Crash observed in Collections::Manager::doCollectionStats at kv_engine/engines/ep/src/collections/manager.cc:803

Core was generated by `/opt/couchbase/bin/memcached -C /opt/couchbase/var/lib/couchbase/config/memcach'.

#0  operator* (this=<synthetic pointer>) at /tmp/workspace/couchbase-server-unix/kv_engine/engines/ep/src/collections/vbucket_manifest.cc:1125

1125	/tmp/workspace/couchbase-server-unix/kv_engine/engines/ep/src/collections/vbucket_manifest.cc: No such file or directory.

warning: File "/opt/couchbase/lib/libstdc++.so.6.0.28-gdb.py" auto-loading has been declined by your `auto-load safe-path' set to "$debugdir:$datadir/auto-load:/usr/bin/mono-gdb.py:/usr/lib/golang/src/pkg/runtime/runtime-gdb.py".

#0  operator* (this=<synthetic pointer>) at /tmp/workspace/couchbase-server-unix/kv_engine/engines/ep/src/collections/vbucket_manifest.cc:1125

#1  operator-> (this=<synthetic pointer>) at /tmp/workspace/couchbase-server-unix/server_build/tlm/deps/folly.exploded/include/folly/container/detail/F14Policy.h:719

#2  Collections::VB::Manifest::accumulateStats (this=0x7faa664f6e40, collections=..., summary=...) at /tmp/workspace/couchbase-server-unix/kv_engine/engines/ep/src/collections/vbucket_manifest.cc:1125

#3  0x000000000074be3c in accumulateStats (summary=..., collections=..., this=0x7faac67e9930) at /tmp/workspace/couchbase-server-unix/kv_engine/engines/ep/src/collections/vbucket_manifest_handles.h:182

#4  CollectionsGetStatsVBucketVisitor::visitBucket (this=0x7faac67e9a80, vb=...) at /tmp/workspace/couchbase-server-unix/kv_engine/engines/ep/src/collections/manager.cc:390

#5  0x00000000006aa03b in KVBucket::visit(VBucketVisitor&) () at /tmp/workspace/couchbase-server-unix/kv_engine/engines/ep/src/kv_bucket.cc:2253

#6  0x00000000007448f0 in Collections::Manager::getPerCollectionStats(std::vector<Collections::CollectionEntry, std::allocator<Collections::CollectionEntry> > const&, KVBucket&) () at /tmp/workspace/couchbase-server-unix/kv_engine/engines/ep/src/collections/manager.cc:803

#7  0x0000000000748dbb in Collections::Manager::doOneCollectionStats(KVBucket&, BucketStatCollector const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) () at /opt/gcc-10.2.0/include/c++/10.2.0/bits/stl_uninitialized.h:90

#8  0x0000000000749352 in Collections::Manager::doCollectionStats(KVBucket&, BucketStatCollector const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) () at /tmp/workspace/couchbase-server-unix/kv_engine/engines/ep/src/collections/manager.cc:463

#9  0x000000000066d712 in EventuallyPersistentEngine::doCollectionStats(void const*, std::function<void (std::basic_string_view<char, std::char_traits<char> >, std::basic_string_view<char, std::char_traits<char> >, gsl::not_null<void const*>)> const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) () at /tmp/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_engine.cc:4351

#10 0x000000000066f48b in EventuallyPersistentEngine::getStats(void const*, std::basic_string_view<char, std::char_traits<char> >, std::basic_string_view<char, std::char_traits<char> >, std::function<void (std::basic_string_view<char, std::char_traits<char> >, std::basic_string_view<char, std::char_traits<char> >, gsl::not_null<void const*>)> const&) () at /tmp/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_engine.cc:4762

#11 0x000000000066f6f0 in EventuallyPersistentEngine::get_stats(gsl::not_null<void const*>, std::basic_string_view<char, std::char_traits<char> >, std::basic_string_view<char, std::char_traits<char> >, std::function<void (std::basic_string_view<char, std::char_traits<char> >, std::basic_string_view<char, std::char_traits<char> >, gsl::not_null<void const*>)> const&) () at /tmp/workspace/couchbase-server-unix/third_party/gsl-lite/include/gsl/gsl-lite.hpp:673

#12 0x0000000000565017 in bucket_get_stats(Cookie&, std::basic_string_view<char, std::char_traits<char> >, cb::sized_buffer<unsigned char const>, std::function<void (std::basic_string_view<char, std::char_traits<char> >, std::basic_string_view<char, std::char_traits<char> >, gsl::not_null<void const*>)> const&) () at /tmp/workspace/couchbase-server-unix/third_party/gsl-lite/include/gsl/gsl-lite.hpp:673

#13 0x00000000006029d3 in StatsCommandContext::doStats() () at /tmp/workspace/couchbase-server-unix/kv_engine/daemon/protocol/mcbp/stats_context.cc:721

#14 0x0000000000602cd8 in StatsCommandContext::step (this=0x7faaceb61750) at /tmp/workspace/couchbase-server-unix/kv_engine/daemon/protocol/mcbp/stats_context.cc:643

#15 0x0000000000606c90 in SteppableCommandContext::drive() () at /tmp/workspace/couchbase-server-unix/kv_engine/daemon/protocol/mcbp/steppable_command_context.cc:36

#16 0x00000000005c4bd8 in Cookie::execute(bool) () at /tmp/workspace/couchbase-server-unix/kv_engine/include/mcbp/protocol/header.h:110

#17 0x00000000005aa018 in Connection::executeCommandPipeline() () at /tmp/workspace/couchbase-server-unix/kv_engine/daemon/cookie.h:466

#18 0x00000000005ab847 in Connection::executeCommandsCallback() () at /tmp/workspace/couchbase-server-unix/kv_engine/daemon/connection.cc:688

#19 0x00000000005ac461 in Connection::rw_callback(bufferevent*, void*) () at /tmp/workspace/couchbase-server-unix/kv_engine/daemon/connection.cc:885

#20 0x00007faad1e90d8e in bufferevent_run_deferred_callbacks_unlocked (cb=<optimized out>, arg=0x7faaceb70e80) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/bufferevent.c:208

#21 0x00007faad1e99d01 in event_process_active_single_queue (base=base@entry=0x7faaceca5300, max_to_process=max_to_process@entry=2147483647, endtime=endtime@entry=0x0, activeq=<optimized out>) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/event.c:1726

#22 0x00007faad1e9a54f in event_process_active (base=0x7faaceca5300) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/event.c:1789

#23 event_base_loop (base=0x7faaceca5300, flags=flags@entry=0) at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/libevent/libevent-prefix/src/libevent/event.c:2012

#24 0x000000000058609b in worker_libevent (arg=0x7faacecf9000) at /tmp/workspace/couchbase-server-unix/kv_engine/daemon/thread.cc:202

#25 0x00007faad2be7bd9 in run (this=0x7faacec56c20) at /tmp/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:58

#26 platform_thread_wrap(void*) () at /tmp/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:71

#27 0x00007faad05bbe65 in start_thread () from /lib64/libpthread.so.0

#28 0x00007faad02e488d in hcreate_r () from /lib64/libc.so.6

#29 0x0000000000000000 in ?? ()

guides/gradlew --refresh-dependencies testrunner -P jython=/opt/jython/bin/jython -P 'args=-i /tmp/testexec.13993.ini GROUP=P2,threads_to_use=10,upgrade_version=7.0.0-5017 -t cbas.cbas_collection_functional_test.CBASDatasetsAndCollections.test_KV_collection_deletion_does_not_effect_dataset_on_other_collections,bucket_spec=analytics.single_bucket,index_name=idx_age,index_fields=age:bigint,cardinality=1,bucket_cardinality=3,analytics_index=False,nodes_init=4,services_init=kv:n1ql-kv-cbas-cbas,GROUP=P2'