(gdb) bt full
#0  0x00007f34b2450387 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:55
        resultvar = 0
        pid = 107393
        selftid = 107926
#1  0x00007f34b2451a78 in __GI_abort () at abort.c:90
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x7f34b27e21c0 <_IO_2_1_stderr_>, sa_sigaction = 0x7f34b27e21c0 <_IO_2_1_stderr_>}, sa_mask = {__val = {139864306653737, 0, 139864306172515, 139864332236137, 139864309637568, 
              1, 139864334622536, 139863893300008, 105690557880560, 106583908421456, 106446472314480, 139864334592472, 139864560663607, 106446472314480, 139864332236137, 51638768}}, sa_flags = -1278439040, 
          sa_restorer = 0x7f34b3d6f569}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f34b3ccc195 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  0x0000000000c6104e in backtrace_terminate_handler () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/utilities/terminate_handler.cc:86
No locals.
#4  0x00007f34b3cc9f86 in __cxxabiv1::__terminate (handler=<optimized out>) at /tmp/deploy/gcc-7.3.0/libstdc++-v3/libsupc++/eh_terminate.cc:47
No locals.
#5  0x00007f34b3cc9fd1 in std::terminate () at /tmp/deploy/gcc-7.3.0/libstdc++-v3/libsupc++/eh_terminate.cc:57
No locals.
#6  0x00007f34bccd360f in GlobalTask::execute (this=this@entry=0x61200001a150) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/globaltask.cc:77
No locals.
#7  0x00007f34bcca5fc6 in FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#1}::operator()() const (__closure=0x7f3499ad4830)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/folly_executorpool.cc:167
        runAgain = false
        proxy = @0x60b00090cb80: <error reading variable>
#8  0x00007f34bd5865c6 in operator() (this=0x7f3499ad4830) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:416
        fn = @0x7f3499ad4830: {<folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, data_ = {big = 0x60b00090cb80, tiny = {
              __data = "\200\313\220\000\260`\000\000\000\000\000\000\000\000\000\000\360\355\215\000\260`", '\000' <repeats 25 times>, __align = {<No data fields>}}}, 
          call_ = 0x7f34bcca7880 <folly::detail::function::FunctionTraits<void ()>::callSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#1}>(folly::detail::function::Data&)>, 
          exec_ = 0x7f34bcc8d4d0 <folly::detail::function::execSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#1}>(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data)>}
#9  folly::ThreadPoolExecutor::runTask(std::shared_ptr<folly::ThreadPoolExecutor::Thread> const&, folly::ThreadPoolExecutor::Task&&) (this=0x61e000158480, thread=..., 
    task=<unknown type in /usr/lib/debug/opt/couchbase/lib/libep.so.debug, CU 0x4fc1cd4, DIE 0x50080f0>)
    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 = 13973317689951}}
        stats = {expired = false, waitTime = {__r = 14429149}, runTime = {__r = 0}, enqueueTime = {__d = {__r = 13973303260802}}, requestId = 0}
#10 0x00007f34bd56ea0a in folly::CPUThreadPoolExecutor::threadRun (this=0x61e000158480, 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_ = 0x7f34bd8cbaaf "CPUThreadPoolExecutor", e_ = 0x7f34bd8cbac4 ""}}}}
#11 0x00007f34bd5896e9 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.
#12 __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.
#13 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#14 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#15 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>
#16 0x00007f34bcc92c59 in operator() (this=0x6070008e9380) at /home/couchbase/jenkins/workspace/couchbase-server-unix/server_build/tlm/deps/folly.exploded/include/folly/Function.h:416
        fn = @0x6070008e9380: <error reading variable>
#17 operator() (__closure=0x6070008e9370) 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 0x6070008e9380)>
        priority = <error reading variable priority (Cannot access memory at address 0x6070008e9370)>
#18 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
---Type <return> to continue, or q <return> to quit---
        fn = @0x6070008e9370: <error reading variable>
#19 0x00007f34bcc8d704 in operator() (this=0x60b00005bf90) at /home/couchbase/jenkins/workspace/couchbase-server-unix/server_build/tlm/deps/folly.exploded/include/folly/Function.h:416
        fn = @0x60b00005bf90: <error reading variable>
#20 operator() (__closure=0x60b00005bf90) at /home/couchbase/jenkins/workspace/couchbase-server-unix/server_build/tlm/deps/folly.exploded/include/folly/executors/thread_factory/NamedThreadFactory.h:40
        name = <error reading variable name (Cannot access memory at address 0x60b00005bfd0)>
        func = <error reading variable func (Cannot access memory at address 0x60b00005bf90)>
#21 __invoke_impl<void, folly::NamedThreadFactory::newThread(folly::Func&&)::<lambda()> > (__f=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:60
No locals.
#22 __invoke<folly::NamedThreadFactory::newThread(folly::Func&&)::<lambda()> > (__fn=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#23 _M_invoke<0> (this=0x60b00005bf90) at /usr/local/include/c++/7.3.0/thread:234
No locals.
#24 operator() (this=0x60b00005bf90) at /usr/local/include/c++/7.3.0/thread:243
No locals.
#25 std::thread::_State_impl<std::thread::_Invoker<std::tuple<folly::NamedThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}> > >::_M_run() (this=0x60b00005bf80) at /usr/local/include/c++/7.3.0/thread:186
No locals.
#26 0x00007f34b3cf4dcf in std::execute_native_thread_routine (__p=0x60b00005bf80) 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 = 0x60b00005bf80}, <No data fields>}, <No data fields>}}}
#27 0x00007f34b27efea5 in start_thread (arg=0x7f3499aec700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7f3499aec700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139863893395200, 3926675313971541708, 0, 8392704, 0, 139863893395200, -4028635625244477748, -4028682513847437620}, 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>
#28 0x00007f34b25188dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
(gdb)