Jul  2 08:45:25 big-galera-02 mysqld[30909]: 2018-07-02 08:45:25 7fc62432ab00  InnoDB: Assertion failure in thread 140488987552512 in file row0mysql.cc line 4743
Jul  2 08:45:25 big-galera-02 mysqld[30909]: InnoDB: Failing assertion: memcmp(table_name, name, namelen) == 0
Jul  2 08:45:25 big-galera-02 mysqld[30909]: InnoDB: We intentionally generate a memory trap.
Jul  2 08:45:25 big-galera-02 mysqld[30909]: InnoDB: Submit a detailed bug report to https://jira.mariadb.org/
Jul  2 08:45:25 big-galera-02 mysqld[30909]: InnoDB: If you get repeated assertion failures or crashes, even
Jul  2 08:45:25 big-galera-02 mysqld[30909]: InnoDB: immediately after the mysqld startup, there may be
Jul  2 08:45:25 big-galera-02 mysqld[30909]: InnoDB: corruption in the InnoDB tablespace. Please refer to
Jul  2 08:45:25 big-galera-02 mysqld[30909]: InnoDB: http://dev.mysql.com/doc/refman/5.6/en/forcing-innodb-recovery.html
Jul  2 08:45:25 big-galera-02 mysqld[30909]: InnoDB: about forcing recovery.
Jul  2 08:45:25 big-galera-02 mysqld[30909]: 180702  8:45:25 [ERROR] mysqld got signal 6 ;
Jul  2 08:45:25 big-galera-02 mysqld[30909]: This could be because you hit a bug. It is also possible that this binary
Jul  2 08:45:25 big-galera-02 mysqld[30909]: or one of the libraries it was linked against is corrupt, improperly built,
Jul  2 08:45:25 big-galera-02 mysqld[30909]: or misconfigured. This error can also be caused by malfunctioning hardware.
Jul  2 08:45:25 big-galera-02 mysqld[30909]: To report this bug, see https://mariadb.com/kb/en/reporting-bugs
Jul  2 08:45:25 big-galera-02 mysqld[30909]: We will try our best to scrape up some info that will hopefully help
Jul  2 08:45:25 big-galera-02 mysqld[30909]: diagnose the problem, but since we have already crashed,
Jul  2 08:45:25 big-galera-02 mysqld[30909]: something is definitely wrong and this may fail.
Jul  2 08:45:25 big-galera-02 mysqld[30909]: Server version: 10.1.32-MariaDB-1~xenial
Jul  2 08:45:25 big-galera-02 mysqld[30909]: key_buffer_size=134217728
Jul  2 08:45:25 big-galera-02 mysqld[30909]: read_buffer_size=2097152
Jul  2 08:45:25 big-galera-02 mysqld[30909]: max_used_connections=83
Jul  2 08:45:25 big-galera-02 mysqld[30909]: max_threads=302
Jul  2 08:45:25 big-galera-02 mysqld[30909]: thread_count=43
Jul  2 08:45:25 big-galera-02 mysqld[30909]: It is possible that mysqld could use up to
Jul  2 08:45:25 big-galera-02 mysqld[30909]: key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 3229816 K  bytes of memory
Jul  2 08:45:25 big-galera-02 mysqld[30909]: Hope that's ok; if not, decrease some variables in the equation.
Jul  2 08:45:25 big-galera-02 mysqld[30909]: Thread pointer: 0x7fb4a1012008
Jul  2 08:45:25 big-galera-02 mysqld[30909]: Attempting backtrace. You can use the following information to find out
Jul  2 08:45:25 big-galera-02 mysqld[30909]: where mysqld died. If you see no messages after this, something went
Jul  2 08:45:25 big-galera-02 mysqld[30909]: terribly wrong...
Jul  2 08:45:25 big-galera-02 mysqld[30909]: stack_bottom = 0x7fc624329cd8 thread_stack 0x48400
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x55c00206001e]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/sbin/mysqld(handle_fatal_signal+0x2f5)[0x55c001ba71d5]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fc626fd6390]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x38)[0x7fc6265a5428]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /lib/x86_64-linux-gnu/libc.so.6(abort+0x16a)[0x7fc6265a702a]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/sbin/mysqld(+0x8dc403)[0x55c001ee1403]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/sbin/mysqld(+0x81c9e6)[0x55c001e219e6]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/sbin/mysqld(+0x5a256f)[0x55c001ba756f]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/sbin/mysqld(_Z24plugin_foreach_with_maskP3THDPFcS0_P13st_plugin_intPvEijS3_+0x1c8)[0x55c001a23728]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/sbin/mysqld(+0x3e62bb)[0x55c0019eb2bb]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x609d)[0x55c001a161ad]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x311)[0x55c001a194d1]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/sbin/mysqld(_ZN15Query_log_event14do_apply_eventEP14rpl_group_infoPKcj+0x1391)[0x55c001c727d1]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/sbin/mysqld(wsrep_apply_cb+0x642)[0x55c001b53812]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/lib/galera/libgalera_smm.so(_ZNK6galera9TrxHandle5applyEPvPF15wsrep_cb_statusS1_PKvmjPK14wsrep_trx_metaERS6_+0x106)[0x7fc61ed25ac6]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/lib/galera/libgalera_smm.so(+0x2283d6)[0x7fc61ed743d6]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/lib/galera/libgalera_smm.so(_ZN6galera13ReplicatorSMM9apply_trxEPvPNS_9TrxHandleE+0x15c)[0x7fc61ed771bc]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/lib/galera/libgalera_smm.so(_ZN6galera13ReplicatorSMM11process_trxEPvPNS_9TrxHandleE+0x13e)[0x7fc61ed79cbe]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/lib/galera/libgalera_smm.so(_ZN6galera15GcsActionSource8dispatchEPvRK10gcs_actionRb+0x1d8)[0x7fc61ed50af8]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/lib/galera/libgalera_smm.so(_ZN6galera15GcsActionSource7processEPvRb+0x76)[0x7fc61ed521b6]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/lib/galera/libgalera_smm.so(_ZN6galera13ReplicatorSMM10async_recvEPv+0x83)[0x7fc61ed7a3a3]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/lib/galera/libgalera_smm.so(galera_recv+0x2b)[0x7fc61ed9434b]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/sbin/mysqld(+0x54f977)[0x55c001b54977]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /usr/sbin/mysqld(start_wsrep_THD+0x465)[0x55c001b43ca5]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /lib/x86_64-linux-gnu/libpthread.so.0(+0x76ba)[0x7fc626fcc6ba]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7fc62667741d]
Jul  2 08:45:25 big-galera-02 mysqld[30909]: Trying to get some variables.
Jul  2 08:45:25 big-galera-02 mysqld[30909]: Some pointers may be invalid and cause the dump to abort.
Jul  2 08:45:25 big-galera-02 mysqld[30909]: Query (0x7fb4a133288c): DROP DATABASE `example-net`
Jul  2 08:45:25 big-galera-02 mysqld[30909]: Connection ID (thread ID): 9
Jul  2 08:45:25 big-galera-02 mysqld[30909]: Status: NOT_KILLED
Jul  2 08:45:25 big-galera-02 mysqld[30909]: 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=off
Jul  2 08:45:25 big-galera-02 mysqld[30909]: The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
Jul  2 08:45:25 big-galera-02 mysqld[30909]: information that should help you find out what is causing the crash.
Jul  2 08:45:25 big-galera-02 systemd[1]: mariadb.service: Main process exited, code=killed, status=6/ABRT
Jul  2 08:45:25 big-galera-02 systemd[1]: mariadb.service: Unit entered failed state.
Jul  2 08:45:25 big-galera-02 systemd[1]: mariadb.service: Failed with result 'signal'.
Jul  2 08:45:30 big-galera-02 systemd[1]: mariadb.service: Service hold-off time over, scheduling restart.