191212 13:31:05 [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: 10.4.10-MariaDB-1:10.4.10+maria~stretch-log key_buffer_size=4096 read_buffer_size=2097152 max_used_connections=293 max_threads=65540 thread_count=247 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 2281853051 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. Thread pointer: 0x7f637c150388 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 = 0x7f66d1954c18 thread_stack 0x30000 /usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x558b3acfc15e] /usr/sbin/mysqld(handle_fatal_signal+0x3af)[0x558b3a7891bf] /lib/x86_64-linux-gnu/libpthread.so.0(+0x110e0)[0x7f98014cc0e0] /usr/sbin/mysqld(_ZN4JOIN7destroyEv+0x20)[0x558b3a5b52f0] /usr/sbin/mysqld(_ZN13st_select_lex7cleanupEv+0x6d)[0x558b3a61530d] /usr/sbin/mysqld(_ZN30subselect_single_select_engine7prepareEP3THD+0x3c)[0x558b3a838bdc] /usr/sbin/mysqld(_ZN14Item_subselect10fix_fieldsEP3THDPP4Item+0x143)[0x558b3a8385b3] /usr/sbin/mysqld(_ZN9Item_func10fix_fieldsEP3THDPP4Item+0x153)[0x558b3a7ed103] /usr/sbin/mysqld(_ZN13Item_func_not10fix_fieldsEP3THDPP4Item+0x1c6)[0x558b3a7c1076] /usr/sbin/mysqld(_ZN9Item_cond10fix_fieldsEP3THDPP4Item+0x11e)[0x558b3a7c187e] /usr/sbin/mysqld(_ZN3THD16sp_fix_func_itemEPP4Item+0x90)[0x558b3a4d9b90] /usr/sbin/mysqld(_ZN3THD20sp_prepare_func_itemEPP4Itemj+0xf)[0x558b3a4d9baf] /usr/sbin/mysqld(_ZN20sp_instr_jump_if_not9exec_coreEP3THDPj+0x1e)[0x558b3a4d9bfe] /usr/sbin/mysqld(_ZN13sp_lex_keeper23reset_lex_and_exec_coreEP3THDPjbP8sp_instr+0x152)[0x558b3a4dfc32] /usr/sbin/mysqld(_ZN7sp_head7executeEP3THDb+0xa2c)[0x558b3a4db77c] /usr/sbin/mysqld(_ZN7sp_head15execute_triggerEP3THDPK25st_mysql_const_lex_stringS4_P13st_grant_info+0x23c)[0x558b3a4dc45c] /usr/sbin/mysqld(_ZN19Table_triggers_list16process_triggersEP3THD14trg_event_type20trg_action_time_typeb+0x105)[0x558b3a60df35] /usr/sbin/mysqld(_Z12write_recordP3THDP5TABLEP12st_copy_info+0xcf)[0x558b3a53e47f] /usr/sbin/mysqld(_ZN13select_insert9send_dataER4ListI4ItemE+0xf9)[0x558b3a53f129] /usr/sbin/mysqld(_ZN4JOIN10exec_innerEv+0xa56)[0x558b3a5cf056] /usr/sbin/mysqld(_ZN4JOIN4execEv+0x33)[0x558b3a5cf433] /usr/sbin/mysqld(_Z12mysql_selectP3THDP10TABLE_LISTjR4ListI4ItemEPS4_jP8st_orderS9_S7_S9_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x186)[0x558b3a5cd806] /usr/sbin/mysqld(_Z13handle_selectP3THDP3LEXP13select_resultm+0xf6)[0x558b3a5ce156] /usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x7c5f)[0x558b3a57874f] /usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_statebb+0x23a)[0x558b3a57985a] /usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcjbb+0x1349)[0x558b3a57bdd9] /usr/sbin/mysqld(_Z10do_commandP3THD+0x11c)[0x558b3a57d66c] /usr/sbin/mysqld(_Z11tp_callbackP13TP_connection+0xe8)[0x558b3a75afd8] /usr/sbin/mysqld(+0x9f1ad0)[0x558b3a910ad0] /usr/sbin/mysqld(+0xd86551)[0x558b3aca5551] /lib/x86_64-linux-gnu/libpthread.so.0(+0x74a4)[0x7f98014c24a4] /lib/x86_64-linux-gnu/libc.so.6(clone+0x3f)[0x7f97ffc20d0f] Trying to get some variables. Some pointers may be invalid and cause the dump to abort. Query (0x7f637c15a650): INSERT IGNORE INTO user_lnk_contact (user_id, client_id, contact_id, is_created) SELECT 132561 , (SELECT client_id FROM sf_guard_user AS u WHERE u.id=132561) , 44028334 , 1 Connection ID (thread ID): 7458 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=on,mrr_cost_based=off,mrr_sort_keys=on,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=on,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on,split_materialized=on,condition_pushdown_for_subquery=on,rowid_filter=on,condition_pushdown_from_having=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. Writing a core file... Working directory at /data/var/lib/mysql Resource Limits: Limit Soft Limit Hard Limit Units Max cpu time unlimited unlimited seconds Max file size unlimited unlimited bytes Max data size unlimited unlimited bytes Max stack size 8388608 unlimited bytes Max core file size 0 unlimited bytes Max resident set unlimited unlimited bytes Max processes 1030877 1030877 processes Max open files 16364 16364 files Max locked memory 65536 65536 bytes Max address space unlimited unlimited bytes Max file locks unlimited unlimited locks Max pending signals 1030877 1030877 signals Max msgqueue size 819200 819200 bytes Max nice priority 0 0 Max realtime priority 0 0 Max realtime timeout unlimited unlimited us Core pattern: core