Crash observed with KV rebalance out and swap

 2021-02-06T19:45:43.409886-08:00 INFO 4: Client {"ip":"172.23.96.72","port":58078} authenticated as <ud>cbadminbucket</ud>

2021-02-06T19:46:08.306624-08:00 CRITICAL *** Fatal error encountered during exception handling ***

2021-02-06T19:46:08.306764-08:00 CRITICAL Caught unhandled std::exception-derived exception. what(): ThrowExceptionUnderflowPolicy current:0 arg:-328

2021-02-06T19:46:08.488921-08:00 CRITICAL Breakpad caught a crash (Couchbase version 7.0.0-4390). Writing crash dump to /opt/couchbase/var/lib/couchbase/crash/075fe5e5-c5a7-4b64-7a2352a5-96bf83a1.dmp before terminating.

2021-02-06T19:46:08.488949-08:00 CRITICAL Stack backtrace of crashed thread:

2021-02-06T19:46:08.489142-08:00 CRITICAL     /opt/couchbase/bin/memcached() [0x400000+0x14618d]

2021-02-06T19:46:08.489160-08:00 CRITICAL     /opt/couchbase/bin/memcached(_ZN15google_breakpad16ExceptionHandler12GenerateDumpEPNS0_12CrashContextE+0x3ea) [0x400000+0x15b9ba]

2021-02-06T19:46:08.489169-08:00 CRITICAL     /opt/couchbase/bin/memcached(_ZN15google_breakpad16ExceptionHandler13SignalHandlerEiP9siginfo_tPv+0xb8) [0x400000+0x15bcf8]

2021-02-06T19:46:08.489178-08:00 CRITICAL     /lib64/libpthread.so.0() [0x7f66d19c0000+0xf5f0]

2021-02-06T19:46:08.489200-08:00 CRITICAL     /lib64/libc.so.6(gsignal+0x37) [0x7f66d15f2000+0x36337]

2021-02-06T19:46:08.489221-08:00 CRITICAL     /lib64/libc.so.6(abort+0x148) [0x7f66d15f2000+0x37a28]

2021-02-06T19:46:08.489246-08:00 CRITICAL     /opt/couchbase/bin/../lib/libstdc++.so.6(_ZN9__gnu_cxx27__verbose_terminate_handlerEv+0x125) [0x7f66d20f5000+0x91195]

2021-02-06T19:46:08.489263-08:00 CRITICAL     /opt/couchbase/bin/memcached() [0x400000+0x155bf2]

2021-02-06T19:46:08.489278-08:00 CRITICAL     /opt/couchbase/bin/../lib/libstdc++.so.6() [0x7f66d20f5000+0x8ef86]

2021-02-06T19:46:08.489420-08:00 CRITICAL     /opt/couchbase/bin/../lib/libstdc++.so.6() [0x7f66d20f5000+0x8efd1]

2021-02-06T19:46:08.489432-08:00 CRITICAL     /opt/couchbase/bin/../lib/libep.so() [0x7f66d5a26000+0x16ee03]

2021-02-06T19:46:08.489440-08:00 CRITICAL     /opt/couchbase/bin/../lib/libep.so() [0x7f66d5a26000+0x168e62]

2021-02-06T19:46:08.489451-08:00 CRITICAL     /opt/couchbase/bin/../lib/libep.so() [0x7f66d5a26000+0x2e97f6]

2021-02-06T19:46:08.489471-08:00 CRITICAL     /opt/couchbase/bin/../lib/libep.so() [0x7f66d5a26000+0x2d1cea]

2021-02-06T19:46:08.489502-08:00 CRITICAL     /opt/couchbase/bin/../lib/libep.so() [0x7f66d5a26000+0x2ec919]

2021-02-06T19:46:08.489521-08:00 CRITICAL     /opt/couchbase/bin/../lib/libep.so() [0x7f66d5a26000+0x1672a3]

2021-02-06T19:46:08.489552-08:00 CRITICAL     /opt/couchbase/bin/../lib/libstdc++.so.6() [0x7f66d20f5000+0xb9dcf]

2021-02-06T19:46:08.489559-08:00 CRITICAL     /lib64/libpthread.so.0() [0x7f66d19c0000+0x7e65]

2021-02-06T19:46:08.489595-08:00 CRITICAL     /lib64/libc.so.6(clone+0x6d) [0x7f66d15f2000+0xfe88d]

2021-02-06T19:46:08.490964-08:00 INFO ---------- Closing logfile

2021-02-06T19:46:08.580104-08:00 INFO ---------- Opening logfile: /opt/couchbase/var/lib/couchbase/logs/memcached.log.000005.txt

2021-02-06T19:46:08.581954-08:00 INFO Couchbase version 7.0.0-4390 starting.

./testrunner -i /tmp/testexec.2791.ini -p get-cbcollect-info=True,GROUP=bucket_op,skip_log_scan=False,bucket_storage=couchstore -t eventing.eventing_rebalance.EventingRebalance.test_kv_rebalance_out_when_existing_eventing_node_is_processing_mutations,nodes_init=7,services_init=kv-kv-kv-eventing-eventing-eventing-index:n1ql,dataset=default,groups=simple,reset_services=True,doc-per-day=20,GROUP=bucket_op;bucket_op_windows

./testrunner -i /tmp/testexec.2791.ini -p get-cbcollect-info=True,GROUP=bucket_op,skip_log_scan=False,bucket_storage=couchstore -t eventing.eventing_rebalance.EventingRebalance.test_kv_swap_rebalance_when_existing_eventing_node_is_processing_mutations,nodes_init=6,services_init=kv-kv-eventing-eventing-eventing-index:n1ql,dataset=default,groups=simple,reset_services=True,doc-per-day=20,GROUP=bucket_op;bucket_op_windows