(gdb) bt full
#0  0x00007f38441dc387 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:55
        resultvar = 0
        pid = 31188
        selftid = 31247
#1  0x00007f38441dda78 in __GI_abort () at abort.c:90
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x0, sa_sigaction = 0x0}, sa_mask = {__val = {0 <repeats 13 times>, 139877815335424, 139879637983235, 139879641440704}}, sa_flags = 1152588816, sa_restorer = 0x1091c50 <stderr>}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f3844b2763c in __gnu_cxx::__verbose_terminate_handler () at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/libsupc++/vterminate.cc:95
        terminating = false
        t = <optimized out>
#3  0x0000000000b490eb in backtrace_terminate_handler() () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/utilities/terminate_handler.cc:88
No locals.
#4  0x00007f3844b328f6 in __cxxabiv1::__terminate(void (*)()) () at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/libsupc++/eh_terminate.cc:48
No locals.
#5  0x00007f3844b32961 in std::terminate () at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/libsupc++/eh_terminate.cc:58
No locals.
#6  0x00007f3844b32bf4 in __cxxabiv1::__cxa_throw (obj=obj@entry=0x7f37c4000940, tinfo=0x1092230 <typeinfo for std::logic_error>, dest=0x4453d0 <_ZNSt11logic_errorD1Ev@plt>) at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/libsupc++/eh_throw.cc:95
        globals = <optimized out>
        header = 0x7f37c40008c0
#7  0x00000000004a7a37 in VBucket::processSet (this=0x7f37d77ebc60, htRes=..., v=@0x7f37d77ebd68: 0x7f35fdc126d0, itm=..., cas=139877815336016, allowExisting=true, hasMetaData=true, queueItmCtx=..., storeIfStatus=cb::Continue, maybeKeyExists=true)
    at /opt/gcc-10.2.0/include/c++/10.2.0/bits/char_traits.h:357
No locals.
#8  0x00000000007396e4 in VBucket::prepare(Item&, unsigned long, unsigned long*, CookieIface const*, EventuallyPersistentEngine&, CheckConflicts, bool, GenerateBySeqno, GenerateCas, Collections::VB::CachingReadHandle const&) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/vbucket.cc:1946
        htRes = {pending = {lock = {bucketNum = 1761, htLock = {_M_device = 0x7f37f844f370, _M_owns = true}}, value = 0x7f35fdc126d0}, committed = 0x7f358dc694f0, ht = @0x7f37f8448518}
        v = 0x7f35fdc126d0
        hbl = @0x7f37d77ebdd0: {bucketNum = 1761, htLock = {_M_device = 0x7f37f844f370, _M_owns = true}}
        maybeKeyExists = true
        status = <optimized out>
        notifyCtx = {<std::_Optional_base<VBNotifyCtx, true, true>> = {<std::_Optional_base_impl<VBNotifyCtx, std::_Optional_base<VBNotifyCtx, true, true> >> = {<No data fields>}, _M_payload = {<std::_Optional_payload_base<VBNotifyCtx>> = {
                _M_payload = {_M_empty = {<No data fields>}, _M_value = {bySeqno = 0, notifyReplication = false, notifyFlusher = false, syncWrite = No, itemCountDifference = 0}}, 
                _M_engaged = false}, <No data fields>}}, <std::_Enable_copy_move<true, true, true, true, std::optional<VBNotifyCtx> >> = {<No data fields>}, <No data fields>}
        queueItmCtx = {genBySeqno = No, genCas = No, generateDeleteTime = No, trackCasDrift = Yes, 
          durability = {<std::_Optional_base<DurabilityItemCtx, true, true>> = {<std::_Optional_base_impl<DurabilityItemCtx, std::_Optional_base<DurabilityItemCtx, true, true> >> = {<No data fields>}, 
              _M_payload = {<std::_Optional_payload_base<DurabilityItemCtx>> = {_M_payload = {_M_empty = {<No data fields>}, _M_value = {
                      requirementsOrPreparedSeqno = {<std::__detail::__variant::_Variant_base<cb::durability::Requirements, long>> = {<std::__detail::__variant::_Move_assign_base<true, cb::durability::Requirements, long>> = {<std::__detail::__variant::_Copy_assign_base<true, cb::durability::Requirements, long>> = {<std::__detail::__variant::_Move_ctor_base<true, cb::durability::Requirements, long>> = {<std::__detail::__variant::_Copy_ctor_base<true, cb::durability::Requirements, long>> = {<std::__detail::__variant::_Variant_storage<true, cb::durability::Requirements, long>> = {_M_u = {_M_first = {_M_storage = {level = cb::durability::Majority, timeout = {static BucketDefaultVal = 0, static InfinityVal = 65535, value = 65535}}}, _M_rest = {_M_first = {
                                          _M_storage = 139878494879489}, _M_rest = {<No data fields>}}}, 
                                    _M_index = 0 '\000'}, <No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, <std::_Enable_default_constructor<true, std::variant<cb::durability::Requirements, long> >> = {<No data fields>}, <std::_Enable_copy_move<true, true, true, true, std::variant<cb::durability::Requirements, long> >> = {<No data fields>}, <No data fields>}, cookie = 0x7f3842bca400}}, 
                  _M_engaged = true}, <No data fields>}}, <std::_Enable_copy_move<true, true, true, true, std::optional<DurabilityItemCtx> >> = {<No data fields>}, <No data fields>}, preLinkDocumentContext = 0x0, 
          overwritingPrepareSeqno = {<std::_Optional_base<long, true, true>> = {<std::_Optional_base_impl<long, std::_Optional_base<long, true, true> >> = {<No data fields>}, _M_payload = {<std::_Optional_payload_base<long>> = {_M_payload = {
                    _M_empty = {<No data fields>}, _M_value = 65538}, _M_engaged = false}, <No data fields>}}, <std::_Enable_copy_move<true, true, true, true, std::optional<long> >> = {<No data fields>}, <No data fields>}, 
          hcs = {<std::_Optional_base<long, true, true>> = {<std::_Optional_base_impl<long, std::_Optional_base<long, true, true> >> = {<No data fields>}, _M_payload = {<std::_Optional_payload_base<long>> = {_M_payload = {_M_empty = {<No data fields>}, 
                    _M_value = 8057055}, _M_engaged = false}, <No data fields>}}, <std::_Enable_copy_move<true, true, true, true, std::optional<long> >> = {<No data fields>}, <No data fields>}, deduplicate = No}
        ret = <optimized out>
#9  0x0000000000702dea in KVBucket::prepare(Item&, CookieIface const*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/kv_bucket.cc:1801
        cHandle = {<Collections::VB::ReadHandle> = {readLock = {lock_ = 0x7f37f8410838, token_ = {type_ = folly::SharedMutexToken::DEFERRED_SHARED, slot_ = 3}}, manifest = 0x7f37f84107a0}, 
          itr = {<folly::f14::detail::BaseIter<std::pair<CollectionID const, Collections::VB::ManifestEntry> const*, std::pair<CollectionID const, Collections::VB::ManifestEntry>*>> = {<No data fields>}, underlying_ = {itemPtr_ = 0x7f3765813d90, 
              index_ = 0}}, key = {<DocKeyInterface<DocKey>> = {<No data fields>}, buffer = {static npos = <optimized out>, buf = 0x7f362ba633c0 <Address 0x7f362ba633c0 out of bounds>, len = 21}, encoding = Yes}}
        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 = 0x7f37f8448500, _M_refcount = {
              _M_pi = 0x7f37f83bf580}}, <No data fields>}
        rlh = {lock_ = 0x7f37f84486e8, token_ = {type_ = folly::SharedMutexToken::DEFERRED_SHARED, slot_ = 15}}
        rv = cb::success
#10 0x00000000008fe3a6 in PassiveStream::processMessage(MutationConsumerMessage*, PassiveStream::MessageType) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/response.h:478
        delCas = 139877021863944
        meta = {cas = 0, revSeqno = {counter = {_M_elems = "\\\326\266\000\000"}}, flags = 3615408512, exptime = 139877815337440}
        taskToString = {_M_elems = {{static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x7f37d77ec070 "mutation"}, _M_string_length = 8, {
                _M_local_buf = "mutation\000\301~\327\067\177\000", _M_allocated_capacity = 7957695015159100781}}, {static npos = 18446744073709551615, 
              _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x7f37d77ec090 "deletion"}, _M_string_length = 8, {_M_local_buf = "deletion\000X\346E8\177\000", 
                _M_allocated_capacity = 7957695015225681252}}, {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x7f37d77ec0b0 "expiration"}, 
              _M_string_length = 10, {_M_local_buf = "expiration\000E8\177\000", _M_allocated_capacity = 7598805615304013925}}, {static npos = 18446744073709551615, 
              _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x7f37d77ec0d0 "prepare"}, _M_string_length = 7, {_M_local_buf = "prepare\000\364\t\274\000\000\000\000", 
---Type <return> to continue, or q <return> to quit---
                _M_allocated_capacity = 28554735470867056}}}}
        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 = 0x7f37f8448500, _M_refcount = {
              _M_pi = 0x7f37f83bf580}}, <No data fields>}
        consumer = {<std::__shared_ptr<DcpConsumer, (__gnu_cxx::_Lock_policy)2>> = {<std::__shared_ptr_access<DcpConsumer, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, _M_ptr = <optimized out>, _M_refcount = {
              _M_pi = 0x7f37a8335000}}, <No data fields>}
        ret = <optimized out>
        deleteSource = Explicit
        switchComplete = false
#11 0x00000000008fe9c8 in PassiveStream::processPrepare(MutationConsumerMessage*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/passive_stream.cc:761
        result = <optimized out>
#12 0x00000000008fedfb in PassiveStream::processBufferedMessages(unsigned int&, unsigned long) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/passive_stream.cc:493
        ret = cb::success
        response = <synthetic pointer>
        message_bytes = <synthetic pointer>
        seqno = {<std::_Optional_base<long, true, true>> = {<std::_Optional_base_impl<long, std::_Optional_base<long, true, true> >> = {<No data fields>}, _M_payload = {<std::_Optional_payload_base<long>> = {_M_payload = {_M_empty = {<No data fields>}, 
                  _M_value = 116913}, _M_engaged = true}, <No data fields>}}, <std::_Enable_copy_move<true, true, true, true, std::optional<long> >> = {<No data fields>}, <No data fields>}
        lh = {_M_device = 0x7f37f83a8b70, _M_owns = false}
        count = 8
        total_bytes_processed = 74536
        failed = false
        noMem = false
#13 0x00000000008efb02 in DcpConsumer::drainStreamsBufferedItems (this=this@entry=0x7f37a8335080, stream=..., yieldThreshold=10) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/consumer.cc:1270
        rval = all_processed
        bytesProcessed = 0
        iterations = 2
#14 0x00000000008f6107 in DcpConsumer::processBufferedItems() () at /opt/gcc-10.2.0/include/c++/10.2.0/ext/atomicity.h:100
        stream = {<std::__shared_ptr<PassiveStream, (__gnu_cxx::_Lock_policy)2>> = {<std::__shared_ptr_access<PassiveStream, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, _M_ptr = 0x7f37f83a8a10, _M_refcount = {
              _M_pi = 0x7f37f83a8a00}}, <No data fields>}
        process_ret = all_processed
        vbucket = {vbid = 1011}
#15 0x00000000008f9635 in DcpConsumerTask::run (this=0x7f37f8344bb0) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/consumer.cc:84
        phosphor_internal_category_enabled_73 = {_M_b = {_M_p = 0x0}, static is_always_lock_free = <optimized out>}
        phosphor_internal_category_enabled_temp_73 = <optimized out>
        phosphor_internal_tpi_73 = {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_73 = {tpi = 0x107dc60 <DcpConsumerTask::run()::phosphor_internal_tpi_73>, enabled = true, arg1 = {<No data fields>}, arg2 = {<No data fields>}, start = {__d = {__r = 38739895976223104}}}
        consumer = {<std::__shared_ptr<DcpConsumer, (__gnu_cxx::_Lock_policy)2>> = {<std::__shared_ptr_access<DcpConsumer, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, _M_ptr = <optimized out>, _M_refcount = {
              _M_pi = 0x7f37a8335000}}, <No data fields>}
        sleepFor = 0
        state = <optimized out>
#16 0x0000000000ab7749 in GlobalTask::execute(std::basic_string_view<char, std::char_traits<char> >) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/globaltask.cc:98
        guard = {previous = 0x0}
        start = <optimized out>
        runAgain = <optimized out>
#17 0x0000000000ab0e0a in FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}::operator()() const (__closure=0x7f37d77ec650) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:309
        runAgain = <optimized out>
        proxy = @0x7f383c04f920: <error reading variable>
#18 0x0000000000ab8afe in operator() (this=0x7f37d77ec650) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/cancellable_cpu_executor.cc:42
        fn = @0x7f37d77ec650: {<folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, data_ = {big = 0x7f383c04f920, tiny = {
              __data = " \371\004<8\177\000\000@\307~\327\067\177\000\000\000\000\000\000\000\000\000\000@z\027<8\177\000\000\070\004\000\000\000\000\000\000=v\300\000\000\000\000", __align = {<No data fields>}}}, 
          call_ = 0xab1340 <folly::detail::function::FunctionTraits<void ()>::callSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}>(folly::detail::function::Data&)>, 
          exec_ = 0xaaf830 <folly::detail::function::execSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}>(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data)>}
#19 CancellableCPUExecutor::add(GlobalTask*, folly::Function<void ()>)::{lambda()#1}::operator()() const () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/cancellable_cpu_executor.cc:42
        task = {storage_ = {{emptyState = -80 '\260', value = {task = 0x7f37f8344bb0, func = {<folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, data_ = {big = 0x7f383c04f920, tiny = {
                      __data = " \371\004<8\177\000\000@\307~\327\067\177\000\000\000\000\000\000\000\000\000\000@z\027<8\177\000\000\070\004\000\000\000\000\000\000=v\300\000\000\000\000", __align = {<No data fields>}}}, 
                  call_ = 0xab1340 <folly::detail::function::FunctionTraits<void ()>::callSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}>(folly::detail::function::Data&)>, 
                  exec_ = 0xaaf830 <folly::detail::function::execSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}>(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data)>}}}, hasValue = true}}
        this = <optimized out>
#20 0x0000000000c16c10 in operator() (this=0x7f37d77ec840) at /home/couchbase/jenkins/cbdeps-ws/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:416
        fn = @0x7f37d77ec840: {<folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, data_ = {big = 0x7f3842b51c00, tiny = {
              __data = "\000\034\265B8\177\000\000\320\247\371F8\177\000\000\060\000\000\000\000\000\000\000\017z\000\000\000\000\000\000 \001\000\000\000\000\000\000\020\311~\327\067\177\000", __align = {<No data fields>}}}, 
          call_ = 0xab8e80 <folly::detail::function::FunctionTraits<void()>::callSmall<CancellableCPUExecutor::add(GlobalTask*, folly::Func)::<lambda()> >(folly::detail::function::Data &)>, 
          exec_ = 0xab8430 <folly::detail::function::execSmall<CancellableCPUExecutor::add(GlobalTask*, folly::Func)::<lambda()> >(folly::detail::function::Op, folly::detail::function::Data *, folly::detail::function::Data *)>}
#21 folly::ThreadPoolExecutor::runTask(std::shared_ptr<folly::ThreadPoolExecutor::Thread> const&, folly::ThreadPoolExecutor::Task&&) (this=this@entry=0x7f3842b51d00, thread=..., 
    task=task@entry=<unknown type in /usr/lib/debug/opt/couchbase/bin/memcached-7.2.0-5241.x86_64.debug, CU 0xa931924, DIE 0xa9b5859>)
    at /home/couchbase/jenkins/cbdeps-ws/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/ThreadPoolExecutor.cpp:97
---Type <return> to continue, or q <return> to quit---
        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 = 38739895976220137}}
        stats = {expired = false, waitTime = {__r = 3159408}, runTime = {__r = 0}, enqueueTime = {__d = {__r = 38739895973060729}}, requestId = 0}
#22 0x0000000000c016aa in folly::CPUThreadPoolExecutor::threadRun (this=0x7f3842b51d00, thread=...) at /home/couchbase/jenkins/cbdeps-ws/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:265
        task = {storage_ = {{emptyState = 0 '\000', value = {<folly::ThreadPoolExecutor::Task> = {func_ = {<folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, data_ = {big = 0x7f3842b51c00, tiny = {
                        __data = "\000\034\265B8\177\000\000\320\247\371F8\177\000\000\060\000\000\000\000\000\000\000\017z\000\000\000\000\000\000 \001\000\000\000\000\000\000\020\311~\327\067\177\000", __align = {<No data fields>}}}, 
                    call_ = 0xab8e80 <folly::detail::function::FunctionTraits<void()>::callSmall<CancellableCPUExecutor::add(GlobalTask*, folly::Func)::<lambda()> >(folly::detail::function::Data &)>, 
                    exec_ = 0xab8430 <folly::detail::function::execSmall<CancellableCPUExecutor::add(GlobalTask*, folly::Func)::<lambda()> >(folly::detail::function::Op, folly::detail::function::Data *, folly::detail::function::Data *)>}, 
                  enqueueTime_ = {__d = {__r = 38739895973060729}}, expiration_ = {__r = 0}, expireCallback_ = {<folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, data_ = {big = 0x7a0f, tiny = {
                        __data = "\017z\000\000\000\000\000\000\033{\246", '\000' <repeats 13 times>, "_\356\330F8\177\000\000\240\311~\327\067\177\000\000@\206\371F8\177\000", __align = {<No data fields>}}}, call_ = 0x4675df
     <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_ = 139879633652096}}, hasValue = true}}
        guard = {list_ = {forbid = true, prev = 0x0, curr = {name = {static npos = <optimized out>, b_ = 0xcdc553 "CPUThreadPoolExecutor", e_ = 0xcdc568 ""}}}}
#23 0x0000000000c19bc9 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.
#24 __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.
#25 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#26 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#27 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/cbdeps-ws/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#28 0x0000000000ab0b04 in operator() (this=0x7f3842fddec0) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:49
        fn = @0x7f3842fddec0: <error reading variable>
#29 operator() (__closure=0x7f3842fddec0) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:49
        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 = 0x7f37d77ec9a0 "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 0x7f3842fddec0)>
#30 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 = @0x7f3842fddec0: <error reading variable>
#31 0x00007f3844b5bd40 in execute_native_thread_routine () at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/thread.cc:80
No locals.
#32 0x00007f384695dea5 in start_thread (arg=0x7f37d77fe700) at pthread_create.c:307
        __res = <optimized out>
        pd = 0x7f37d77fe700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139877815412480, 7410851363695754356, 0, 8392704, 0, 139877815412480, -7442465631656608652, -7446650140571992972}, 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>
#33 0x00007f38442a4b0d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
(gdb)