[Collections] - mindumps seen during Rebalance in + collection CRUD

guides/gradlew --refresh-dependencies testrunner -P jython=/opt/jython/bin/jython -P 'args=-i /tmp/win10-bucket-ops.ini rerun=False,get-cbcollect-info=True,quota_percent=95,crash_warning=True,rebalance_moves_per_node=64 -t bucket_collections.collections_rebalance.CollectionsRebalance.test_data_load_collections_with_rebalance_in,nodes_init=3,nodes_in=2,bucket_spec=multi_bucket.buckets_for_rebalance_tests_more_collections,data_load_spec=volume_test_load_with_CRUD_on_collections,data_load_stage=before,scrape_interval=5,rebalance_moves_per_node=32,quota_percent=80,skip_validations=False,GROUP=rebalance_with_collection_crud'

2021-03-02 00:22:49,375 | test  | INFO    | MainThread | [cluster_ready_functions:set_rebalance_moves_per_nodes:119] Changed Rebalance settings: {u'rebalanceMovesPerNode': 64}

2021-03-02 00:23:26,615 | test  | ERROR   | pool-1-thread-24 | [rest_client:_http_request:747] POST http://172.23.98.196:8091/controller/addNode body: hostname=http%3A%2F%2F172.23.104.186%3A8091&password=password&user=Administrator headers: {'Accept': '*/*', 'Connection': 'close', 'Authorization': 'Basic QWRtaW5pc3RyYXRvcjpwYXNzd29yZA==\n', 'Content-Type': 'application/x-www-form-urlencoded'} error: 400 reason: unknown ["Join completion call failed. Got HTTP status 500 from REST call post to http://172.23.104.186:8091/completeJoin. Body was: \"[\\\"Unexpected server error, request logged.\\\"]\""] auth: Administrator:password

2021-03-02 00:23:26,858 | test  | ERROR   | pool-1-thread-24 | [task:call:242] Error adding node: 172.23.104.186 to the cluster:172.23.98.196 - ["Join completion call failed. Got HTTP status 500 from REST call post to http://172.23.104.186:8091/completeJoin. Body was: \"[\\\"Unexpected server error, request logged.\\\"]\""]

[root@localhost logs]# grep CRITICAL memcached.log.0000*

memcached.log.000016.txt:2021-03-02T00:21:57.107143-08:00 CRITICAL *** Fatal error encountered during exception handling ***

memcached.log.000016.txt:2021-03-02T00:21:57.107243-08:00 CRITICAL Caught unhandled std::exception-derived exception. what(): std::bad_alloc

memcached.log.000016.txt:2021-03-02T00:21:57.737236-08:00 CRITICAL Breakpad caught a crash (Couchbase version 7.0.0-4574). Writing crash dump to /opt/couchbase/var/lib/couchbase/crash/ae8d6778-2a62-426c-7fdd22bd-95275336.dmp before terminating.

memcached.log.000016.txt:2021-03-02T00:21:57.737279-08:00 CRITICAL Stack backtrace of crashed thread:

memcached.log.000016.txt:2021-03-02T00:21:57.737590-08:00 CRITICAL     #0  /opt/couchbase/bin/memcached() [0x400000+0x14cc4d]

memcached.log.000016.txt:2021-03-02T00:21:57.737617-08:00 CRITICAL     #1  /opt/couchbase/bin/memcached(_ZN15google_breakpad16ExceptionHandler12GenerateDumpEPNS0_12CrashContextE+0x3ea) [0x400000+0x16304a]

memcached.log.000016.txt:2021-03-02T00:21:57.737640-08:00 CRITICAL     #2  /opt/couchbase/bin/memcached(_ZN15google_breakpad16ExceptionHandler13SignalHandlerEiP9siginfo_tPv+0xb8) [0x400000+0x163388]

memcached.log.000016.txt:2021-03-02T00:21:57.737735-08:00 CRITICAL     #3  /lib64/libpthread.so.0() [0x7f516953b000+0xf630]

memcached.log.000016.txt:2021-03-02T00:21:57.737786-08:00 CRITICAL     #4  /lib64/libc.so.6(gsignal+0x37) [0x7f516916d000+0x36387]

memcached.log.000016.txt:2021-03-02T00:21:57.737828-08:00 CRITICAL     #5  /lib64/libc.so.6(abort+0x148) [0x7f516916d000+0x37a78]

memcached.log.000016.txt:2021-03-02T00:21:57.737886-08:00 CRITICAL     #6  /opt/couchbase/bin/../lib/libstdc++.so.6(_ZN9__gnu_cxx27__verbose_terminate_handlerEv+0x125) [0x7f5169c70000+0x91195]

memcached.log.000016.txt:2021-03-02T00:21:57.737912-08:00 CRITICAL     #7  /opt/couchbase/bin/memcached() [0x400000+0x15c972]

memcached.log.000016.txt:2021-03-02T00:21:57.737960-08:00 CRITICAL     #8  /opt/couchbase/bin/../lib/libstdc++.so.6() [0x7f5169c70000+0x8ef86]

memcached.log.000016.txt:2021-03-02T00:21:57.738014-08:00 CRITICAL     #9  /opt/couchbase/bin/../lib/libstdc++.so.6() [0x7f5169c70000+0x8efd1]

memcached.log.000016.txt:2021-03-02T00:21:57.738081-08:00 CRITICAL     #10 /opt/couchbase/bin/../lib/libstdc++.so.6() [0x7f5169c70000+0xb9dfe]

memcached.log.000016.txt:2021-03-02T00:21:57.738106-08:00 CRITICAL     #11 /lib64/libpthread.so.0() [0x7f516953b000+0x7ea5]

memcached.log.000016.txt:2021-03-02T00:21:57.738161-08:00 CRITICAL     #12 /lib64/libc.so.6(clone+0x6d) [0x7f516916d000+0xfe8dd]