gdb) bt full
#0  0x00007f8826806387 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:55
        resultvar = 0
        pid = 7533
        selftid = 7600
#1  0x00007f8826807a78 in __GI_abort () at abort.c:90
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x0, sa_sigaction = 0x0}, sa_mask = {__val = {0 <repeats 16 times>}}, sa_flags = 0, sa_restorer = 0x109ffd0 <stderr>}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f882715163c 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  0x0000000000b53bab in backtrace_terminate_handler() () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/utilities/terminate_handler.cc:88
No locals.
#4  0x00007f882715c8f6 in __cxxabiv1::__terminate(void (*)()) () at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/libsupc++/eh_terminate.cc:48
No locals.
#5  0x00007f882715c961 in std::terminate () at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/libsupc++/eh_terminate.cc:58
No locals.
#6  0x00007f882715cbf4 in __cxxabiv1::__cxa_throw (obj=obj@entry=0x7f8788000980, tinfo=0x10a05b0 <typeinfo for std::logic_error>, dest=0x445400 <_ZNSt11logic_errorD1Ev@plt>) at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/libsupc++/eh_throw.cc:95
        globals = <optimized out>
        header = 0x7f8788000900
#7  0x00000000004c1f61 in CheckpointManager::queueDirty(SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >&, GenerateBySeqno, GenerateCas, PreLinkDocumentContext*, std::function<void (long)>) (this=0x7f8739098e80, qi=..., 
    generateBySeqno=<optimized out>, generateCas=<optimized out>, preLinkDocumentContext=<optimized out>, assignedSeqnoCallback=...) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/checkpoint_manager.cc:915
        msg = {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x7f8737f43900 <Address 0x7f8737f43900 out of bounds>}, _M_string_length = 236, 
          {_M_local_buf = "\354\000\000\000\000\000\000\000`\211\376\245\207\177\000", _M_allocated_capacity = 236}}
        lh = {_M_device = @0x7f8739098f30}
        openCkpt = <optimized out>
        newLastBySeqno = 108800
        result = <optimized out>
        snapStart = <optimized out>
#8  0x000000000073fa09 in VBucket::queueItem(SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >&, VBQueueItemCtx const&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/vbucket.cc:1304
        durLock = {_M_device = 0x7f87390e1a10, _M_owns = true}
        notifyCtx = {bySeqno = 0, notifyReplication = false, notifyFlusher = false, syncWrite = None, itemCountDifference = 0}
#9  0x000000000074003c in VBucket::queueDirty(HashTable::HashBucketLock const&, StoredValue&, VBQueueItemCtx const&) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/vbucket.cc:1394
        durabilityReqs = <optimized out>
        qi = {value = 0x7f86de222580}
        notifyCtx = <optimized out>
#10 0x0000000000848066 in EPVBucket::addNewStoredValue (this=0x7f87390e1600, hbl=..., itm=..., queueItmCtx=..., genRevSeqno=<optimized out>) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_vb.cc:716
        v = 0x7f87379dbba0
#11 0x000000000073a5ca in VBucket::processSetInner(HashTable::FindUpdateResult&, StoredValue*&, Item&, unsigned long, bool, bool, VBQueueItemCtx const&, cb::StoreIfStatus, bool) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/hash_table.h:741
        genRevSeqno = <optimized out>
        committed = <optimized out>
        status = <optimized out>
        notifyCtx = <optimized out>
#12 0x000000000073abb4 in VBucket::processSet(HashTable::FindUpdateResult&, StoredValue*&, Item&, unsigned long, bool, bool, VBQueueItemCtx const&, cb::StoreIfStatus, bool) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/vbucket.cc:3414
No locals.
#13 0x000000000073e084 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:1969
        htRes = {pending = {lock = {bucketNum = 55, htLock = {_M_device = 0x7f873933d140, _M_owns = true}}, value = 0x0}, committed = 0x7f86ba59f470, ht = @0x7f87390e1618}
        v = 0x0
        hbl = @0x7f87a5fe8dd0: {bucketNum = 55, htLock = {_M_device = 0x7f873933d140, _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 = None, 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 = 140222092250881}, _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 da---Type <return> to continue, or q <return> to quit---
ta fields>}, <std::_Enable_copy_move<true, true, true, true, std::variant<cb::durability::Requirements, long> >> = {<No data fields>}, <No data fields>}, cookie = 0x7f8743213b80}}, 
                  _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 = 140220582199301}, _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 = 8080335}, _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>
#14 0x000000000070721a in KVBucket::prepare(Item&, CookieIface const*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/kv_bucket.cc:1832
        cHandle = {<Collections::VB::ReadHandle> = {readLock = {lock_ = 0x7f87393eb538, token_ = {type_ = folly::SharedMutexToken::DEFERRED_SHARED, slot_ = 8}}, manifest = 0x7f87393eb4a0}, 
          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_ = 0x7f8738dede10, 
              index_ = 0}}, key = {<DocKeyInterface<DocKey>> = {<No data fields>}, buffer = {static npos = <optimized out>, buf = 0x7f87384d85a0 <Address 0x7f87384d85a0 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 = 0x7f87390e1600, _M_refcount = {
              _M_pi = 0x7f87393402a0}}, <No data fields>}
        rlh = {lock_ = 0x7f87390e17e8, token_ = {type_ = folly::SharedMutexToken::DEFERRED_SHARED, slot_ = 1}}
        rv = cb::success
#15 0x0000000000907cd6 in PassiveStream::processMessage(MutationConsumerMessage*, PassiveStream::MessageType) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/response.h:478
        delCas = 140218835019784
        meta = {cas = 19, revSeqno = {counter = {_M_elems = "\300OD\000\000"}}, flags = 2758720544, exptime = 4476864}
        taskToString = {_M_elems = {{static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x7f87a5fe9070 "mutation"}, _M_string_length = 8, {
                _M_local_buf = "mutation\000\220\376\245\207\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 = 0x7f87a5fe9090 "deletion"}, _M_string_length = 8, {_M_local_buf = "deletion\000\000\000\000\000\000\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 = 0x7f87a5fe90b0 "expiration"}, 
              _M_string_length = 10, {_M_local_buf = "expiration\000\000\000\000\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 = 0x7f87a5fe90d0 "prepare"}, _M_string_length = 7, {_M_local_buf = "prepare\000\n\000\000\000\000\000\000", 
                _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 = 0x7f87390e1600, _M_refcount = {
              _M_pi = 0x7f87393402a0}}, <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 = 0x7f8738eb1000}}, <No data fields>}
        ret = <optimized out>
        deleteSource = Explicit
        switchComplete = false
#16 0x00000000009082f8 in PassiveStream::processPrepare(MutationConsumerMessage*) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/passive_stream.cc:767
        result = <optimized out>
#17 0x000000000090872b in PassiveStream::processBufferedMessages(unsigned int&, unsigned long) () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/passive_stream.cc:499
        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 = 108800}, _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 = 0x7f8738eaec68, _M_owns = false}
        count = 0
        total_bytes_processed = 0
        failed = false
        noMem = false
#18 0x00000000008f9372 in DcpConsumer::drainStreamsBufferedItems (this=this@entry=0x7f8738eb1080, stream=..., yieldThreshold=10) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/consumer.cc:1276
        rval = all_processed
        bytesProcessed = 0
        iterations = 0
#19 0x00000000008ff937 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 = 0x7f8738eaeb10, _M_refcount = {
              _M_pi = 0x7f8738eaeb00}}, <No data fields>}
        process_ret = all_processed
        vbucket = {vbid = 926}
#20 0x0000000000902ee5 in DcpConsumerTask::run (this=0x7f8739428e10) 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 = 0x108bba0 <DcpConsumerTask::run()::phosphor_internal_tpi_73>, enabled = true, arg1 = {<No data fields>}, arg2 = {<No data fields>}, start = {__d = {__r = 4560615894558794}}}
        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 = 0x7f8738eb1000}}, <No data fields>}
        sleepFor = 0
        state = <optimized out>
#21 0x0000000000ac21b9 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}
---Type <return> to continue, or q <return> to quit---
        start = <optimized out>
        runAgain = <optimized out>
#22 0x0000000000abb89a in FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}::operator()() const (__closure=0x7f87a5fe9650) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:309
        runAgain = <optimized out>
        proxy = @0x7f874318c700: <error reading variable>
#23 0x0000000000ac356e in operator() (this=0x7f87a5fe9650) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/cancellable_cpu_executor.cc:42
        fn = @0x7f87a5fe9650: {<folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, data_ = {big = 0x7f874318c700, tiny = {
              __data = "\000\307\030C\207\177\000\000@\227\376\245\207\177", '\000' <repeats 11 times>, "\236)\030\210\177\000\000\315\003", '\000' <repeats 13 times>, __align = {<No data fields>}}}, 
          call_ = 0xabbdb0 <folly::detail::function::FunctionTraits<void ()>::callSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}>(folly::detail::function::Data&)>, 
          exec_ = 0xaba2c0 <folly::detail::function::execSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}>(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data)>}
#24 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 = 16 '\020', value = {task = 0x7f8739428e10, func = {<folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, data_ = {big = 0x7f874318c700, tiny = {
                      __data = "\000\307\030C\207\177\000\000@\227\376\245\207\177", '\000' <repeats 11 times>, "\236)\030\210\177\000\000\315\003", '\000' <repeats 13 times>, __align = {<No data fields>}}}, 
                  call_ = 0xabbdb0 <folly::detail::function::FunctionTraits<void ()>::callSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#2}>(folly::detail::function::Data&)>, 
                  exec_ = 0xaba2c0 <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>
#25 0x0000000000c216d0 in operator() (this=0x7f87a5fe9840) at /home/couchbase/jenkins/cbdeps-ws/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:416
        fn = @0x7f87a5fe9840: {<folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, data_ = {big = 0x7f8825151c00, tiny = {
              __data = "\000\034\025%\210\177\000\000\320\067\\)\210\177\000\000\060\000\000\000\000\000\000\000\260\035\000\000\000\000\000\000\200\001\000\000\000\000\000\000\020\231\376\245\207\177\000", __align = {<No data fields>}}}, 
          call_ = 0xac38f0 <folly::detail::function::FunctionTraits<void()>::callSmall<CancellableCPUExecutor::add(GlobalTask*, folly::Func)::<lambda()> >(folly::detail::function::Data &)>, 
          exec_ = 0xac2ea0 <folly::detail::function::execSmall<CancellableCPUExecutor::add(GlobalTask*, folly::Func)::<lambda()> >(folly::detail::function::Op, folly::detail::function::Data *, folly::detail::function::Data *)>}
#26 folly::ThreadPoolExecutor::runTask(std::shared_ptr<folly::ThreadPoolExecutor::Thread> const&, folly::ThreadPoolExecutor::Task&&) (this=this@entry=0x7f8825151d00, thread=..., 
    task=task@entry=<unknown type in /usr/lib/debug/opt/couchbase/bin/memcached-7.2.1-5902.x86_64.debug, CU 0xaa39e93, DIE 0xaabddc8>)
    at /home/couchbase/jenkins/cbdeps-ws/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 = 4560615894556432}}
        stats = {expired = false, waitTime = {__r = 7478095}, runTime = {__r = 0}, enqueueTime = {__d = {__r = 4560615887078337}}, requestId = 0}
#27 0x0000000000c0c16a in folly::CPUThreadPoolExecutor::threadRun (this=0x7f8825151d00, 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 = 0x7f8825151c00, tiny = {
                        __data = "\000\034\025%\210\177\000\000\320\067\\)\210\177\000\000\060\000\000\000\000\000\000\000\260\035\000\000\000\000\000\000\200\001\000\000\000\000\000\000\020\231\376\245\207\177\000", __align = {<No data fields>}}}, 
                    call_ = 0xac38f0 <folly::detail::function::FunctionTraits<void()>::callSmall<CancellableCPUExecutor::add(GlobalTask*, folly::Func)::<lambda()> >(folly::detail::function::Data &)>, 
                    exec_ = 0xac2ea0 <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 = 4560615887078337}}, expiration_ = {__r = 0}, expireCallback_ = {<folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, data_ = {big = 0x1db0, tiny = {
                        __data = "\260\035\000\000\000\000\000\000;$\247", '\000' <repeats 13 times>, "_~;)\210\177\000\000pz\374\000\210\177\000\000@\026\\)\210\177\000", __align = {<No data fields>}}}, call_ = 0x466e81
     <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_ = 140222734048992}}, hasValue = true}}
        guard = {list_ = {forbid = true, prev = 0x0, curr = {name = {static npos = <optimized out>, b_ = 0xce87b3 "CPUThreadPoolExecutor", e_ = 0xce87c8 ""}}}}
#28 0x0000000000c24689 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.
#29 __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.
#30 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#31 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#32 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>
#33 0x0000000000abb594 in operator() (this=0x7f88255e6140) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/executor/folly_executorpool.cc:49
        fn = @0x7f88255e6140: <error reading variable>
#34 operator() (__closure=0x7f88255e6140) 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 = 0x7f87a5fe99a0 "NonIoPool0"}, _M_string_length = 10, {_M_local_buf = "NonIoPool0\000\000\000\000\000", _M_allocated_capacity = 8029725099528449870}}}, hasValue = true}}
        func = <error reading variable func (Cannot access memory at address 0x7f88255e6140)>
#35 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 = @0x7f88255e6140: <error reading variable>
#36 0x00007f8827185d40 in execute_native_thread_routine () at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/thread.cc:80
No locals.
#37 0x00007f8828f86ea5 in start_thread (arg=0x7f87a5ffb700) at pthread_create.c:307
        __res = <optimized out>
---Type <return> to continue, or q <return> to quit---
        pd = 0x7f87a5ffb700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140220582311680, 5663787722034432764, 0, 8392704, 0, 140220582311680, -5650158181358974212, -5653845899729777924}, 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>
#38 0x00007f88268ceb0d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
(gdb)