#0  __GI___pthread_mutex_lock (mutex=0x160) at ../nptl/pthread_mutex_lock.c:67
67	../nptl/pthread_mutex_lock.c: No such file or directory.
[Current thread is 1 (LWP 15525)]
(gdb) bt full
#0  __GI___pthread_mutex_lock (mutex=0x160) at ../nptl/pthread_mutex_lock.c:67
        type = <optimized out>
        __PRETTY_FUNCTION__ = "__pthread_mutex_lock"
        id = <optimized out>
#1  0x00000000008fe128 in __gthread_mutex_lock (__mutex=0x160) at /opt/gcc-10.2.0/include/c++/10.2.0/x86_64-pc-linux-gnu/bits/gthr-default.h:749
No locals.
#2  std::mutex::lock (this=0x160) at /opt/gcc-10.2.0/include/c++/10.2.0/bits/std_mutex.h:100
        __e = <optimized out>
        __e = <optimized out>
#3  std::unique_lock<std::mutex>::lock (this=<synthetic pointer>) at /opt/gcc-10.2.0/include/c++/10.2.0/bits/unique_lock.h:138
No locals.
#4  std::unique_lock<std::mutex>::unique_lock (__m=..., this=<synthetic pointer>) at /opt/gcc-10.2.0/include/c++/10.2.0/bits/unique_lock.h:68
No locals.
#5  PassiveStream::moveFlowControlBytes (this=0x0) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/passive_stream.cc:160
        lg = <optimized out>
#6  0x00000000008f7a54 in DcpConsumer::streamEnd (this=0x7f9978b1c880, opaque=36, vbucket=..., status=<optimized out>)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/consumer.cc:453
        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 = 0x0, _M_refcount = {_M_pi = 0x0}}, <No data fields>}
        phosphor_internal_category_enabled_401 = {_M_b = {_M_p = 0x0}, static is_always_lock_free = <optimized out>}
        phosphor_internal_category_enabled_temp_401 = <optimized out>
        phosphor_internal_tpi_401 = {category = 0x0, name = 0x0, type = phosphor::TraceEventType::AsyncStart, argument_names = {_M_elems = {0x0, 0x0}},
          argument_types = {_M_elems = {phosphor::TraceArgumentType::is_bool, phosphor::TraceArgumentType::is_bool}}}
        phosphor_internal_guard_401 = {tpi = 0x1083b20 <DcpConsumer::streamEnd(unsigned int, Vbid, cb::mcbp::DcpStreamEndStatus)::phosphor_internal_tpi_401>,
          enabled = true, arg1 = 901, arg2 = 1, start = {__d = {__r = 3714570191775009}}}
        ufc = {consumer = @0x7f9978b1c880, bytes = 28}
        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 = 0x7f9979b20290, _M_refcount = {_M_pi = 0x7f9979b20280}}, <No data fields>}
        msg = <optimized out>
        res = cb::engine_errc::success
#7  0x00000000006b543b in non-virtual thunk to EventuallyPersistentEngine::stream_end(CookieIface const&, unsigned int, Vbid, cb::mcbp::DcpStreamEndStatus) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_engine.h:236
        Collections::ManifestFile = <optimized out>
        Collections::CollectionEventDebugTag = <optimized out>
        cb::rbac::PrivilegeAccessOk = <optimized out>
        folly::sorted_equivalent = <optimized out>
        Collections::VB::LegacyXattrKey = <optimized out>
        aliveVBStates = {bits = {<std::_Base_bitset<1>> = {_M_w = 0}, <No data fields>}}
        cb::xattr::vattrs::DOCUMENT = <optimized out>
        NoopSeqnoAckCb = {<std::_Maybe_unary_or_binary_function<void, Vbid, long>> = {<std::binary_function<Vbid, long, void>> = {<No data fields>}, <No data fields>}, <std::_Function_base> = {static _M_max_size = 16, static _M_max_align = 8, _M_functor = {_M_unused = {_M_object = 0x0, _M_const_object = 0x0,
                _M_function_pointer = 0x0, _M_member_pointer = NULL}, _M_pod_data = '\000' <repeats 15 times>}, _M_manager = 0x0}, _M_invoker = 0x0}
        cb::xattr::vattrs::XTOC = <optimized out>
        cb::xattr::macros::VALUE_CRC32C = <optimized out>
--Type <RET> for more, q to quit, c to continue without paging--
        magmaShardFile = <optimized out>
        DcpControlKeys::ChangeStreams = <optimized out>
        Collections::DefaultCollectionName = <optimized out>
        cb::NoExpiryLimit = <optimized out>
        Collections::DefaultScopeName = <optimized out>
        nlohmann::(anonymous namespace)::to_json = <optimized out>
        globalBucketLoggerName = {static npos = 18446744073709551615,
          _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x0}, _M_string_length = 0, {
            _M_local_buf = '\000' <repeats 15 times>, _M_allocated_capacity = 0}}
        cb::xattr::vattrs::VBUCKET = <optimized out>
        cb::userdataStartTag = {static npos = 18446744073709551615,
          _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x0}, _M_string_length = 0, {
            _M_local_buf = '\000' <repeats 15 times>, _M_allocated_capacity = 0}}
        Collections::VB::LegacyMaxSeqnoKey = <optimized out>
        Collections::DefaultCollectionIdentifier = <optimized out>
        cb::userdataEndTag = {static npos = 18446744073709551615,
          _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x0}, _M_string_length = 0, {
            _M_local_buf = '\000' <repeats 15 times>, _M_allocated_capacity = 0}}
        std::__ioinit = {static _S_refcount = 0, static _S_synced_with_stdio = true}
        ImmediateCkptDisposer = {<std::_Maybe_unary_or_binary_function<void, boost::container::list<std::unique_ptr<Checkpoint, std::default_delete<Checkpoint> >, void>&&, Vbid const&>> = {<std::binary_function<boost::container::list<std::unique_ptr<Checkpoint, std::default_delete<Checkpoint> >, void>&&, Vbid const&, void>> = {<No data fields>}, <No data fields>}, <std::_Function_base> = {static _M_max_size = 16, static _M_max_align = 8, _M_functor = {_M_unused = {_M_object = 0x0,
                _M_const_object = 0x0, _M_function_pointer = 0x0, _M_member_pointer = NULL}, _M_pod_data = '\000' <repeats 15 times>}, _M_manager = 0x0},
          _M_invoker = 0x0}
        Collections::NoDataLimit = <optimized out>
        Collections::VB::LegacyJSONFormat = <optimized out>
        cb::xattr::macros::CAS = <optimized out>
        NoopSyncWriteCompleteCb = {<std::_Maybe_unary_or_binary_function<void, CookieIface const*, cb::engine_errc>> = {<std::binary_function<CookieIface const*, cb::engine_errc, void>> = {<No data fields>}, <No data fields>}, <std::_Function_base> = {static _M_max_size = 16, static _M_max_align = 8, _M_functor = {_M_unused = {
                _M_object = 0x0, _M_const_object = 0x0, _M_function_pointer = 0x0, _M_member_pointer = NULL}, _M_pod_data = '\000' <repeats 15 times>},
            _M_manager = 0x0}, _M_invoker = 0x0}
        nlohmann::(anonymous namespace)::from_json = <optimized out>
        DcpControlKeys::FlatBuffersSystemEvents = <optimized out>
        Collections::ScopeEventDebugTag = <optimized out>
        folly::sorted_unique = <optimized out>
        cb::rbac::PrivilegeAccessFail = <optimized out>
        cb::xattr::macros::SEQNO = <optimized out>
        Collections::ManifestFileName = <optimized out>
        Collections::DefaultScopeIdentifier = <optimized out>
        cb::rbac::PrivilegeAccessFailNoPrivileges = <optimized out>
        boost::system::detail::cat_holder<void>::generic_category_instance = {<boost::system::error_category> = {
            _vptr.error_category = 0xc5d830 <vtable for boost::system::detail::generic_error_category+16>, id_ = 12874403176081448717}, <No data fields>}
        boost::system::detail::cat_holder<void>::system_category_instance = {<boost::system::error_category> = {
            _vptr.error_category = 0xc5d878 <vtable for boost::system::detail::system_error_category+16>, id_ = 10353725095272636571}, <No data fields>}
--Type <RET> for more, q to quit, c to continue without paging--
        makeExitBorderGuard = {<No data fields>}
        flatbuffers::flatbuffer_version_string = 0xc7616a "FlatBuffers 1.10.0"
#8  0x0000000000598f3f in dcpStreamEnd (cookie=..., opaque=36, vbucket=vbucket@entry=..., status=status@entry=cb::mcbp::DcpStreamEndStatus::Closed)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/daemon/protocol/mcbp/engine_wrapper.cc:699
        connection = <error reading variable>
        dcp = <optimized out>
        ret = <optimized out>
#9  0x000000000063b83b in dcp_stream_end_executor (cookie=...) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/include/memcached/vbucket.h:73
        request = <error reading variable>
        payload = <optimized out>
        ret = <optimized out>
#10 0x000000000060e0cb in Cookie::doExecute (this=0x7f9a20641580)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/include/mcbp/protocol/header.h:110
        header = <error reading variable>
#11 0x000000000060e160 in Cookie::execute (this=this@entry=0x7f9a20641580, useStartTime=useStartTime@entry=true)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/daemon/cookie.cc:168
        ts = <optimized out>
        done = <optimized out>
        te = {__d = {__r = 1}}
#12 0x00000000005ef543 in Connection::executeCommandPipeline (this=0x7f9a48136c80)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/daemon/cookie.h:472
        cookie = <optimized out>
        drainSize = 28
        limit = <optimized out>
        status = <optimized out>
        input = 0x7f9a4b2904a0
        stop = false
        maxActiveCommands = 32
        active = false
        maxSendQueueSize = 41943040
#13 0x00000000005ef7f2 in Connection::executeCommandsCallback (this=0x7f9a48136c80)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/daemon/connection.cc:801
        start = {__d = {__r = 3714570191766861}}
        stop = <optimized out>
        ns = <optimized out>
#14 0x00000000005efe7b in Connection::rw_callback (bev=<optimized out>, ctx=<optimized out>)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/daemon/connection.cc:950
        instance = <optimized out>
        thread = <optimized out>
        phosphor_internal_category_enabled_945 = {_M_b = {_M_p = 0x0}, static is_always_lock_free = <optimized out>}
        phosphor_internal_category_enabled_temp_945 = <optimized out>
        phosphor_internal_tpi_wait_945 = {category = 0xcc802b "mutex", name = 0xc65290 "Connection::rw_callback::threadLock.wait",
          type = phosphor::TraceEventType::Complete, argument_names = {_M_elems = {0xcc1d99 "this", 0xcc8ac2 ""}}, argument_types = {_M_elems = {
              phosphor::TraceArgumentType::is_pointer, phosphor::TraceArgumentType::is_none}}}
--Type <RET> for more, q to quit, c to continue without paging--
        phosphor_internal_tpi_held_945 = {category = 0xcc802b "mutex", name = 0xc65260 "Connection::rw_callback::threadLock.held",
          type = phosphor::TraceEventType::Complete, argument_names = {_M_elems = {0xcc8ac2 "", 0xcc8ac2 ""}}, argument_types = {_M_elems = {
              phosphor::TraceArgumentType::is_pointer, phosphor::TraceArgumentType::is_none}}}
        phosphor_internal_guard_945 = {tpiWait = 0xc65aa0 <Connection::rw_callback(bufferevent*, void*)::phosphor_internal_tpi_wait_945>,
          tpiHeld = 0xc65a60 <Connection::rw_callback(bufferevent*, void*)::phosphor_internal_tpi_held_945>, enabled = true, mutex = @0x7f9a4b487e90, threshold = {
            __r = 10000000}, start = {__d = {__r = 3714570191763135}}, lockedAt = {__d = {__r = 3714570191764921}}, releasedAt = {__d = {__r = 0}}}
#15 0x00007f9a4e0a1d7e in bufferevent_run_deferred_callbacks_unlocked (cb=<optimized out>, arg=0x7f9a20641800)
    at /home/couchbase/jenkins/cbdeps-ws/deps/packages/build/libevent/libevent-prefix/src/libevent/bufferevent.c:208
        readcb = 0x5efd50 <Connection::rw_callback(bufferevent*, void*)>
        cbarg = 0x7f9a48136c80
        bufev_private = 0x7f9a20641800
        bufev = 0x7f9a20641800
#16 0x00007f9a4e0aacf1 in event_process_active_single_queue (base=base@entry=0x7f9a4b28cc00, max_to_process=max_to_process@entry=2147483647,
    endtime=endtime@entry=0x0, activeq=<optimized out>) at /home/couchbase/jenkins/cbdeps-ws/deps/packages/build/libevent/libevent-prefix/src/libevent/event.c:1726
        evcb_cbfinalize = <optimized out>
        ev = 0x0
        evcb = 0x7f9a206419a0
        count = 7
#17 0x00007f9a4e0ab53f in event_process_active (base=0x7f9a4b28cc00)
    at /home/couchbase/jenkins/cbdeps-ws/deps/packages/build/libevent/libevent-prefix/src/libevent/event.c:1789
        activeq = <optimized out>
        i = 0
        c = 0

        tv = {tv_sec = 140300508895376, tv_usec = 140300687968806}
        maxcb = 2147483647
        endtime = 0x0
        limit_after_prio = 2147483647
        activeq = <optimized out>
        i = <optimized out>
        c = <optimized out>
        endtime = <optimized out>
        tv = <optimized out>
        maxcb = <optimized out>
        limit_after_prio = <optimized out>
#18 event_base_loop (base=0x7f9a4b28cc00, flags=1) at /home/couchbase/jenkins/cbdeps-ws/deps/packages/build/libevent/libevent-prefix/src/libevent/event.c:2012
        n = <optimized out>
        evsel = 0x7f9a4e2bec20 <epollops>
        tv = {tv_sec = 1, tv_usec = 3714570188057535}
        tv_p = <optimized out>
        res = <optimized out>
        done = 0
        retval = 0
        __func__ = "event_base_loop"
#19 0x0000000000c24927 in folly::EventBase::loopBody (this=this@entry=0x7f9a4b487c40, flags=flags@entry=0, ignoreKeepAlive=ignoreKeepAlive@entry=false)
--Type <RET> for more, q to quit, c to continue without paging--
    at /home/couchbase/jenkins/cbdeps-ws/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:397
        callbacks = {<boost::intrusive::list_impl<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>, unsigned long, false, void>> = {
static constant_time_size = false,
            static stateful_value_traits = <optimized out>, static has_container_from_iterator = <optimized out>, static safemode_or_autounlink = true,
            data_ = {<boost::intrusive::bhtraits<folly::EventBase::LoopCallback, boost::intrusive::list_node_traits<void*>, (boost::intrusive::link_mode_type)2, boost::intrusive::dft_tag, 1>> = {<boost::intrusive::bhtraits_base<folly::EventBase::LoopCallback, boost::intrusive::list_node<void*>*, boost::intrusive::dft_tag, 1>> = {<No data fields>}, static link_mode = boost::intrusive::auto_unlink}, root_plus_size_ = {<boost::intrusive::detail::size_holder<false, unsigned long, void>> = {

                  static constant_time_size = <optimized out>}, m_header = {<boost::intrusive::list_node<void*>> = {next_ = 0x7f9a41fe9900,
                    prev_ = 0x7f9a41fe9900}, <No data fields>}}}}, <No data fields>}
        message = 0xce2e20 "Your code just tried to loop over an event base from inside another event base loop. Since libevent is not reentrant, this leads to undefined behavior in opt builds. Please fix immediately. For the co"...
        SCOPE_EXIT_STATE13 = {<folly::detail::ScopeGuardImplBase> = {dismissed_ = false}, function_ = {__this = 0x7f9a4b487c40}}
        res = 0
        ranLoopCallbacks = <optimized out>
        blocking = true
        once = false
        prev = {__d = {__r = 3712856760614157}}
        idleStart = {__d = {__r = 3714570190746209}}
        busy = <optimized out>
        idle = <optimized out>
        prevLoopThread = {_M_thread = 0}
#20 0x0000000000c24df6 in folly::EventBase::loop (this=this@entry=0x7f9a4b487c40)
    at /home/couchbase/jenkins/cbdeps-ws/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:315
        guard = {list_ = {forbid = true, prev = 0x0, curr = {name = {static npos = <optimized out>, b_ = 0xce2acb "EventBase", e_ = 0xce2ad4 ""}}}}

#21 0x0000000000c267b6 in folly::EventBase::loopForever (this=this@entry=0x7f9a4b487c40)
    at /home/couchbase/jenkins/cbdeps-ws/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:538
        SCOPE_EXIT_STATE14 = <optimized out>
        SCOPE_EXIT_STATE15 = <optimized out>
        ret = <optimized out>
#22 0x00000000005bbfc9 in worker_libevent (arg=0x7f9a4b487c30) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/daemon/thread.cc:257
        me = <error reading variable>
#23 0x0000000000ba9409 in CouchbaseThread::run (this=0x7f9a4b7b7340) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:51
No locals.
#24 platform_thread_wrap (arg=0x7f9a4b7b7340) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:64
        context = <optimized out>
#25 0x00007f9a4ebdafa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
        ret = <optimized out>
        pd = <optimized out>
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140300508968704, -7970701374105727940, 140721147781022, 140721147781023, 140300508968704, 140300664732720,
                7950791409889823804, 7950819474975214652}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0,
              canceltype = 0}}}
        not_first_call = <optimized out>
#26 0x00007f9a4caa2eff in __init_misc (argc=<optimized out>, argv=0x7f9a41ffb700, envp=0x7f99e41900c8) at init-misc.c:33
--Type <RET> for more, q to quit, c to continue without paging--
        p = <optimized out>
#27 0x0000000000000000 in ?? ()