GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-115.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.
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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-7.1.0-1710.x86_64.debug...done.
done.
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Core was generated by `/opt/couchbase/bin/memcached -C /opt/couchbase/var/lib/couchbase/config/memcach'.
#0  0x00007f4d31e49337 in raise () from /lib64/libc.so.6
#0  0x00007f4d31e49337 in raise () from /lib64/libc.so.6
No symbol table info available.
#1  0x00007f4d31e4aa28 in abort () from /lib64/libc.so.6
No symbol table info available.
#2  0x00007f4d3279463c in __gnu_cxx::__verbose_terminate_handler() [clone .cold] () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#3  0x0000000000afdaeb in backtrace_terminate_handler() ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/utilities/terminate_handler.cc:88
No locals.
#4  0x00007f4d3279f8f6 in __cxxabiv1::__terminate(void (*)()) () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#5  0x00007f4d3279f961 in std::terminate() () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#6  0x00007f4d3279fbf4 in __cxa_throw () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#7  0x0000000000534090 in cb::throwWithTrace<std::underflow_error> (exception=...)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/server_build/tlm/deps/boost.exploded/include/boost/exception/info.hpp:129
No locals.
#8  0x00000000008a93e8 in cb::ThrowExceptionUnderflowPolicy<unsigned long>::underflow ()
    at /opt/gcc-10.2.0/include/c++/10.2.0/bits/char_traits.h:322
No locals.
#9  0x00000000008a9cd8 in fetch_sub (arg=8316312, this=0x7f4cd464bd68)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/checkpoint.cc:818
        current = 8316240
        desired = 18446744073709551544
#10 operator-= (rhs=8316312, this=0x7f4cd464bd68)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/include/platform/non_negative_counter.h:184
No locals.
#11 Checkpoint::MemoryCounter::operator-= (this=0x7f4cd464bd68, size=8316312)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/checkpoint.cc:813
No locals.
#12 0x00000000008ac0d0 in Checkpoint::expelItems(CheckpointIterator<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > > > const&, unsigned long) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/checkpoint.cc:648
        expelledItems = <optimized out>
        dummy = {
          container = {<std::_Reference_wrapper_base_memfun<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > >, false>> = {<std::_Reference_wrapper_base<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > > >> = {<std::_Weak_result_type<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > > >> = {<std::_Weak_result_type_memfun<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > >, false>> = {<std::_Weak_result_type_impl<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > > >> = {<std::_Maybe_get_result_type<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > >, void>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, <std::_Refwrap_base_arg1<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > >, void>> = {<No data fields>}, <std::_Refwrap_base_arg2<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > >, void>> = {<No data fields>}, <No data fields>}, <No data fields>}, _M_data = 0x7f4cd464bcb0}, iter = {
            m_iit = {static stateful_value_traits = false, members_ = {nodeptr_ = <optimized out>}}}}
        first = {
          container = {<std::_Reference_wrapper_base_memfun<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > >, false>> = {<std::_Reference_wrapper_base<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > > >> = {<std::_Weak_result_type<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > > >> = {<std::_Weak_result_type_memfun<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > >, false>> = {<std::_Weak_result_type_impl<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > > >> = {<std::_Maybe_get_result_type<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > >, void>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, <std::_Refwrap_base_arg1<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > >, void>> = {<No data fields>}, <std::_Refwrap_base_arg2<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > >, void>> = {<No data fields>}, <No data fields>}, <No data fields>}, _M_data = 0x7f4cd464bcb0}, iter = {
            m_iit = {static stateful_value_traits = false, members_ = {nodeptr_ = <optimized out>}}}}
#13 0x00000000007c3eba in CheckpointManager::extractItemsToExpel(std::lock_guard<std::mutex> const&) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/checkpoint_manager.cc:1969
        oldestCheckpoint = 0x7f4cd464bc00
        iterator = {
          container = {<std::_Reference_wrapper_base_memfun<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > >, false>> = {<std::_Reference_wrapper_base<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > > >> = {<std::_Weak_result_type<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > > >> = {<std::_Weak_result_type_memfun<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > >, false>> = {<std::_Weak_result_type_impl<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > > >> = {<std::_Maybe_get_result_type<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > >, void>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, <std::_Refwrap_base_arg1<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > >, void>> = {<No data fields>}, <std::_Refwrap_base_arg2<boost::container::list<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > >, void>> = {<No data fields>}, <No data fields>}, <No data fields>}, _M_data = 0x7f4cd464bcb0}, iter = {
            m_iit = {static stateful_value_traits = false, members_ = {nodeptr_ = 0x7f4c7612a4e0}}}}
        distance = 346514
        expelledItems = {<boost::container::dtl::node_alloc_holder<MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > >, boost::intrusive::list_impl<boost::intrusive::bhtraits<boost::container::dtl::list_node<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, void*>, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)0, boost::intrusive::dft_tag, 1>, unsigned long, true, void> >> = {<MemoryTrackingAllocator<boost::container::dtl::list_node<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, void*> >> = {
              bytesAllocated = {<std::__shared_ptr<cb::NonNegativeCounter<unsigned long, cb::ThrowExceptionUnderflowPolicy>, (__gnu_cxx::_Lock_policy)2>> = {<std::__shared_ptr_access<cb::NonNegativeCounter<unsigned long, cb::ThrowExceptionUnderflowPolicy>, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, _M_ptr = 0x7f4c959d11d0, _M_refcount = {_M_pi = 0x7f4c959d11c0}}, <No data fields>}}, m_icont = {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::bhtraits<boost::container::dtl::list_node<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, void*>, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)0, boost::intrusive::dft_tag, 1>> = {<boost::intrusive::bhtraits_base<boost::container::dtl::list_node<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, void*>, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, static link_mode = boost::intrusive::normal_link}, 
                root_plus_size_ = {<boost::intrusive::detail::size_holder<true, unsigned long, void>> = {
                    static constant_time_size = <optimized out>, size_ = 346513}, m_header = {<boost::intrusive::list_node<void*>> = {
                      next_ = 0x7f4c74844300, prev_ = 0x7f4c7612a4e0}, <No data fields>}}}}}, <No data fields>}
        numExpelledItems = <optimized out>
        name = <optimized out>
        pos = <optimized out>
        cursor = {<std::__shared_ptr<CheckpointCursor, (__gnu_cxx::_Lock_policy)2>> = {<std::__shared_ptr_access<CheckpointCursor, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, _M_ptr = 0x7f4c9213ff28, _M_refcount = {_M_pi = 0x7f4c923fc840}}, <No data fields>}
#14 0x00000000007c440b in CheckpointManager::expelUnreferencedCheckpointItems() ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/checkpoint_manager.cc:598
        lh = {_M_device = @0x7f4c922bc6d0}
        extractRes = {
          items = {<boost::container::dtl::node_alloc_holder<MemoryTrackingAllocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > >, boost::intrusive::list_impl<boost::intrusive::bhtraits<boost::container::dtl::list_node<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, void*>, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)0, boost::intrusive::dft_tag, 1>, unsigned long, true, void> >> = {<MemoryTrackingAllocator<boost::container::dtl::list_node<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, void*> >> = {
                bytesAllocated = {<std::__shared_ptr<cb::NonNegativeCounter<unsigned long, cb::ThrowExceptionUnderflowPolicy>, (__gnu_cxx::_Lock_policy)2>> = {<std::__shared_ptr_access<cb::NonNegativeCounter<unsigned long, cb::ThrowExceptionUnderflowPolicy>, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, _M_ptr = 0x7f4c6a174f30, _M_refcount = {_M_pi = 0x7f4c6a174f20}}, <No data fields>}}, m_icont = {
                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::bhtraits<boost::container::dtl::list_node<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, void*>, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)0, boost::intrusive::dft_tag, 1>> = {<boost::intrusive::bhtraits_base<boost::container::dtl::list_node<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, void*>, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, static link_mode = boost::intrusive::normal_link}, 
                  root_plus_size_ = {<boost::intrusive::detail::size_holder<true, unsigned long, void>> = {
                      static constant_time_size = <optimized out>, size_ = 0}, m_header = {<boost::intrusive::list_node<void*>> = {
                        next_ = 0x7f4cd6feb2a8, prev_ = 0x7f4cd6feb2a8}, <No data fields>}}}}}, <No data fields>}, manager = 0x0, 
          expelCursor = {<std::__shared_ptr<CheckpointCursor, (__gnu_cxx::_Lock_policy)2>> = {<std::__shared_ptr_access<CheckpointCursor, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, _M_ptr = 0x0, _M_refcount = {_M_pi = 0x0}}, <No data fields>}, checkpoint = 0x0}
        numItemsExpelled = <optimized out>
        queuedItemsMemReleased = <optimized out>
        estimatedMemRecovered = <optimized out>
#15 0x00000000007c736c in ClosedUnrefCheckpointRemoverTask::attemptItemExpelling() ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/checkpoint_remover.cc:122
        vbid = {vbid = 12}
        vb = {<std::__shared_ptr<VBucket, (__gnu_cxx::_Lock_policy)2>> = {<std::__shared_ptr_access<VBucket, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, _M_ptr = 0x7f4c7eca0300, _M_refcount = {_M_pi = 0x7f4c77eae5c0}}, <No data fields>}
        expelResult = <optimized out>
        it = @0x7f4d14426800: <error reading variable>
        __for_range = @0x7f4cd6feb3a0: {<std::_Vector_base<std::pair<Vbid, unsigned long>, std::allocator<std::pair<Vbid, unsigned long> > >> = {
            _M_impl = {<std::allocator<std::pair<Vbid, unsigned long> >> = {<__gnu_cxx::new_allocator<std::pair<Vbid, unsigned long> >> = {<No data fields>}, <No data fields>}, <std::_Vector_base<std::pair<Vbid, unsigned long>, std::allocator<std::pair<Vbid, unsigned long> > >::_Vector_impl_data> = {_M_start = 0x7f4d14426800, _M_finish = 0x7f4d14426b40, _M_end_of_storage = 0x7f4d14426c00}, <No data fields>}}, <No data fields>}
        bucket = @0x7f4d242be000: <error reading variable>
        vbuckets = {<std::_Vector_base<std::pair<Vbid, unsigned long>, std::allocator<std::pair<Vbid, unsigned long> > >> = {
            _M_impl = {<std::allocator<std::pair<Vbid, unsigned long> >> = {<__gnu_cxx::new_allocator<std::pair<Vbid, unsigned long> >> = {<No data fields>}, <No data fields>}, <std::_Vector_base<std::pair<Vbid, unsigned long>, std::allocator<std::pair<Vbid, unsigned long> > >::_Vector_impl_data> = {_M_start = 0x7f4d14426800, _M_finish = 0x7f4d14426b40, _M_end_of_storage = 0x7f4d14426c00}, <No data fields>}}, <No data fields>}
#16 0x00000000007c83a8 in ClosedUnrefCheckpointRemoverTask::run() ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/checkpoint_remover.cc:256
        phosphor_internal_category_enabled_200 = {_M_b = {_M_p = 0x0}, static is_always_lock_free = <optimized out>}
        phosphor_internal_category_enabled_temp_200 = <optimized out>
        phosphor_internal_tpi_200 = {category = 0x0, name = 0x0, type = phosphor::AsyncStart, argument_names = {_M_elems = {0x0, 0x0}}, 
          argument_types = {_M_elems = {phosphor::is_bool, phosphor::is_bool}}}
        phosphor_internal_guard_200 = {tpi = 0x100a6a0 <ClosedUnrefCheckpointRemoverTask::run()::phosphor_internal_tpi_200>, enabled = true, 
          arg1 = {<No data fields>}, arg2 = {<No data fields>}, start = {__d = {__r = 9562747839036888}}}
        bucket = @0x7f4d242be000: <error reading variable>
        wasAboveBackfillThreshold = false
        bytesToFree = <optimized out>
#17 0x0000000000a6e3a2 in GlobalTask::execute() () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/globaltask.cc:68
        guard = {previous = 0x0}
#18 0x0000000000a6b5b5 in FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}::operator()() const (__closure=0x7f4cd6feb840)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:189
        scheduleOverhead = <optimized out>
        start = {__d = {__r = 9562747839035005}}
        runAgain = false
        proxy = @0x7f4d30dc3ac0: <error reading variable>
#19 0x0000000000bbfe60 in operator() (this=0x7f4cd6feb840)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:416
        fn = @0x7f4cd6feb840: {<folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, data_ = {big = 0x7f4d30dc3ac0, tiny = {
              __data = "\300:\334\060M\177\000\000\000\000\000\000\000\000\000\000\020\005\242\060M\177\000\000\203\275\001\000\000\000\000\000\270\000\000\000\000\000\000\000\020\271\376\326L\177\000", __align = {<No data fields>}}}, 
          call_ = 0xa6bc70 <folly::detail::function::FunctionTraits<void ()>::callSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}>(folly::detail::function::Data&)>, 
          exec_ = 0xa6a3c0 <folly::detail::function::execSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}>(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data)>}
#20 folly::ThreadPoolExecutor::runTask(std::shared_ptr<folly::ThreadPoolExecutor::Thread> const&, folly::ThreadPoolExecutor::Task&&) (
    this=this@entry=0x7f4d30957c00, thread=..., 
    task=task@entry=<unknown type in /usr/lib/debug/opt/couchbase/bin/memcached-7.1.0-1710.x86_64.debug, CU 0xa01a227, DIE 0xa09e15c>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/ThreadPoolExecutor.cpp:97
        rctx = {
          prev_ = {<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>}, _M_ptr = 0x0, _M_refcount = {_M_pi = 0x0}}, <No data fields>}}
        startTime = {__d = {__r = 9562747839030041}}
        stats = {expired = false, waitTime = {__r = 736117}, runTime = {__r = 0}, enqueueTime = {__d = {__r = 9562747838293924}}, requestId = 0}
#21 0x0000000000ba7c1a in folly::CPUThreadPoolExecutor::threadRun (this=0x7f4d30957c00, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:265
        task = {storage_ = {{emptyState = -64 '\300', value = {<folly::ThreadPoolExecutor::Task> = {
                  func_ = {<folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, data_ = {big = 0x7f4d30dc3ac0, tiny = {
                        __data = "\300:\334\060M\177\000\000\000\000\000\000\000\000\000\000\020\005\242\060M\177\000\000\203\275\001\000\000\000\000\000\270\000\000\000\000\000\000\000\020\271\376\326L\177\000", __align = {<No data fields>}}}, 
                    call_ = 0xa6bc70 <folly::detail::function::FunctionTraits<void ()>::callSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}>(folly::detail::function::Data&)>, 
                    exec_ = 0xa6a3c0 <folly::detail::function::execSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}>(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data)>}, enqueueTime_ = {__d = {__r = 9562747838293924}}, 
                  expiration_ = {__r = 0}, expireCallback_ = {<folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, data_ = {
                      big = 0x1bd83, tiny = {
                        __data = "\203\275\001\000\000\000\000\000\253\063\242", '\000' <repeats 13 times>, "_\036\240\064M\177\000\000p\372\276\036M\177\000\000@\266\300\064M\177\000", __align = {<No data fields>}}}, call_ = 0x463c7d
     <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>}, _M_ptr = 0x0, _M_refcount = {_M_pi = 0x0}}, <No data fields>}}, 
                poison = false, priority_ = 0 '\000', queueObserverPayload_ = 139969524417280}}, hasValue = true}}
        guard = {list_ = {forbid = true, prev = 0x0, curr = {name = {static npos = <optimized out>, b_ = 0xc7b90b "CPUThreadPoolExecutor", 
                e_ = 0xc7b920 ""}}}}
#22 0x0000000000bc2e19 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.
#23 __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.
#24 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#25 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#26 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>
#27 0x0000000000a6b244 in operator() (this=0x7f4d30de5040)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:47
        fn = @0x7f4d30de5040: <error reading variable>
#28 operator() (__closure=0x7f4d30de5040) at /home/couchbase/jenkins/workspace/couchbase-server-unix/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>}, 
                  _M_p = 0x7f4cd6feb9a0 "NonIoPool1"}, _M_string_length = 10, {_M_local_buf = "NonIoPool1\000\000\000\000\000", 
                  _M_allocated_capacity = 8029725099528449870}}}, hasValue = true}}
        func = <error reading variable func (Cannot access memory at address 0x7f4d30de5040)>
#29 folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/server_build/tlm/deps/folly.exploded/include/folly/Function.h:401
        fn = @0x7f4d30de5040: <error reading variable>
#30 0x00007f4d327c8d40 in execute_native_thread_routine () from /opt/couchbase/bin/../lib/libstdc++.so.6
No symbol table info available.
#31 0x00007f4d345d0e65 in start_thread () from /lib64/libpthread.so.0
No symbol table info available.
#32 0x00007f4d31f1188d in clone () from /lib64/libc.so.6
No symbol table info available.