Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: 171114  7:17:09 [ERROR] mysqld got signal 11 ;

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: This could be because you hit a bug. It is also possible that this binary

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: or one of the libraries it was linked against is corrupt, improperly built,

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: or misconfigured. This error can also be caused by malfunctioning hardware.

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: To report this bug, see https://mariadb.com/kb/en/reporting-bugs

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: We will try our best to scrape up some info that will hopefully help

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: diagnose the problem, but since we have already crashed,

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: something is definitely wrong and this may fail.

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: Server version: 10.2.9-MariaDB-10.2.9+maria~xenial-log

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: key_buffer_size=4194304

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: read_buffer_size=2097152

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: max_used_connections=12

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: max_threads=1002

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: thread_count=50

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: It is possible that mysqld could use up to

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 6181569 K  bytes of memory

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: Hope that's ok; if not, decrease some variables in the equation.

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: Thread pointer: 0x7fabc00009a8

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: Attempting backtrace. You can use the following information to find out

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: where mysqld died. If you see no messages after this, something went

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: terribly wrong...

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: stack_bottom = 0x7fc3040a5d18 thread_stack 0x49000

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: /usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x55fcfc8637ee]

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: /usr/sbin/mysqld(handle_fatal_signal+0x305)[0x55fcfc2fc535]

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: /lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fc308982390]

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: /usr/sbin/mysqld(_ZN13MYSQL_BIN_LOG13mark_xid_doneEmb+0x8b)[0x55fcfc3c90fb]

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: /usr/sbin/mysqld(binlog_background_thread+0x32b)[0x55fcfc3c976b]

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: /lib/x86_64-linux-gnu/libpthread.so.0(+0x76ba)[0x7fc3089786ba]

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7fc3080233dd]

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: Trying to get some variables.

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: Some pointers may be invalid and cause the dump to abort.

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: Query (0x0):

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: Connection ID (thread ID): 8

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: Status: NOT_KILLED

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: 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 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains

Nov 14 07:17:09 sysnet-uk-1604-db-01 mysqld[4838]: information that should help you find out what is causing the crash.

Nov 14 07:17:10 sysnet-uk-1604-db-01 systemd[1]: mariadb.service: Main process exited, code=killed, status=11/SEGV

Nov 14 07:17:10 sysnet-uk-1604-db-01 systemd[1]: mariadb.service: Unit entered failed state.

Nov 14 07:17:10 sysnet-uk-1604-db-01 systemd[1]: mariadb.service: Failed with result 'signal'.

Nov 14 07:17:15 sysnet-uk-1604-db-01 systemd[1]: mariadb.service: Service hold-off time over, scheduling restart.

Nov 14 07:17:15 sysnet-uk-1604-db-01 systemd[1]: Stopped MariaDB database server.

Nov 14 07:17:15 sysnet-uk-1604-db-01 systemd[1]: Starting MariaDB database server...