor = <optimized out>, 
              datum_ = {
                <std::_Vector_base<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >> = {
                  _M_impl = {
                    <std::allocator<FrontEndThread::ConnectionQueue::Entry>> = {
                      <__gnu_cxx::new_allocator<FrontEndThread::ConnectionQueue::Entry>> = {<No data fields>}, <No data fields>}, 
                    <std::_Vector_base<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >::_Vector_impl_data> = {
                      _M_start = 0x0, 
                      _M_finish = 0x0, 
                      _M_end_of_storage = 0x0
                    }, <No data fields>}
                }, <No data fields>}, 
              mutex_ = {
                <std::__mutex_base> = {
                  _M_mutex = {
                    __data = {
                      __lock = 0, 
                      __count = 0, 
                      __owner = 0, 
                      __nusers = 0, 
                      __kind = 0, 
                      __spins = 0, 
                      __elision = 0, 
                      __list = {
                        __prev = 0x0, 
                        __next = 0x0
                      }
                    }, 
                    __size = '\000' <repeats 39 times>, 
                    __align = 0
                  }
                }, <No data fields>}
            }
          }
        }
#7  0x0000000000ba43f9 in run (this=0x7fe241eb37e0) at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:51
No locals.
#8  platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:64
No locals.
#9  0x00007fe245e85ea5 in start_thread (arg=0x7fe23d2f5700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe23d2f5700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609665849088, 3016376877879321588, 0, 8392704, 0, 140609665849088, -3019618927237733388, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#10 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 10 (Thread 0x7fe23daf6700 (LWP 84463)):
#0  0x00007fe2437c6eb3 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fe24515a3c5 in epoll_dispatch (base=0x7fe241ec2900, tv=<optimized out>) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/epoll.c:465
        epollop = 0x7fe241e86760
        events = 0x7fe24301f680
        i = <optimized out>
        res = <optimized out>
        timeout = <optimized out>
        __func__ = "epoll_dispatch"
#2  0x00007fe245151376 in event_base_loop (base=0x7fe241ec2900, flags=1) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/event.c:1998
        evsel = 0x7fe245364c20 <epollops>
        tv = {
          tv_sec = 48, 
          tv_usec = 140609745944592
        }
        tv_p = <optimized out>
        res = <optimized out>
        done = 0
        retval = 0
        __func__ = "event_base_loop"
#3  0x0000000000c186f7 in folly::EventBase::loopBody (this=this@entry=0x7fe241f58010, flags=flags@entry=0, ignoreKeepAlive=ignoreKeepAlive@entry=false)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:397
        callbacks = {
          <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
            static constant_time_size = false, 
            static stateful_value_traits = <optimized out>, 
            static has_container_from_iterator = <optimized out>, 
            static safemode_or_autounlink = true, 
            data_ = {
              <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                static link_mode = boost::intrusive::auto_unlink
              }, 
              members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
              root_plus_size_ = {
                <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                  static constant_time_size = <optimized out>
                }, 
                members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                m_header = {
                  <boost::intrusive::list_node<void*>> = {
                    next_ = 0x7fe23dae4620, 
                    prev_ = 0x7fe23dae4620
                  }, <No data fields>}
              }
            }
          }, <No data fields>}
        message = 0xce1548 "Your code just tried to loop over an event base from inside another event base loop. Since libevent is not reentrant, this leads to undefined behavior in opt builds. Please fix immediately. For the co"...
        SCOPE_EXIT_STATE13 = {
          <folly::detail::ScopeGuardImplBase> = {
            dismissed_ = false
          }, 
          members of folly::detail::ScopeGuardImpl<folly::EventBase::loopBody(int, bool)::<lambda()>, true>: 
          function_ = {
            __this = 0x7fe241f58010
          }
        }
        res = 0
        ranLoopCallbacks = <optimized out>
        blocking = true
        once = false
        prev = {
          __d = {
            __r = 9751039117004213
          }
        }
        idleStart = {
          __d = {
            __r = 9770378904805594
          }
        }
        busy = <optimized out>
        idle = <optimized out>
        prevLoopThread = {
          _M_thread = 0
        }
#4  0x0000000000c18bc6 in folly::EventBase::loop (this=this@entry=0x7fe241f58010) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:315
        guard = {
          list_ = {
            forbid = true, 
            prev = 0x0, 
            curr = {
              name = {
                static npos = <optimized out>, 
                b_ = 0xce11bb "EventBase", 
                e_ = 0xce11c4 ""
              }
            }
          }
        }
#5  0x0000000000c1a586 in folly::EventBase::loopForever (this=this@entry=0x7fe241f58010) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:538
        ret = <optimized out>
#6  0x00000000005b0339 in worker_libevent (arg=0x7fe241f58000) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/daemon/thread.cc:115
        me = @0x7fe241f58000: {
          thread_id = 140609674241792, 
          eventBase = {
            <folly::TimeoutManager> = {
              _vptr.TimeoutManager = 0x1091d68 <vtable for folly::EventBase+24>, 
              cobTimeouts_ = {
                _M_t = {
                  _M_t = {
                    <std::_Tuple_impl<0, folly::TimeoutManager::CobTimeouts*, std::default_delete<folly::TimeoutManager::CobTimeouts> >> = {
                      <std::_Tuple_impl<1, std::default_delete<folly::TimeoutManager::CobTimeouts> >> = {
                        <std::_Head_base<1, std::default_delete<folly::TimeoutManager::CobTimeouts>, true>> = {
                          <std::default_delete<folly::TimeoutManager::CobTimeouts>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                      <std::_Head_base<0, folly::TimeoutManager::CobTimeouts*, false>> = {
                        _M_head_impl = 0x7fe243026450
                      }, <No data fields>}, <No data fields>}
                }
              }
            }, 
            <folly::DrivableExecutor> = {
              <folly::Executor> = {
                _vptr.Executor = 0x1091e28 <vtable for folly::EventBase+216>, 
                static LO_PRI = -128 '\200', 
                static MID_PRI = 0 '\000', 
                static HI_PRI = 127 '\177'
              }, <No data fields>}, 
            <folly::IOExecutor> = {<No data fields>}, 
            <folly::SequencedExecutor> = {<No data fields>}, 
            <folly::ScheduledExecutor> = {<No data fields>}, 
            members of folly::EventBase: 
            intervalDuration_ = {
              __r = 10
            }, 
            wheelTimer_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::HHWheelTimerBase<std::chrono::duration<long, std::ratio<1, 1000> > >*, folly::DelayedDestruction::Destructor>> = {
                    <std::_Tuple_impl<1, folly::DelayedDestruction::Destructor>> = {
                      <std::_Head_base<1, folly::DelayedDestruction::Destructor, true>> = {
                        <folly::DelayedDestruction::Destructor> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::HHWheelTimerBase<std::chrono::duration<long, std::ratio<1, 1000> > >*, false>> = {
                      _M_head_impl = 0x0
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            loopCallbacks_ = {
              <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
                static constant_time_size = false, 
                static stateful_value_traits = <optimized out>, 
                static has_container_from_iterator = <optimized out>, 
                static safemode_or_autounlink = true, 
                data_ = {
                  <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                    <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                    members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                    static link_mode = boost::intrusive::auto_unlink
                  }, 
                  members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
                  root_plus_size_ = {
                    <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                      static constant_time_size = <optimized out>
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                    m_header = {
                      <boost::intrusive::list_node<void*>> = {
                        next_ = 0x7fe241f58050, 
                        prev_ = 0x7fe241f58050
                      }, <No data fields>}
                  }
                }
              }, <No data fields>}, 
            runBeforeLoopCallbacks_ = {
              <boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
                static constant_time_size = false, 
                static stateful_value_traits = <optimized out>, 
                static has_container_from_iterator = <optimized out>, 
                static safemode_or_autounlink = true, 
                data_ = {
                  <boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {
                    <boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, 
                    members of boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>: 
                    static link_mode = boost::intrusive::auto_unlink
                  }, 
                  members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::data_t: 
                  root_plus_size_ = {
                    <boost::intrusive::detail::size_holder<false, unsigned long, void>> = {
                      static constant_time_size = <optimized out>
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>::root_plus_size: 
                    m_header = {
                      <boost::intrusive::list_node<void*>> = {
                        next_ = 0x7fe241f58060, 
                        prev_ = 0x7fe241f58060
                      }, <No data fields>}
                  }
                }
              }, <No data fields>}, 
            onDestructionCallbacks_ = {
              <folly::SynchronizedBase<folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >, (folly::detail::MutexLevel)2>> = {
                <folly::SynchronizedBase<folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >, (folly::detail::MutexLevel)1>> = {<No data fields>}, <No data fields>}, 
              members of folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >: 
              static nxCopyCtor = <error reading variable: No global symbol "folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >::nxCopyCtor".>, 
              static nxMoveCtor = <error reading variable: No global symbol "folly::Synchronized<boost::intrusive::list<folly::EventBase::OnDestructionCallback, boost::intrusive::member_hook<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_> >, folly::SharedMutexImpl<false, void, std::atomic, false, false> >::nxMoveCtor".>, 
              datum_ = {
                <boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>> = {
                  static constant_time_size = true, 
                  static stateful_value_traits = <optimized out>, 
                  static has_container_from_iterator = <optimized out>, 
                  static safemode_or_autounlink = false, 
                  data_ = {
                    <boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>> = {
                      static link_mode = boost::intrusive::normal_link
                    }, 
                    members of boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>::data_t: 
                    root_plus_size_ = {
                      <boost::intrusive::detail::size_holder<true, unsigned long, void>> = {
                        static constant_time_size = <optimized out>, 
                        size_ = 0
                      }, 
                      members of boost::intrusive::list_impl<boost::intrusive::mhtraits<folly::EventBase::OnDestructionCallback, boost::intrusive::list_member_hook<boost::intrusive::link_mode<(boost::intrusive::link_mode_type)0> >, &folly::EventBase::OnDestructionCallback::listHook_>, unsigned long, true, void>::root_plus_size: 
                      m_header = {
                        <boost::intrusive::list_node<void*>> = {
                          next_ = 0x7fe241f58078, 
                          prev_ = 0x7fe241f58078
                        }, <No data fields>}
                    }
                  }
                }, <No data fields>}, 
              mutex_ = {
                static kReaderPriority = false, 
                state_ = {
                  <std::__atomic_base<unsigned int>> = {
                    static _S_alignment = 4, 
                    _M_i = 0
                  }, 
                  members of std::atomic<unsigned int>: 
                  static is_always_lock_free = true
                }, 
                static kIncrHasS = 2048, 
                static kHasS = 4294965248, 
                static kAnnotationCreated = 1024, 
                static kMayDefer = 512, 
                static kPrevDefer = 256, 
                static kHasE = 128, 
                static kBegunE = 64, 
                static kHasU = 32, 
                static kHasSolo = 224, 
                static kWaitingNotS = 16, 
                static kWaitingESingle = 4, 
                static kWaitingEMultiple = 8, 
                static kWaitingE = 12, 
                static kWaitingU = 2, 
                static kWaitingS = 1, 
                static kWaitingAny = 31, 
                static kNumSharedToStartDeferring = 2, 
                static kMaxSpinCount = 1000, 
                static kMaxSoftYieldCount = 1000, 
                static kDeferredSearchDistance = 2, 
                static kDeferredSeparationFactor = 4, 
                static kTokenStackTLSCapacity = 2, 
                static kTokenless = 1, 
                static tls_lastTokenlessSlot = 12, 
                static tls_lastDeferredReaderSlot = 12, 
                static deferredReaders = {{
                    <std::__atomic_base<unsigned long>> = {
                      static _S_alignment = 8, 
                      _M_i = 0
                    }, 
                    members of std::atomic<unsigned long>: 
                    static is_always_lock_free = true
                  } <repeats 2048 times>}
              }
            }, 
            runOnceCallbacks_ = 0x0, 
            stop_ = {
              _M_base = {
                static _S_alignment = 1, 
                _M_i = false
              }, 
              static is_always_lock_free = true
            }, 
            loopThread_ = {
              static _S_min_alignment = 8, 
              static _S_alignment = 8, 
              _M_i = {
                _M_thread = 140609674241792
              }, 
              static is_always_lock_free = <error reading variable: No global symbol "std::atomic<std::thread::id>::is_always_lock_free".>
            }, 
            queue_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::NotificationQueue<folly::Function<void()> >*, std::default_delete<folly::NotificationQueue<folly::Function<void()> > > >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::NotificationQueue<folly::Function<void()> > > >> = {
                      <std::_Head_base<1, std::default_delete<folly::NotificationQueue<folly::Function<void()> > >, true>> = {
                        <std::default_delete<folly::NotificationQueue<folly::Function<void()> > >> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::NotificationQueue<folly::Function<void()> >*, false>> = {
                      _M_head_impl = 0x7fe241f07a00
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            fnRunner_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::EventBase::FunctionRunner*, std::default_delete<folly::EventBase::FunctionRunner> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::EventBase::FunctionRunner> >> = {
                      <std::_Head_base<1, std::default_delete<folly::EventBase::FunctionRunner>, true>> = {
                        <std::default_delete<folly::EventBase::FunctionRunner>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::EventBase::FunctionRunner*, false>> = {
                      _M_head_impl = 0x7fe24305cb00
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            loopKeepAliveCount_ = 1, 
            loopKeepAliveCountAtomic_ = {
              <std::__atomic_base<long>> = {
                static _S_alignment = 8, 
                _M_i = 0
              }, 
              members of std::atomic<long>: 
              static is_always_lock_free = true
            }, 
            loopKeepAliveActive_ = true, 
            maxLatency_ = {
              __r = 0
            }, 
            avgLoopTime_ = {
              expCoeff_ = -4.9999999999999998e-07, 
              value_ = 32.479999009351381, 
              buffer_time_ = {
                __r = 2875
              }, 
              busy_buffer_ = {
                __r = 25
              }, 
              buffer_cnt_ = 10, 
              static buffer_interval_ = {
                __r = 10
              }
            }, 
            maxLatencyLoopTime_ = {
              expCoeff_ = -4.9999999999999998e-07, 
              value_ = 32.479999009351381, 
              buffer_time_ = {
                __r = 2875
              }, 
              busy_buffer_ = {
                __r = 25
              }, 
              buffer_cnt_ = 10, 
              static buffer_interval_ = {
                __r = 10
              }
            }, 
            maxLatencyCob_ = {
              <folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, 
              members of folly::Function<void()>: 
              data_ = {
                big = 0x0, 
                tiny = {
                  __data = '\000' <repeats 47 times>, 
                  __align = {<No data fields>}
                }
              }, 
              call_ = 0x4664dd <folly::detail::function::FunctionTraits<void ()>::uninitCall(folly::detail::function::Data&)>, 
              exec_ = 0x0
            }, 
            enableTimeMeasurement_ = true, 
            nextLoopCnt_ = 8046663, 
            latestLoopCnt_ = 8046662, 
            startWork_ = {
              __d = {
                __r = 9770378904804382
              }
            }, 
            invokingLoop_ = true, 
            observer_ = {
              <std::__shared_ptr<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2>> = {
                <std::__shared_ptr_access<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
                members of std::__shared_ptr<folly::EventBaseObserver, (__gnu_cxx::_Lock_policy)2>: 
                _M_ptr = 0x0, 
                _M_refcount = {
                  _M_pi = 0x0
                }
              }, <No data fields>}, 
            observerSampleCount_ = 0, 
            executionObserver_ = 0x0, 
            name_ = {
              static npos = 18446744073709551615, 
              _M_dataplus = {
                <std::allocator<char>> = {
                  <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                members of std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider: 
                _M_p = 0x7fe241f581c8 ""
              }, 
              _M_string_length = 0, 
              {
                _M_local_buf = '\000' <repeats 15 times>, 
                _M_allocated_capacity = 0
              }
            }, 
            localStorage_ = {
              _M_h = {
                <std::__detail::_Hashtable_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<false, false, true> >> = {
                  <std::__detail::_Hash_code_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::__detail::_Select1st, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, false>> = {
                    <std::__detail::_Hashtable_ebo_helper<0, std::__detail::_Select1st, true>> = {
                      <std::__detail::_Select1st> = {<No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<1, std::hash<unsigned long>, true>> = {
                      <std::hash<unsigned long>> = {
                        <std::__hash_base<unsigned long, unsigned long>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<2, std::__detail::_Mod_range_hashing, true>> = {
                      <std::__detail::_Mod_range_hashing> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                  <std::__detail::_Hashtable_ebo_helper<0, std::equal_to<unsigned long>, true>> = {
                    <std::equal_to<unsigned long>> = {
                      <std::binary_function<unsigned long, unsigned long, bool>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                <std::__detail::_Map_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, true>> = {<No data fields>}, 
                <std::__detail::_Insert<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, false>> = {
                  <std::__detail::_Insert_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >> = {<No data fields>}, <No data fields>}, 
                <std::__detail::_Rehash_base<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, std::integral_constant<bool, true> >> = {<No data fields>}, 
                <std::__detail::_Equality<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true>, true>> = {<No data fields>}, 
                <std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> > >> = {
                  <std::__detail::_Hashtable_ebo_helper<0, std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >, true>> = {
                    <std::allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >> = {
                      <__gnu_cxx::new_allocator<std::__detail::_Hash_node<std::pair<unsigned long const, std::shared_ptr<void> >, false> >> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                members of std::_Hashtable<unsigned long, std::pair<unsigned long const, std::shared_ptr<void> >, std::allocator<std::pair<unsigned long const, std::shared_ptr<void> > >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >: 
                _M_buckets = 0x7fe241f58208, 
                _M_bucket_count = 1, 
                _M_before_begin = {
                  _M_nxt = 0x0
                }, 
                _M_element_count = 0, 
                _M_rehash_policy = {
                  static _S_growth_factor = 2, 
                  _M_max_load_factor = 1, 
                  _M_next_resize = 0
                }, 
                _M_single_bucket = 0x0
              }
            }, 
            localStorageToDtor_ = {
              _M_h = {
                <std::__detail::_Hashtable_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<false, true, true> >> = {
                  <std::__detail::_Hash_code_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::__detail::_Identity, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, false>> = {
                    <std::__detail::_Hashtable_ebo_helper<0, std::__detail::_Identity, true>> = {
                      <std::__detail::_Identity> = {<No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<1, std::hash<folly::detail::EventBaseLocalBaseBase*>, true>> = {
                      <std::hash<folly::detail::EventBaseLocalBaseBase*>> = {
                        <std::__hash_base<unsigned long, folly::detail::EventBaseLocalBaseBase*>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::__detail::_Hashtable_ebo_helper<2, std::__detail::_Mod_range_hashing, true>> = {
                      <std::__detail::_Mod_range_hashing> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                  <std::__detail::_Hashtable_ebo_helper<0, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, true>> = {
                    <std::equal_to<folly::detail::EventBaseLocalBaseBase*>> = {
                      <std::binary_function<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, bool>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                <std::__detail::_Map_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {<No data fields>}, 
                <std::__detail::_Insert<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {
                  <std::__detail::_Insert_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true> >> = {<No data fields>}, <No data fields>}, 
                <std::__detail::_Rehash_base<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, std::integral_constant<bool, true> >> = {<No data fields>}, 
                <std::__detail::_Equality<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true>, true>> = {<No data fields>}, 
                <std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> > >> = {
                  <std::__detail::_Hashtable_ebo_helper<0, std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >, true>> = {
                    <std::allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >> = {
                      <__gnu_cxx::new_allocator<std::__detail::_Hash_node<folly::detail::EventBaseLocalBaseBase*, false> >> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, 
                members of std::_Hashtable<folly::detail::EventBaseLocalBaseBase*, folly::detail::EventBaseLocalBaseBase*, std::allocator<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Identity, std::equal_to<folly::detail::EventBaseLocalBaseBase*>, std::hash<folly::detail::EventBaseLocalBaseBase*>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true> >: 
                _M_buckets = 0x7fe241f58240, 
                _M_bucket_count = 1, 
                _M_before_begin = {
                  _M_nxt = 0x0
                }, 
                _M_element_count = 0, 
                _M_rehash_policy = {
                  static _S_growth_factor = 2, 
                  _M_max_load_factor = 1, 
                  _M_next_resize = 0
                }, 
                _M_single_bucket = 0x0
              }
            }, 
            virtualEventBaseInitFlag_ = {
              called_ = {
                _M_base = {
                  static _S_alignment = 1, 
                  _M_i = false
                }, 
                static is_always_lock_free = true
              }, 
              mutex_ = {
                static kReaderPriority = false, 
                state_ = {
                  <std::__atomic_base<unsigned int>> = {
                    static _S_alignment = 4, 
                    _M_i = 0
                  }, 
                  members of std::atomic<unsigned int>: 
                  static is_always_lock_free = true
                }, 
                static kIncrHasS = 2048, 
                static kHasS = 4294965248, 
                static kAnnotationCreated = 1024, 
                static kMayDefer = 512, 
                static kPrevDefer = 256, 
                static kHasE = 128, 
                static kBegunE = 64, 
                static kHasU = 32, 
                static kHasSolo = 224, 
                static kWaitingNotS = 16, 
                static kWaitingESingle = 4, 
                static kWaitingEMultiple = 8, 
                static kWaitingE = 12, 
                static kWaitingU = 2, 
                static kWaitingS = 1, 
                static kWaitingAny = 31, 
                static kNumSharedToStartDeferring = 2, 
                static kMaxSpinCount = 1000, 
                static kMaxSoftYieldCount = 1000, 
                static kDeferredSearchDistance = 2, 
                static kDeferredSeparationFactor = 4, 
                static kTokenStackTLSCapacity = 2, 
                static kTokenless = 1, 
                static tls_lastTokenlessSlot = 12, 
                static tls_lastDeferredReaderSlot = 12, 
                static deferredReaders = {{
                    <std::__atomic_base<unsigned long>> = {
                      static _S_alignment = 8, 
                      _M_i = 0
                    }, 
                    members of std::atomic<unsigned long>: 
                    static is_always_lock_free = true
                  } <repeats 2048 times>}
              }
            }, 
            virtualEventBase_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::VirtualEventBase*, std::default_delete<folly::VirtualEventBase> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::VirtualEventBase> >> = {
                      <std::_Head_base<1, std::default_delete<folly::VirtualEventBase>, true>> = {
                        <std::default_delete<folly::VirtualEventBase>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::VirtualEventBase*, false>> = {
                      _M_head_impl = 0x0
                    }, <No data fields>}, <No data fields>}
              }
            }, 
            evb_ = {
              _M_t = {
                _M_t = {
                  <std::_Tuple_impl<0, folly::EventBaseBackendBase*, std::default_delete<folly::EventBaseBackendBase> >> = {
                    <std::_Tuple_impl<1, std::default_delete<folly::EventBaseBackendBase> >> = {
                      <std::_Head_base<1, std::default_delete<folly::EventBaseBackendBase>, true>> = {
                        <std::default_delete<folly::EventBaseBackendBase>> = {<No data fields>}, <No data fields>}, <No data fields>}, 
                    <std::_Head_base<0, folly::EventBaseBackendBase*, false>> = {
                      _M_head_impl = 0x7fe243026480
                    }, <No data fields>}, <No data fields>}
              }
            }
          }, 
          mutex = {
            <std::__mutex_base> = {
              _M_mutex = {
                __data = {
                  __lock = 0, 
                  __count = 0, 
                  __owner = 0, 
                  __nusers = 0, 
                  __kind = 0, 
                  __spins = 0, 
                  __elision = 0, 
                  __list = {
                    __prev = 0x0, 
                    __next = 0x0
                  }
                }, 
                __size = '\000' <repeats 39 times>, 
                __align = 0
              }
            }, <No data fields>}, 
          index = 0, 
          subdoc_op = {
            m_path = 0x7fe241f4c500, 
            m_jsn = 0x143d820, 
            m_match = {
              type = 0, 
              status = 0, 
              matchres = 0, 
              sflags = 0, 
              match_level = 0, 
              position = 0, 
              num_siblings = 0, 
              num_children = 0, 
              immediate_parent_found = 0 '\000', 
              get_last = 0 '\000', 
              extra_options = Subdoc::Match::GET_MATCH_ONLY, 
              unique_item_found = 0 '\000', 
              loc_deepest = {
                at = 0x0, 
                length = 0
              }, 
              loc_key = {
                at = 0x0, 
                length = 0
              }, 
              ensure_unique = {
                at = 0x0, 
                length = 0
              }
            }, 
            m_optype = {
              code = 0 '\000'
            }, 
            m_doc = {
              at = 0x0, 
              length = 0
            }, 
            m_userval = {
              at = 0x0, 
              length = 0
            }, 
            m_result = 0x0
          }, 
          validator = {
            instance = {
              state = 5, 
              stack = {
                <std::stack<JSON_checker::Modes, std::deque<JSON_checker::Modes, std::allocator<JSON_checker::Modes> > >> = {
                  c = {
                    <std::_Deque_base<JSON_checker::Modes, std::allocator<JSON_checker::Modes> >> = {
                      _M_impl = {
                        <std::allocator<JSON_checker::Modes>> = {
                          <__gnu_cxx::new_allocator<JSON_checker::Modes>> = {<No data fields>}, <No data fields>}, 
                        <std::_Deque_base<JSON_checker::Modes, std::allocator<JSON_checker::Modes> >::_Deque_impl_data> = {
                          _M_map = 0x7fe241e87d80, 
                          _M_map_size = 8, 
                          _M_start = {
                            _M_cur = 0x7fe243041200, 
                            _M_first = 0x7fe243041200, 
                            _M_last = 0x7fe243041400, 
                            _M_node = 0x7fe241e87d98
                          }, 
                          _M_finish = {
                            _M_cur = 0x7fe243041201, 
                            _M_first = 0x7fe243041200, 
                            _M_last = 0x7fe243041400, 
                            _M_node = 0x7fe241e87d98
                          }
                        }, <No data fields>}
                    }, <No data fields>}
                }, <No data fields>}
            }
          }, 
          running = {
            _M_base = {
              static _S_alignment = 1, 
              _M_i = true
            }, 
            static is_always_lock_free = true
          }, 
          scratch_buffer = {
            _M_elems = '\000' <repeats 2047 times>
          }, 
          shutdown_next_log = 0, 
          new_conn_queue = {
            connections = {
              <folly::SynchronizedBase<folly::Synchronized<std::vector<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >, std::mutex>, (folly::detail::MutexLevel)0>> = {<No data fields>}, 
              members of folly::Synchronized<std::vector<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >, std::mutex>: 
              static nxCopyCtor = <optimized out>, 
              static nxMoveCtor = <optimized out>, 
              datum_ = {
                <std::_Vector_base<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >> = {
                  _M_impl = {
                    <std::allocator<FrontEndThread::ConnectionQueue::Entry>> = {
                      <__gnu_cxx::new_allocator<FrontEndThread::ConnectionQueue::Entry>> = {<No data fields>}, <No data fields>}, 
                    <std::_Vector_base<FrontEndThread::ConnectionQueue::Entry, std::allocator<FrontEndThread::ConnectionQueue::Entry> >::_Vector_impl_data> = {
                      _M_start = 0x0, 
                      _M_finish = 0x0, 
                      _M_end_of_storage = 0x0
                    }, <No data fields>}
                }, <No data fields>}, 
              mutex_ = {
                <std::__mutex_base> = {
                  _M_mutex = {
                    __data = {
                      __lock = 0, 
                      __count = 0, 
                      __owner = 0, 
                      __nusers = 0, 
                      __kind = 0, 
                      __spins = 0, 
                      __elision = 0, 
                      __list = {
                        __prev = 0x0, 
                        __next = 0x0
                      }
                    }, 
                    __size = '\000' <repeats 39 times>, 
                    __align = 0
                  }
                }, <No data fields>}
            }
          }
        }
#7  0x0000000000ba43f9 in run (this=0x7fe241eb36c0) at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:51
No locals.
#8  platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:64
No locals.
#9  0x00007fe245e85ea5 in start_thread (arg=0x7fe23daf6700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe23daf6700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609674241792, 3016376877879321588, 0, 8392704, 0, 140609674241792, -3019617828262976524, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#10 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 9 (Thread 0x7fe2402fb700 (LWP 84462)):
#0  0x00007fe2437bbc3d in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x0000000000ae2f78 in master_thread_run (ctx=0x143cd50) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/prometheus-cpp/prometheus-cpp-prefix/src/prometheus-cpp/3rdparty/civetweb/src/civetweb.c:19291
        tls = {
          is_master = 1, 
          thread_idx = 1, 
          user_ptr = 0x0, 
          alpn_proto = 0x2 <Address 0x2 out of bounds>
        }
        pfd = <optimized out>
        i = <optimized out>
        workerthreadcount = <optimized out>
#2  master_thread (thread_func_param=0x143cd50) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/prometheus-cpp/prometheus-cpp-prefix/src/prometheus-cpp/3rdparty/civetweb/src/civetweb.c:19386
        sa = {
          __sigaction_handler = {
            sa_handler = 0x1, 
            sa_sigaction = 0x1
          }, 
          sa_mask = {
            __val = {0 <repeats 16 times>}
          }, 
          sa_flags = 0, 
          sa_restorer = 0x0
        }
#3  0x00007fe245e85ea5 in start_thread (arg=0x7fe2402fb700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe2402fb700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609716205312, 3016376877879321588, 0, 8392704, 3, 140609716205312, -3019432013482236940, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#4  0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 8 (Thread 0x7fe23fafa700 (LWP 84461)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x0000000000aec00b in consume_socket (thread_index=<optimized out>, sp=0x143beb8, ctx=0x143cd50)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/prometheus-cpp/prometheus-cpp-prefix/src/prometheus-cpp/3rdparty/civetweb/src/civetweb.c:18846
No locals.
#2  worker_thread_run (conn=0x143b5c8) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/prometheus-cpp/prometheus-cpp-prefix/src/prometheus-cpp/3rdparty/civetweb/src/civetweb.c:18987
        ctx = 0x143cd50
        thread_index = <optimized out>
        tls = {
          is_master = 0, 
          thread_idx = 6, 
          user_ptr = 0x0, 
          alpn_proto = 0x0
        }
#3  worker_thread (thread_func_param=0x143b5c8) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/prometheus-cpp/prometheus-cpp-prefix/src/prometheus-cpp/3rdparty/civetweb/src/civetweb.c:19145
        sa = {
          __sigaction_handler = {
            sa_handler = 0x1, 
            sa_sigaction = 0x1
          }, 
          sa_mask = {
            __val = {0 <repeats 16 times>}
          }, 
          sa_flags = 0, 
          sa_restorer = 0x0
        }
#4  0x00007fe245e85ea5 in start_thread (arg=0x7fe23fafa700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe23fafa700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609707812608, 3016376877879321588, 0, 8392704, 3, 140609707812608, -3019613432363949068, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#5  0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 7 (Thread 0x7fe23f2f9700 (LWP 84460)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x0000000000aec00b in consume_socket (thread_index=<optimized out>, sp=0x143b4d0, ctx=0x143cd50)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/prometheus-cpp/prometheus-cpp-prefix/src/prometheus-cpp/3rdparty/civetweb/src/civetweb.c:18846
No locals.
#2  worker_thread_run (conn=0x143abe0) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/prometheus-cpp/prometheus-cpp-prefix/src/prometheus-cpp/3rdparty/civetweb/src/civetweb.c:18987
        ctx = 0x143cd50
        thread_index = <optimized out>
        tls = {
          is_master = 0, 
          thread_idx = 5, 
          user_ptr = 0x0, 
          alpn_proto = 0x0
        }
#3  worker_thread (thread_func_param=0x143abe0) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/prometheus-cpp/prometheus-cpp-prefix/src/prometheus-cpp/3rdparty/civetweb/src/civetweb.c:19145
        sa = {
          __sigaction_handler = {
            sa_handler = 0x1, 
            sa_sigaction = 0x1
          }, 
          sa_mask = {
            __val = {0 <repeats 16 times>}
          }, 
          sa_flags = 0, 
          sa_restorer = 0x0
        }
#4  0x00007fe245e85ea5 in start_thread (arg=0x7fe23f2f9700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe23f2f9700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609699419904, 3016376877879321588, 0, 8392704, 3, 140609699419904, -3019614531338705932, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#5  0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 6 (Thread 0x7fe23e2f7700 (LWP 84424)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
No locals.
#1  0x000000000067afe7 in __gthread_cond_timedwait (__abs_timeout=0x7fe23e2e56b0, __mutex=<optimized out>, __cond=0x7fe241f4c3f8) at /opt/gcc-10.2.0/include/c++/10.2.0/x86_64-pc-linux-gnu/bits/gthr-default.h:872
No locals.
#2  __wait_until_impl<std::chrono::duration<long, std::ratio<1, 1000000000> > > (__lock=..., __lock=..., __atime=<synthetic pointer>, this=0x7fe241f4c3f8) at /opt/gcc-10.2.0/include/c++/10.2.0/condition_variable:232
        __ts = {
          tv_sec = 1639540483, 
          tv_nsec = 617024878
        }
#3  wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (__atime=..., __lock=..., this=0x7fe241f4c3f8) at /opt/gcc-10.2.0/include/c++/10.2.0/condition_variable:141
        __c_entry = {
          __d = {
            __r = 9751038953882885
          }
        }
#4  wait_for<long, std::ratio<1> > (__rtime=..., __rtime=..., __lock=..., this=0x7fe241f4c3f8) at /opt/gcc-10.2.0/include/c++/10.2.0/condition_variable:172
No locals.
#5  AuditImpl::consume_events() () at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/auditd/src/audit.cc:401
        lock = {
          _M_device = 0x7fe241f4c428, 
          _M_owns = true
        }
#6  0x0000000000ba43f9 in run (this=0x7fe241eb33c0) at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:51
No locals.
#7  platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:64
No locals.
#8  0x00007fe245e85ea5 in start_thread (arg=0x7fe23e2f7700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe23e2f7700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609682634496, 3016376877879321588, 0, 8392704, 0, 140609682634496, -3019612331241708556, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#9  0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 5 (Thread 0x7fe23eaf8700 (LWP 84417)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
No locals.
#1  0x00000000005f0d16 in __gthread_cond_timedwait (__abs_timeout=0x7fe23eae6680, __mutex=0x7fe2430495d0, __cond=0x7fe2430495f8) at /opt/gcc-10.2.0/include/c++/10.2.0/x86_64-pc-linux-gnu/bits/gthr-default.h:872
No locals.
#2  __wait_until_impl<std::chrono::duration<long, std::ratio<1, 1000000000> > > (__lock=<synthetic pointer>, __lock=<synthetic pointer>, __atime=<synthetic pointer>, this=0x7fe2430495f8)
    at /opt/gcc-10.2.0/include/c++/10.2.0/condition_variable:232
        __ts = {
          tv_sec = 1639473883, 
          tv_nsec = 576466213
        }
#3  wait_until<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > (__atime=..., __lock=<synthetic pointer>, this=0x7fe2430495f8) at /opt/gcc-10.2.0/include/c++/10.2.0/condition_variable:141
        __c_entry = {
          __d = {
            __r = 9770238913326024
          }
        }
#4  wait_for<long, std::ratio<1, 1000000000> > (__rtime=<synthetic pointer>, __lock=<synthetic pointer>, this=0x7fe2430495f8) at /opt/gcc-10.2.0/include/c++/10.2.0/condition_variable:172
No locals.
#5  ExternalAuthManagerThread::run() () at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/daemon/external_auth_manager_thread.cc:91
        now = <optimized out>
#6  0x0000000000bb9ab3 in Couchbase::Thread::thread_entry() () at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/thread.cc:38
No locals.
#7  0x0000000000ba43f9 in run (this=0x7fe241eb3420) at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:51
No locals.
#8  platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:64
No locals.
#9  0x00007fe245e85ea5 in start_thread (arg=0x7fe23eaf8700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe23eaf8700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609691027200, 3016376877879321588, 0, 8392704, 0, 140609691027200, -3019611232266951692, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#10 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 4 (Thread 0x7fe240afc700 (LWP 84409)):
#0  0x00007fe2437bbc3d in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00000000005ab111 in get_command (buffsize=80, buffer=0x7fe240aea690 "@\006LF\342\177") at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/daemon/stdin_check.cc:57
        fds = {
          fd = 0, 
          events = 1, 
          revents = 0
        }
#2  check_stdin_thread (arg=<optimized out>) at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/daemon/stdin_check.cc:98
        command = "@\006LF\342\177\000\000\001\000\000\000\000\000\000\000\300\006LF\342\177\000\000\060\000\000\000\000\000\000\000\271I\001\000\000\000\000\000\277\347\350E\342\177\000\000\310\005LF\342\177\000\000\000\000\000\000\000\000\000\000`0\353A\342\177\000\000\000\000\000\000\000\000\000"
        call_exit_handler = true
#3  0x0000000000ba43f9 in run (this=0x7fe241eb3060) at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:51
No locals.
#4  platform_thread_wrap(void*) () at /home/couchbase/jenkins/workspace/toy-unix-simple/platform/src/cb_pthreads.cc:64
No locals.
#5  0x00007fe245e85ea5 in start_thread (arg=0x7fe240afc700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe240afc700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609724598016, 3016376877879321588, 0, 8392704, 0, 140609724598016, -3019430914507480076, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#6  0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 3 (Thread 0x7fe2412fd700 (LWP 84408)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
No locals.
#1  0x0000000000b7200a in __gthread_cond_timedwait (__abs_timeout=0x7fe2412eb6b0, __mutex=<optimized out>, __cond=0x7fe243016a48) at /usr/local/include/c++/7.3.0/x86_64-pc-linux-gnu/bits/gthr-default.h:871
No locals.
#2  __wait_until_impl<std::chrono::duration<long, std::ratio<1, 1000000000> > > (__atime=..., __lock=..., this=0x7fe243016a48) at /usr/local/include/c++/7.3.0/condition_variable:166
        __ts = {
          tv_sec = 1639473424, 
          tv_nsec = 62740250
        }
#3  wait_until<std::chrono::duration<long, std::ratio<1, 1000000000> > > (__atime=..., __lock=..., this=0x7fe243016a48) at /usr/local/include/c++/7.3.0/condition_variable:106
No locals.
#4  wait_until<std::chrono::_V2::system_clock, std::chrono::duration<long int, std::ratio<1, 1000000000> >, spdlog::details::periodic_worker::periodic_worker(const std::function<void()>&, std::chrono::seconds)::<lambda()>::<lambda()> > (__p=..., 
    __atime=..., __lock=..., this=0x7fe243016a48) at /usr/local/include/c++/7.3.0/condition_variable:129
No locals.
#5  wait_for<long int, std::ratio<1>, spdlog::details::periodic_worker::periodic_worker(const std::function<void()>&, std::chrono::seconds)::<lambda()>::<lambda()> > (__p=..., __rtime=..., __lock=..., this=0x7fe243016a48)
    at /usr/local/include/c++/7.3.0/condition_variable:145
No locals.
#6  operator() (__closure=0x7fe241e87d08) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/spdlog/spdlog-prefix/src/spdlog/include/spdlog/details/periodic_worker-inl.h:25
        lock = {
          _M_device = 0x7fe243016a20, 
          _M_owns = true
        }
        interval = {
          __r = 1
        }
        callback_fun = {
          <std::_Maybe_unary_or_binary_function<void>> = {<No data fields>}, 
          <std::_Function_base> = {
            static _M_max_size = 16, 
            static _M_max_align = 8, 
            _M_functor = {
              _M_unused = {
                _M_object = 0x112cfc0 <spdlog::details::registry::instance()::s_instance>, 
                _M_const_object = 0x112cfc0 <spdlog::details::registry::instance()::s_instance>, 
                _M_function_pointer = 0x112cfc0 <spdlog::details::registry::instance()::s_instance>, 
                _M_member_pointer = (void (std::_Undefined_class::*)(std::_Undefined_class * const)) 0x112cfc0 <spdlog::details::registry::instance()::s_instance>, this adjustment 140609745091880
              }, 
              _M_pod_data = "\300\317\022\001\000\000\000\000(}\350A\342\177\000"
            }, 
            _M_manager = 0xb56610 <std::_Function_base::_Base_manager<spdlog::details::registry::flush_every(std::chrono::seconds)::<lambda()> >::_M_manager(std::_Any_data &, const std::_Any_data &, std::_Manager_operation)>
          }, 
          members of std::function<void()>: 
          _M_invoker = 0xb57900 <std::_Function_handler<void(), spdlog::details::registry::flush_every(std::chrono::seconds)::<lambda()> >::_M_invoke(const std::_Any_data &)>
        }
        this = 0x7fe243016a10
#7  __invoke_impl<void, spdlog::details::periodic_worker::periodic_worker(const std::function<void()>&, std::chrono::seconds)::<lambda()> > (__f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:60
No locals.
#8  __invoke<spdlog::details::periodic_worker::periodic_worker(const std::function<void()>&, std::chrono::seconds)::<lambda()> > (__fn=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#9  _M_invoke<0> (this=0x7fe241e87d08) at /usr/local/include/c++/7.3.0/thread:234
No locals.
#10 operator() (this=0x7fe241e87d08) at /usr/local/include/c++/7.3.0/thread:243
No locals.
#11 std::thread::_State_impl<std::thread::_Invoker<std::tuple<spdlog::details::periodic_worker::periodic_worker(const std::function<void()>&, std::chrono::seconds)::<lambda()> > > >::_M_run(void) (this=0x7fe241e87d00)
    at /usr/local/include/c++/7.3.0/thread:186
No locals.
#12 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#13 0x00007fe245e85ea5 in start_thread (arg=0x7fe2412fd700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe2412fd700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609732990720, 3016376877879321588, 0, 8392704, 0, 140609732990720, -3019434213579234316, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#14 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 2 (Thread 0x7fe241afe700 (LWP 84407)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
No locals.
#1  0x0000000000b7224a in __gthread_cond_timedwait (__abs_timeout=0x7fe241aec500, __mutex=<optimized out>, __cond=0x7fe24305c438) at /usr/local/include/c++/7.3.0/x86_64-pc-linux-gnu/bits/gthr-default.h:871
No locals.
#2  __wait_until_impl<std::chrono::duration<long, std::ratio<1, 1000000000> > > (__atime=..., __lock=..., this=0x7fe24305c438) at /usr/local/include/c++/7.3.0/condition_variable:166
        __ts = {
          tv_sec = 1639473433, 
          tv_nsec = 577463634
        }
#3  wait_until<std::chrono::duration<long, std::ratio<1, 1000000000> > > (__atime=..., __lock=..., this=0x7fe24305c438) at /usr/local/include/c++/7.3.0/condition_variable:106
No locals.
#4  wait_until<std::chrono::_V2::system_clock, std::chrono::duration<long int, std::ratio<1, 1000000000> >, spdlog::details::mpmc_blocking_queue<T>::dequeue_for(T&, std::chrono::milliseconds) [with T = spdlog::details::async_msg]::<lambda()> > (
    __p=..., __atime=..., __lock=..., this=0x7fe24305c438) at /usr/local/include/c++/7.3.0/condition_variable:129
No locals.
#5  wait_for<long int, std::ratio<1, 1000>, spdlog::details::mpmc_blocking_queue<T>::dequeue_for(T&, std::chrono::milliseconds) [with T = spdlog::details::async_msg]::<lambda()> > (__p=..., __rtime=<synthetic pointer>, __lock=..., 
    this=0x7fe24305c438) at /usr/local/include/c++/7.3.0/condition_variable:145
No locals.
#6  dequeue_for (wait_duration=..., popped_item=..., this=0x7fe24305c410) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/spdlog/spdlog-prefix/src/spdlog/include/spdlog/details/mpmc_blocking_q.h:58
        lock = {
          _M_device = 0x0, 
          _M_owns = false
        }
#7  spdlog::details::thread_pool::process_next_msg_ (this=this@entry=0x7fe24305c410) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/spdlog/spdlog-prefix/src/spdlog/include/spdlog/details/thread_pool-inl.h:99
        incoming_async_msg = {
          <spdlog::details::log_msg_buffer> = {
            <spdlog::details::log_msg> = {
              logger_name = {
                data_ = 0x0, 
                size_ = 0
              }, 
              level = spdlog::level::off, 
              time = {
                __d = {
                  __r = 0
                }
              }, 
              thread_id = 0, 
              color_range_start = 0, 
              color_range_end = 0, 
              source = {
                filename = 0x0, 
                line = 0, 
                funcname = 0x0
              }, 
              payload = {
                data_ = 0x0, 
                size_ = 0
              }
            }, 
            members of spdlog::details::log_msg_buffer: 
            buffer = warning: RTTI symbol not found for class 'fmt::v7::basic_memory_buffer<char, 250ul, std::allocator<char> >'
{
              <fmt::v7::detail::buffer<char>> = {
                _vptr.buffer = 0xc62130 <vtable for fmt::v7::basic_memory_buffer<char, 250ul, std::allocator<char> >+16>, 
                ptr_ = 0x7fe241aec590 "spdlog_file_logger4: Create bucket [GleamBookUsers0] failed - Already exists\":\"127.0.0.1\",\"port\":11209} (System, <ud>@ns_server</ud>) ]]nection\",\"port\":11209} (not authenticated) ]d) ]/ud>) ]enticated"..., 
                size_ = 0, 
                capacity_ = 250
              }, 
              members of fmt::v7::basic_memory_buffer<char, 250, std::allocator<char> >: 
              store_ = "spdlog_file_logger4: Create bucket [GleamBookUsers0] failed - Already exists\":\"127.0.0.1\",\"port\":11209} (System, <ud>@ns_server</ud>) ]]nection\",\"port\":11209} (not authenticated) ]d) ]/ud>) ]enticated"..., 
              alloc_ = {
                <__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}
            }
          }, 
          members of spdlog::details::async_msg: 
          msg_type = spdlog::details::log, 
          worker_ptr = {
            <std::__shared_ptr<spdlog::async_logger, (__gnu_cxx::_Lock_policy)2>> = {
              <std::__shared_ptr_access<spdlog::async_logger, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, 
              members of std::__shared_ptr<spdlog::async_logger, (__gnu_cxx::_Lock_policy)2>: 
              _M_ptr = 0x0, 
              _M_refcount = {
                _M_pi = 0x0
              }
            }, <No data fields>}
        }
#8  0x0000000000b72598 in worker_loop_ (this=0x7fe24305c410) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/spdlog/spdlog-prefix/src/spdlog/include/spdlog/details/thread_pool-inl.h:90
No locals.
#9  operator() (__closure=<optimized out>) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/spdlog/spdlog-prefix/src/spdlog/include/spdlog/details/thread_pool-inl.h:28
        on_thread_start = <optimized out>
        this = <optimized out>
#10 __invoke_impl<void, spdlog::details::thread_pool::thread_pool(size_t, size_t, std::function<void()>)::<lambda()> > (__f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:60
No locals.
#11 __invoke<spdlog::details::thread_pool::thread_pool(size_t, size_t, std::function<void()>)::<lambda()> > (__fn=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#12 _M_invoke<0> (this=<optimized out>) at /usr/local/include/c++/7.3.0/thread:234
No locals.
#13 operator() (this=<optimized out>) at /usr/local/include/c++/7.3.0/thread:243
No locals.
#14 std::thread::_State_impl<std::thread::_Invoker<std::tuple<spdlog::details::thread_pool::thread_pool(size_t, size_t, std::function<void()>)::<lambda()> > > >::_M_run(void) (this=<optimized out>) at /usr/local/include/c++/7.3.0/thread:186
No locals.
#15 0x00007fe24407dd40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#16 0x00007fe245e85ea5 in start_thread (arg=0x7fe241afe700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe241afe700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609741383424, 3016376877879321588, 0, 8392704, 0, 140609741383424, -3019433114604477452, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#17 0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 1 (Thread 0x7fe242bff700 (LWP 84389)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
No locals.
#1  0x00007fe2453935a7 in background_thread_sleep (tsdn=<optimized out>, interval=10000000000, info=<optimized out>) at src/background_thread.c:255
        next_wakeup = {
          ns = 9770384566414682
        }
        ts_wakeup = {
          ns = 1639473429230542000
        }
        ts = {
          tv_sec = 1639473429, 
          tv_nsec = 230542000
        }
        tv = {
          tv_sec = 1639473419, 
          tv_usec = 230542
        }
        before_sleep = {
          ns = 1639473419230542000
        }
#2  background_work_sleep_once (ind=0, info=<optimized out>, tsdn=<optimized out>) at src/background_thread.c:307
        min_interval = 10000000000
        narenas = <optimized out>
#3  background_thread0_work (tsd=0x7fe242bedf30) at src/background_thread.c:452
        created_threads = 0x7fe242bed5a0
        i = <optimized out>
        n_created = <optimized out>
#4  background_work (ind=<optimized out>, tsd=0x7fe242bedf30) at src/background_thread.c:490
        info = <optimized out>
#5  background_thread_entry (ind_arg=<optimized out>) at src/background_thread.c:522
        thread_ind = <optimized out>
#6  0x00007fe245e85ea5 in start_thread (arg=0x7fe242bff700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7fe242bff700
        now = <optimized out>
        unwind_buf = {
          cancel_jmp_buf = {{
              jmp_buf = {140609759213312, 3016376877879321588, 0, 8392704, 0, 140609759213312, -3019426380632628236, -3019424847573228556}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad = {0x0, 0x0, 0x0, 0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#7  0x00007fe2437c68dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.