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DB crashed today again, this is the error log:
Nov 26 12:50:25 websrv4 mysqld[22619]: 2017-11-26 12:50:25 140012249949952 [Warning] Aborted connection 3873 to db: 'proddb' user: 'CLIENT2' host: 'web3' (Got an error reading communication packets)
Nov 26 12:50:25 websrv4 mysqld[22619]: 2017-11-26 12:50:25 140012646905600 [Warning] Aborted connection 3874 to db: 'proddb' user: 'CLIENT2' host: 'web2' (Got an error reading communication packets)
Nov 26 12:50:26 websrv4 mysqld[22619]: 2017-11-26 12:50:26 140012646299392 [Warning] Aborted connection 3878 to db: 'proddb' user: 'CLIENT2' host: 'web2' (Got an error reading communication packets)
Nov 26 12:50:26 websrv4 mysqld[22619]: 171126 12:50:26 [ERROR] mysqld got signal 11 ;
Nov 26 12:50:26 websrv4 mysqld[22619]: This could be because you hit a bug. It is also possible that this binary
Nov 26 12:50:26 websrv4 mysqld[22619]: or one of the libraries it was linked against is corrupt, improperly built,
Nov 26 12:50:26 websrv4 mysqld[22619]: or misconfigured. This error can also be caused by malfunctioning hardware.
Nov 26 12:50:26 websrv4 mysqld[22619]: To report this bug, see https://mariadb.com/kb/en/reporting-bugs
Nov 26 12:50:26 websrv4 mysqld[22619]: We will try our best to scrape up some info that will hopefully help
Nov 26 12:50:26 websrv4 mysqld[22619]: diagnose the problem, but since we have already crashed,
Nov 26 12:50:26 websrv4 mysqld[22619]: something is definitely wrong and this may fail.
Nov 26 12:50:26 websrv4 mysqld[22619]: Server version: 10.2.10-MariaDB-10.2.10+maria~xenial-log
Nov 26 12:50:26 websrv4 mysqld[22619]: key_buffer_size=134217728
Nov 26 12:50:26 websrv4 mysqld[22619]: read_buffer_size=2097152
Nov 26 12:50:26 websrv4 mysqld[22619]: max_used_connections=10
Nov 26 12:50:26 websrv4 mysqld[22619]: max_threads=302
Nov 26 12:50:26 websrv4 mysqld[22619]: thread_count=19
Nov 26 12:50:26 websrv4 mysqld[22619]: It is possible that mysqld could use up to
Nov 26 12:50:26 websrv4 mysqld[22619]: key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1992937 K bytes of memory
Nov 26 12:50:26 websrv4 mysqld[22619]: Hope that's ok; if not, decrease some variables in the equation.
Nov 26 12:50:26 websrv4 mysqld[22619]: Thread pointer: 0x7f56bc0009a8
Nov 26 12:50:26 websrv4 mysqld[22619]: Attempting backtrace. You can use the following information to find out
Nov 26 12:50:26 websrv4 mysqld[22619]: where mysqld died. If you see no messages after this, something went
Nov 26 12:50:26 websrv4 mysqld[22619]: terribly wrong...
Nov 26 12:50:26 websrv4 mysqld[22619]: stack_bottom = 0x7f574c0ded18 thread_stack 0x49000
Nov 26 12:50:26 websrv4 mysqld[22619]: /usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x560b09dfd0ae]
Nov 26 12:50:26 websrv4 mysqld[22619]: /usr/sbin/mysqld(handle_fatal_signal+0x305)[0x560b09897085]
Nov 26 12:50:26 websrv4 mysqld[22619]: /lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f5752ce4390]
Nov 26 12:50:26 websrv4 mysqld[22619]: /usr/sbin/mysqld(_ZN13MYSQL_BIN_LOG13mark_xid_doneEmb+0x8b)[0x560b09963fdb]
Nov 26 12:50:26 websrv4 mysqld[22619]: /usr/sbin/mysqld(binlog_background_thread+0x32b)[0x560b0996464b]
Nov 26 12:50:26 websrv4 mysqld[22619]: /lib/x86_64-linux-gnu/libpthread.so.0(+0x76ba)[0x7f5752cda6ba]
Nov 26 12:50:26 websrv4 mysqld[22619]: /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f575238582d]
Nov 26 12:50:26 websrv4 mysqld[22619]: Trying to get some variables.
Nov 26 12:50:26 websrv4 mysqld[22619]: Some pointers may be invalid and cause the dump to abort.
Nov 26 12:50:26 websrv4 mysqld[22619]: Query (0x0):
Nov 26 12:50:26 websrv4 mysqld[22619]: Connection ID (thread ID): 8
Nov 26 12:50:26 websrv4 mysqld[22619]: Status: NOT_KILLED
Nov 26 12:50:26 websrv4 mysqld[22619]: Optimizer switch: index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on
Nov 26 12:50:26 websrv4 mysqld[22619]: The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
Nov 26 12:50:26 websrv4 mysqld[22619]: information that should help you find out what is causing the crash.
Nov 26 12:50:27 websrv4 systemd[1]: mariadb.service: Main process exited, code=dumped, status=11/SEGV
Nov 26 12:50:27 websrv4 systemd[1]: mariadb.service: Unit entered failed state.
Nov 26 12:50:27 websrv4 systemd[1]: mariadb.service: Failed with result 'core-dump'.
Nov 26 12:50:32 websrv4 systemd[1]: mariadb.service: Service hold-off time over, scheduling restart.
Nov 26 12:50:32 websrv4 systemd[1]: Stopped MariaDB database server.
Nov 26 12:50:32 websrv4 systemd[1]: Starting MariaDB database server...
Nov 26 12:50:37 websrv4 mysqld[7717]: WSREP: Recovered position d7d777bf-c235-11e7-ae1b-735d5455e9c8:1019175
Nov 26 12:50:37 websrv4 mysqld[7964]: 2017-11-26 12:50:37 139873024727232 [Note] /usr/sbin/mysqld (mysqld 10.2.10-MariaDB-10.2.10+maria~xenial-log) starting as process 7964 ...
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