Memcached crashed at cb::AtomicNonNegativeCounter<unsigned long, cb::ClampAtZeroUnderflowPolicy>::load (this=<error reading variable: Cannot access memory at address 0x0>)

(gdb) bt

#0  0x00000000007d5a74 in std::__atomic_base<unsigned long>::load (__m=std::memory_order_relaxed, this=<error reading variable: Cannot access memory at address 0x0>)

    at /opt/gcc-10.2.0/include/c++/10.2.0/bits/atomic_base.h:426

#1  cb::AtomicNonNegativeCounter<unsigned long, cb::ClampAtZeroUnderflowPolicy>::load (this=<error reading variable: Cannot access memory at address 0x0>)

    at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/include/platform/non_negative_counter.h:235

#2  cb::AtomicNonNegativeCounter<unsigned long, cb::ClampAtZeroUnderflowPolicy>::operator unsigned long (

    this=<error reading variable: Cannot access memory at address 0x0>)

    at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/include/platform/non_negative_counter.h:231

#3  Collections::VB::ManifestEntry::getItemCount (this=<error reading variable: Cannot access memory at address 0x0>)

    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/collections/vbucket_manifest_entry.h:110

#4  Collections::VB::StatsReadHandle::getItemCount (this=this@entry=0x7f55df7eb450)

    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/collections/vbucket_manifest_handles.cc:39

#5  0x00000000008e2e7d in operator() (__closure=<optimized out>)

    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/active_stream.cc:1915

#6  ActiveStream::tryAndScheduleOSOBackfill (this=0x7f5556486090, producer=..., vb=...)

    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/active_stream.cc:1916

#7  0x00000000008e572c in ActiveStream::scheduleBackfill_UNLOCKED (this=<optimized out>, producer=..., reschedule=<optimized out>)

    at /opt/gcc-10.2.0/include/c++/10.2.0/bits/shared_ptr_base.h:1324

#8  0x00000000008e6452 in ActiveStream::transitionState (this=0x7f5556486090, newState=ActiveStream::StreamState::Backfilling)

    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/active_stream.cc:2238

#9  0x00000000008f1b1d in ActiveStream::setActive (this=0x7f5556486090)

    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/active_stream.h:138

#10 0x000000000080c5a3 in DcpProducer::streamRequest(unsigned int, unsigned int, Vbid, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long*, std::function<cb::engine_errc (std::vector<vbucket_failover_t, std::allocator<vbucket_failover_t> > const&)>, std::optional<std::basic_string_view<char, std::char_traits<char> > >) (this=this@entry=0x7f5560ae4280, flags=flags@entry=16, opaque=opaque@entry=2768372744, vbucket=vbucket@entry=...,

    start_seqno=start_seqno@entry=0, end_seqno=end_seqno@entry=18446744073709551615, vbucket_uuid=<optimized out>, snap_start_seqno=<optimized out>,

    snap_end_seqno=<optimized out>, rollback_seqno=<optimized out>, callback=..., json=...)

    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/producer.cc:577

#11 0x00000000006bacd6 in EventuallyPersistentEngine::stream_req(CookieIface const&, unsigned int, unsigned int, Vbid, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long*, std::function<cb::engine_errc (std::vector<vbucket_failover_t, std::allocator<vbucket_failover_t> > const&)>, std::optional<std::basic_string_view<char, std::char_traits<char> > >) (this=<optimized out>, cookie=..., flags=16, opaque=2768372744, vbucket=..., startSeqno=0,

    endSeqno=18446744073709551615, vbucketUuid=0, snapStartSeqno=0, snapEndSeqno=0, rollbackSeqno=0x7f55df7ec028, callback=..., json=...)

    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_engine.cc:1310

#12 0x000000000059e65b in dcpStreamReq(Cookie&, unsigned int, unsigned int, Vbid, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long*, std::function<cb::engine_errc (std::vector<vbucket_failover_t, std::allocator<vbucket_failover_t> > const&)>, std::optional<std::basic_string_view<char, std::char_traits<char> > >) (cookie=..., flags=flags@entry=16, opaque=2768372744, vbucket=vbucket@entry=..., startSeqno=startSeqno@entry=0,

    endSeqno=endSeqno@entry=18446744073709551615, vbucketUuid=0, snapStartSeqno=0, snapEndSeqno=0, rollbackSeqno=0x7f55df7ec028, callback=..., json=...)

    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/daemon/protocol/mcbp/engine_wrapper.cc:724

#13 0x00000000006411d8 in dcp_stream_req_executor (cookie=...)

    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/daemon/protocol/mcbp/dcp_stream_req_executor.cc:59

#14 0x000000000061361b in Cookie::doExecute (this=0x7f55eccd0080)

    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/include/mcbp/protocol/header.h:110

#15 0x00000000006136b0 in Cookie::execute (this=this@entry=0x7f55eccd0080, useStartTime=useStartTime@entry=true)

    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/daemon/cookie.cc:168

#16 0x00000000005f4bd3 in Connection::executeCommandPipeline (this=0x7f55f0c4d580)

--Type <RET> for more, q to quit, c to continue without paging--

    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/daemon/connection.cc:577

#17 0x00000000005f4e82 in Connection::executeCommandsCallback (this=0x7f55f0c4d580)

    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/daemon/connection.cc:801

#18 0x00000000005f550b in Connection::rw_callback (bev=<optimized out>, ctx=<optimized out>)

    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/daemon/connection.cc:950

#19 0x00007f55f31efd7e in bufferevent_run_deferred_callbacks_unlocked (cb=<optimized out>, arg=0x7f55ecdde000)

    at /home/couchbase/jenkins/cbdeps-ws/deps/packages/build/libevent/libevent-prefix/src/libevent/bufferevent.c:208

#20 0x00007f55f31f8cf1 in event_process_active_single_queue (base=base@entry=0x7f55f0c66c00, 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

#21 0x00007f55f31f953f in event_process_active (base=0x7f55f0c66c00)

    at /home/couchbase/jenkins/cbdeps-ws/deps/packages/build/libevent/libevent-prefix/src/libevent/event.c:1789

#22 event_base_loop (base=0x7f55f0c66c00, flags=1) at /home/couchbase/jenkins/cbdeps-ws/deps/packages/build/libevent/libevent-prefix/src/libevent/event.c:2012

#23 0x0000000000c2f3f7 in folly::EventBase::loopBody (this=this@entry=0x7f55f0c3ac40, flags=flags@entry=0, ignoreKeepAlive=ignoreKeepAlive@entry=false)

    at /home/couchbase/jenkins/cbdeps-ws/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:397

#24 0x0000000000c2f8c6 in folly::EventBase::loop (this=this@entry=0x7f55f0c3ac40)

    at /home/couchbase/jenkins/cbdeps-ws/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:315

#25 0x0000000000c31286 in folly::EventBase::loopForever (this=this@entry=0x7f55f0c3ac40)

    at /home/couchbase/jenkins/cbdeps-ws/deps/packages/build/folly/folly-prefix/src/folly/folly/io/async/EventBase.cpp:538

#26 0x00000000005c16f9 in worker_libevent (arg=0x7f55f0c3ac30) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/daemon/thread.cc:257

#27 0x0000000000bb3ed9 in CouchbaseThread::run (this=0x7f55f0c220a0) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:51

#28 platform_thread_wrap (arg=0x7f55f0c220a0) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:64

#29 0x00007f55f3d28ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

#30 0x00007f55f1f8aa2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

guides/gradlew --refresh-dependencies testrunner -P jython=/opt/jython/bin/jython -P 'args=-i /data/workspace/debian-p0-collections-vset00-00-dcp_oso_backfill_7.2_P1_majority/testexec.11104.ini GROUP=OSO_DCP_BACKFILL_P0,get-cbcollect-info=True,infra_log_level=info,log_level=info,bucket_storage=couchstore,upgrade_version=7.2.3-6705,sirius_url=http://172.23.120.103:4000 -t bucket_collections.oso_backfill_test.KvOsoBackfillTests.test_dcp_backfill_config,nodes_init=6,replicas=1,num_items=5000,load_collections_exponentially=True,services_init=kv-kv-kv-index-index-index:n1ql,bucket_spec=multi_bucket.buckets_with_similar_hierarchy,oso_dcp_backfill=auto,simulate_error=kill_memcached,kv_quota_percent=100,index_quota_percent=100,err_itrs=20,GROUP=OSO_DCP_BACKFILL_P0'