(gdb) bt full
#0  0x00007f98c8f19387 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:55
        resultvar = 0
        pid = 9145
        selftid = 9545
#1  0x00007f98c8f1aa78 in __GI_abort () at abort.c:90
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x0, sa_sigaction = 0x0}, sa_mask = {__val = {0 <repeats 15 times>, 140294186774976}}, sa_flags = -911785600, sa_restorer = 0x7f9830f5ec38}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f98c9a77195 in __gnu_cxx::__verbose_terminate_handler () at /tmp/deploy/gcc-7.3.0/libstdc++-v3/libsupc++/vterminate.cc:95
        terminating = false
        t = <optimized out>
#3  0x0000000000555632 in backtrace_terminate_handler () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/utilities/terminate_handler.cc:86
No locals.
#4  0x00007f98c9a74f86 in __cxxabiv1::__terminate (handler=<optimized out>) at /tmp/deploy/gcc-7.3.0/libstdc++-v3/libsupc++/eh_terminate.cc:47
No locals.
#5  0x00007f98c9a74fd1 in std::terminate () at /tmp/deploy/gcc-7.3.0/libstdc++-v3/libsupc++/eh_terminate.cc:57
No locals.

#6  0x00007f98cd4862f3 in GlobalTask::execute (this=<optimized out>) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/globaltask.cc:77
No locals.
#7  0x00007f98cd480352 in operator() (__closure=0x7f98827c10c0) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/folly_executorpool.cc:167
        executedAt = <optimized out>
        end = <optimized out>
        scheduleOverhead = <optimized out>
        start = {__d = {__r = 161819714204176}}
        runAgain = false
        proxy = @0x7f98c7a72cb0: <error reading variable>
#8  folly::detail::function::FunctionTraits<void ()>::callSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{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:387
        fn = @0x7f98827c10c0: {__proxy = @0x7f98c7a72cb0}
#9  0x00007f98cd600bd6 in operator() (this=0x7f98827c10c0) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:416
        fn = @0x7f98827c10c0: {<folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, data_ = {big = 0x7f98c7a72cb0, tiny = {
              __data = "\260,\247ǘ\177\000\000\000\000\000\000\000\000\000\000P\322d@\230\177", '\000' <repeats 25 times>, __align = {<No data fields>}}}, 
          call_ = 0x7f98cd480290 <folly::detail::function::FunctionTraits<void ()>::callSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#1}>(folly::detail::function::Data&)>, 
          exec_ = 0x7f98cd47dde0 <folly::detail::function::execSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#1}>(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data)>}
#10 folly::ThreadPoolExecutor::runTask(std::shared_ptr<folly::ThreadPoolExecutor::Thread> const&, folly::ThreadPoolExecutor::Task&&) (this=0x7f98c4293c00, thread=..., 
    task=<unknown type in /usr/lib/debug/opt/couchbase/lib/libep.so.debug, CU 0x30b325e, DIE 0x30f96c6>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/ThreadPoolExecutor.cpp:98
        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 = 161819714202297}}
        stats = {expired = false, waitTime = {__r = 4122674}, runTime = {__r = 0}, enqueueTime = {__d = {__r = 161819710079623}}, requestId = 0}
#11 0x00007f98cd5e90ca in folly::CPUThreadPoolExecutor::threadRun (this=0x7f98c4293c00, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:265
        guard = {list_ = {forbid = true, prev = 0x0, curr = {name = {static npos = <optimized out>, b_ = 0x7f98cd668cfb "CPUThreadPoolExecutor", e_ = 0x7f98cd668d10 ""}}}}
#12 0x00007f98cd603cf9 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 0x00007f98cd47e793 in operator() (this=0x7f98c7bc6fd0) at /home/couchbase/jenkins/workspace/couchbase-server-unix/server_build/tlm/deps/folly.exploded/include/folly/Function.h:416
        fn = @0x7f98c7bc6fd0: <error reading variable>
#18 operator() (__closure=0x7f98c7bc6fc0) at /home/couchbase/jenkins/workspace/couchbase-server-unix/server_build/tlm/deps/folly.exploded/include/folly/executors/thread_factory/PriorityThreadFactory.h:54
        func = <error reading variable func (Cannot access memory at address 0x7f98c7bc6fd0)>
---Type <return> to continue, or q <return> to quit---
        priority = <error reading variable priority (Cannot access memory at address 0x7f98c7bc6fc0)>
#19 folly::detail::function::FunctionTraits<void ()>::callBig<folly::PriorityThreadFactory::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 = @0x7f98c7bc6fc0: <error reading variable>
#20 0x00007f98c9a9fdcf in std::execute_native_thread_routine (__p=0x7f98c4123b20) at /tmp/deploy/gcc-7.3.0/libstdc++-v3/src/c++11/thread.cc:83
        __t = {_M_t = {
            _M_t = {<std::_Tuple_impl<0, std::thread::_State*, std::default_delete<std::thread::_State> >> = {<std::_Tuple_impl<1, std::default_delete<std::thread::_State> >> = {<std::_Head_base<1, std::default_delete<std::thread::_State>, true>> = {<std::default_delete<std::thread::_State>> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0, std::thread::_State*, false>> = {
                  _M_head_impl = 0x7f98c4123b20}, <No data fields>}, <No data fields>}}}
#21 0x00007f98c92b8ea5 in start_thread (arg=0x7f98827da700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7f98827da700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140293001029376, 5744362202976417161, 0, 8392704, 0, 140293001029376, -5726021239465118327, -5725903983503149687}, 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 0x00007f98c8fe18dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
(gdb) 
(gdb)