MariaDB 10.2.12 crashes after midnight

Our database sometimes crashes after midnight. We can't figure out why

• The CPU load / memory usage seems minimal
• Happened on the 6th and the 8th of this month, not since

This is a trace from the 6th of January

2018-01-06 0:16:00 140365306332928 [Note] Event Scheduler: [root@%].[obfuscated.sphinx_indexujProdukty] event execution failed.
180106 0:16:08 [ERROR] mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.

To report this bug, see https://mariadb.com/kb/en/reporting-bugs

We will try our best to scrape up some info that will hopefully help
diagnose the problem, but since we have already crashed,
something is definitely wrong and this may fail.

Server version: 10.2.11-MariaDB-log
key_buffer_size=33554432
read_buffer_size=1048576
max_used_connections=10
max_threads=152
thread_count=20
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 347227 K bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x7fa929839298
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0x7fa95828ddcf thread_stack 0x80000
/usr/sbin/mysqld(my_print_stacktrace+0x29)[0x55895fb4313d]
/usr/sbin/mysqld(handle_fatal_signal+0x329)[0x55895f62cacb]
/lib64/libpthread.so.0(+0x12fd0)[0x7faa09d38fd0]
/usr/sbin/mysqld(_ZN13Explain_queryD1Ev+0x78)[0x55895f5a8f80]
/usr/sbin/mysqld(_Z20delete_explain_queryP3LEX+0x15)[0x55895f5adb9f]
/usr/sbin/mysqld(_ZN12sp_instr_set9exec_coreEP3THDPj+0x45)[0x55895f71d671]
/usr/sbin/mysqld(_ZN13sp_lex_keeper23reset_lex_and_exec_coreEP3THDPjbP8sp_instr+0x368)[0x55895f7233d4]
/usr/sbin/mysqld(_ZN7sp_head7executeEP3THDb+0x78b)[0x55895f720175]
/usr/sbin/mysqld(_ZN7sp_head17execute_procedureEP3THDP4ListI4ItemE+0x3be)[0x55895f72131a]
/usr/sbin/mysqld(+0x4b744f)[0x55895f4cc44f]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x1507)[0x55895f4d43f8]
/usr/sbin/mysqld(_ZN13sp_instr_stmt9exec_coreEP3THDPj+0x14)[0x55895f71d864]
/usr/sbin/mysqld(_ZN13sp_lex_keeper23reset_lex_and_exec_coreEP3THDPjbP8sp_instr+0x93)[0x55895f7230ff]
/usr/sbin/mysqld(_ZN13sp_instr_stmt7executeEP3THDPj+0x1fd)[0x55895f7236b1]
/usr/sbin/mysqld(_ZN7sp_head7executeEP3THDb+0x78b)[0x55895f720175]
/usr/sbin/mysqld(_ZN7sp_head17execute_procedureEP3THDP4ListI4ItemE+0x735)[0x55895f721691]
/usr/sbin/mysqld(+0x4b744f)[0x55895f4cc44f]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x1507)[0x55895f4d43f8]
/usr/sbin/mysqld(_ZN13sp_instr_stmt9exec_coreEP3THDPj+0x14)[0x55895f71d864]
/usr/sbin/mysqld(_ZN13sp_lex_keeper23reset_lex_and_exec_coreEP3THDPjbP8sp_instr+0x93)[0x55895f7230ff]
/usr/sbin/mysqld(_ZN13sp_instr_stmt7executeEP3THDPj+0x1fd)[0x55895f7236b1]
/usr/sbin/mysqld(_ZN7sp_head7executeEP3THDb+0x78b)[0x55895f720175]
/usr/sbin/mysqld(_ZN7sp_head17execute_procedureEP3THDP4ListI4ItemE+0x3be)[0x55895f72131a]
/usr/sbin/mysqld(_ZN14Event_job_data7executeEP3THDb+0x867)[0x55895f57cd75]
/usr/sbin/mysqld(_ZN19Event_worker_thread3runEP3THDP28Event_queue_element_for_exec+0xda)[0x55895f750f3e]
/usr/sbin/mysqld(event_worker_thread+0x49)[0x55895f750fe9]
/lib64/libpthread.so.0(+0x74fb)[0x7faa09d2d4fb]
/lib64/libc.so.6(clone+0x3f)[0x7faa088b3e0f]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0x7fa8b8b78440): is an invalid pointer
Connection ID (thread ID): 631762
Status: NOT_KILLED

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

The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.

We think the query pointer is invalid, but we will try to print it anyway.
Query: CALL zakaznik_aktualizujClenyNarozeninovychSkupin()

This one is from the 8th

2018-01-08 0:09:25 140627835029248 [Note] Event Scheduler: [root@%].[obfuscated.sphinx_indexujProdukty] event execution failed.
180108 0:11:26 [ERROR] mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.

To report this bug, see https://mariadb.com/kb/en/reporting-bugs

We will try our best to scrape up some info that will hopefully help
diagnose the problem, but since we have already crashed,
something is definitely wrong and this may fail.

Server version: 10.2.12-MariaDB-log
key_buffer_size=33554432
read_buffer_size=1048576
max_used_connections=4
max_threads=152
thread_count=16
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 347227 K bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x7fe6342f1058
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0x7fe6880e8dcf thread_stack 0x80000
/usr/sbin/mysqld(my_print_stacktrace+0x29)[0x562da695b79a]
/usr/sbin/mysqld(handle_fatal_signal+0x359)[0x562da644ad39]
/lib64/libpthread.so.0(+0x12fd0)[0x7fe7191f3fd0]
/usr/sbin/mysqld(_ZN13Explain_query10get_selectEj+0xb)[0x562da63c7245]
/usr/sbin/mysqld(_ZN13Explain_query8add_nodeEP12Explain_node+0x95)[0x562da63c730f]
/usr/sbin/mysqld(_ZN4JOIN24save_explain_data_internEP13Explain_querybbbPKc+0xa80)[0x562da63385a8]
/usr/sbin/mysqld(_ZN4JOIN8optimizeEv+0xad)[0x562da633c9a5]
/usr/sbin/mysqld(_ZN13st_select_lex31optimize_unflattened_subqueriesEb+0x141)[0x562da62e9cad]
/usr/sbin/mysqld(_Z12mysql_insertP3THDP10TABLE_LISTR4ListI4ItemERS3_IS5_ES6_S6_15enum_duplicatesb+0x6e7)[0x562da62e0c1b]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x2833)[0x562da62f42dc]
/usr/sbin/mysqld(_ZN18Prepared_statement7executeEP6Stringb+0x4cf)[0x562da630923b]
/usr/sbin/mysqld(ZN18Prepared_statement12execute_loopEP6StringbPhS2+0xac)[0x562da630934a]
/usr/sbin/mysqld(_Z22mysql_sql_stmt_executeP3THD+0x124)[0x562da6309658]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x16e4)[0x562da62f318d]
/usr/sbin/mysqld(_ZN13sp_instr_stmt9exec_coreEP3THDPj+0x14)[0x562da653b71e]
/usr/sbin/mysqld(_ZN13sp_lex_keeper23reset_lex_and_exec_coreEP3THDPjbP8sp_instr+0x93)[0x562da6540fef]
/usr/sbin/mysqld(_ZN13sp_instr_stmt7executeEP3THDPj+0x1e8)[0x562da654158c]
/usr/sbin/mysqld(_ZN7sp_head7executeEP3THDb+0x7bb)[0x562da653e05b]
/usr/sbin/mysqld(_ZN7sp_head17execute_procedureEP3THDP4ListI4ItemE+0x51f)[0x562da653f367]
/usr/sbin/mysqld(+0x4ba09d)[0x562da62eb09d]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x1506)[0x562da62f2faf]
/usr/sbin/mysqld(_ZN13sp_instr_stmt9exec_coreEP3THDPj+0x14)[0x562da653b71e]
/usr/sbin/mysqld(_ZN13sp_lex_keeper23reset_lex_and_exec_coreEP3THDPjbP8sp_instr+0x93)[0x562da6540fef]
/usr/sbin/mysqld(_ZN13sp_instr_stmt7executeEP3THDPj+0x1e8)[0x562da654158c]
/usr/sbin/mysqld(_ZN7sp_head7executeEP3THDb+0x7bb)[0x562da653e05b]
/usr/sbin/mysqld(_ZN7sp_head17execute_procedureEP3THDP4ListI4ItemE+0x51f)[0x562da653f367]
/usr/sbin/mysqld(+0x4ba09d)[0x562da62eb09d]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x1506)[0x562da62f2faf]
/usr/sbin/mysqld(_ZN13sp_instr_stmt9exec_coreEP3THDPj+0x14)[0x562da653b71e]
/usr/sbin/mysqld(_ZN13sp_lex_keeper23reset_lex_and_exec_coreEP3THDPjbP8sp_instr+0x93)[0x562da6540fef]
/usr/sbin/mysqld(_ZN13sp_instr_stmt7executeEP3THDPj+0x1e8)[0x562da654158c]
/usr/sbin/mysqld(_ZN7sp_head7executeEP3THDb+0x7bb)[0x562da653e05b]
/usr/sbin/mysqld(_ZN7sp_head17execute_procedureEP3THDP4ListI4ItemE+0x51f)[0x562da653f367]
/usr/sbin/mysqld(+0x4ba09d)[0x562da62eb09d]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x1506)[0x562da62f2faf]
/usr/sbin/mysqld(_ZN13sp_instr_stmt9exec_coreEP3THDPj+0x14)[0x562da653b71e]
/usr/sbin/mysqld(_ZN13sp_lex_keeper23reset_lex_and_exec_coreEP3THDPjbP8sp_instr+0x93)[0x562da6540fef]
/usr/sbin/mysqld(_ZN13sp_instr_stmt7executeEP3THDPj+0x1e8)[0x562da654158c]
/usr/sbin/mysqld(_ZN7sp_head7executeEP3THDb+0x7bb)[0x562da653e05b]
/usr/sbin/mysqld(_ZN7sp_head17execute_procedureEP3THDP4ListI4ItemE+0x73c)[0x562da653f584]
/usr/sbin/mysqld(+0x4ba09d)[0x562da62eb09d]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x1506)[0x562da62f2faf]
/usr/sbin/mysqld(_ZN13sp_instr_stmt9exec_coreEP3THDPj+0x14)[0x562da653b71e]
/usr/sbin/mysqld(_ZN13sp_lex_keeper23reset_lex_and_exec_coreEP3THDPjbP8sp_instr+0x93)[0x562da6540fef]
/usr/sbin/mysqld(_ZN13sp_instr_stmt7executeEP3THDPj+0x1e8)[0x562da654158c]
/usr/sbin/mysqld(_ZN7sp_head7executeEP3THDb+0x7bb)[0x562da653e05b]
/usr/sbin/mysqld(_ZN7sp_head17execute_procedureEP3THDP4ListI4ItemE+0x51f)[0x562da653f367]
/usr/sbin/mysqld(_ZN14Event_job_data7executeEP3THDb+0x86f)[0x562da639af8d]
/usr/sbin/mysqld(_ZN19Event_worker_thread3runEP3THDP28Event_queue_element_for_exec+0xdf)[0x562da656e3c3]
/usr/sbin/mysqld(event_worker_thread+0x49)[0x562da656e46e]
/lib64/libpthread.so.0(+0x74fb)[0x7fe7191e84fb]
/lib64/libc.so.6(clone+0x3f)[0x7fe717d6ee0f]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0x7fe59c3e36e8): is an invalid pointer
Connection ID (thread ID): 60936
Status: NOT_KILLED

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

The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.

We think the query pointer is invalid, but we will try to print it anyway.
Query: INSERT INTO produkt__hodnota_atributu
SET
id_produkt = '8883',
id_atribut = '3',
id_vazba_atributu_na_skupinu = (SELECT id FROM produkt_atribut_vazba_na_skupiny WHERE id_atribut = '3' AND id_skupina_atributu = 1),
typ_hodnoty = 'varchar',
hodnota_varchar = '188.000000',
datum_vlozeni = NOW()

This is causing us some unfortunate issues. I wonder if modifing the "optimizer switches" couldn't help us - at lease temporarily....