160831 16:20:00 [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 http://kb.askmonty.org/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: 10.0.20-MariaDB-log key_buffer_size=25165824 read_buffer_size=12582912 max_used_connections=102 max_threads=502 thread_count=32 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 12371634 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. Thread pointer: 0x0x7fdc1d444008 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 = 0x7fdd4f106de0 thread_stack 0x48000 160831 16:20:01 [Warning] Aborted connection 147034 to db: 'glapp' user: 'glap_inf' host: '10.185.135.143' (Unknown error) 160831 16:20:01 [Warning] Aborted connection 147036 to db: 'glapp' user: 'glap_inf' host: '10.185.135.143' (Unknown error) 160831 16:20:01 [Warning] Aborted connection 147035 to db: 'glapp' user: 'glap_inf' host: '10.185.135.143' (Unknown error) 160831 16:20:01 [Warning] Aborted connection 147037 to db: 'glapp' user: 'glap_inf' host: '10.185.135.143' (Unknown error) 160831 16:20:01 [Warning] Aborted connection 147039 to db: 'glapp' user: 'glap_inf' host: '10.185.135.143' (Unknown error) 160831 16:20:02 [Warning] Aborted connection 147038 to db: 'glapp' user: 'glap_inf' host: '10.185.135.143' (Unknown error) 160831 16:20:02 [Warning] Aborted connection 147041 to db: 'glapp' user: 'glap_inf' host: '10.185.135.143' (Unknown error) 160831 16:20:02 [Warning] Aborted connection 147042 to db: 'glapp' user: 'glap_inf' host: '10.185.135.143' (Unknown error) 160831 16:20:03 [Warning] Aborted connection 147043 to db: 'glapp' user: 'glap_inf' host: '10.185.135.143' (Unknown error) 160831 16:20:03 [Warning] Aborted connection 147044 to db: 'glapp' user: 'glap_inf' host: '10.185.135.143' (Unknown error) mysys/stacktrace.c:247(my_print_stacktrace)[0xbcb2ee] sql/signal_handler.cc:153(handle_fatal_signal)[0x71fa8c] /lib64/libpthread.so.0[0x3bb0a0f7e0] sql/table.cc:6343(TABLE::actual_n_key_parts(st_key*))[0x6394c8] sql/opt_range.cc:3081(SQL_SELECT::test_quick_select(THD*, Bitmap<64u>, unsigned long long, unsigned long long, bool, bool))[0x83ab5b] sql/sql_select.cc:3345(get_quick_record_count)[0x5ea00c] sql/sql_select.cc:1337(JOIN::optimize_inner())[0x5eb06a] sql/sql_select.cc:1035(JOIN::optimize())[0x5edddb] sql/sql_derived.cc:807(mysql_derived_optimize(THD*, LEX*, TABLE_LIST*))[0x576d7d] sql/sql_derived.cc:195(mysql_handle_single_derived(LEX*, TABLE_LIST*, unsigned int))[0x57665a] sql/table.cc:6923(TABLE_LIST::handle_derived(LEX*, unsigned int))[0x63ba7a] sql/sql_lex.cc:3564(st_select_lex::handle_derived(LEX*, unsigned int))[0x5881b0] sql/table.cc:6918(TABLE_LIST::handle_derived(LEX*, unsigned int))[0x63ba5a] sql/sql_lex.cc:3564(st_select_lex::handle_derived(LEX*, unsigned int))[0x5881b0] sql/sql_select.cc:1080(JOIN::optimize_inner())[0x5ea9e8] sql/sql_select.cc:1035(JOIN::optimize())[0x5ee002] sql/sql_update.cc:1570(mysql_multi_update(THD*, TABLE_LIST*, List*, List*, Item*, unsigned long long, enum_duplicates, bool, st_select_lex_unit*, st_select_lex*, multi_update**))[0x631e9c] sql/sql_parse.cc:3379(mysql_execute_command(THD*))[0x59e254] sql/sql_parse.cc:6529(mysql_parse(THD*, char*, unsigned int, Parser_state*))[0x59fc86] sql/sql_parse.cc:1310(dispatch_command(enum_server_command, THD*, char*, unsigned int))[0x5a1bb7] sql/sql_parse.cc:999(do_command(THD*))[0x5a22f9] sql/sql_connect.cc:1378(do_handle_one_connection(THD*))[0x66c7d4] sql/sql_connect.cc:1295(handle_one_connection)[0x66c912] perfschema/pfs.cc:1863(pfs_spawn_thread)[0xa84cd9] /lib64/libpthread.so.0[0x3bb0a07aa1] /lib64/libc.so.6(clone+0x6d)[0x3bb02e8aad] Trying to get some variables. Some pointers may be invalid and cause the dump to abort. Query (0x7fdc1e834020): is an invalid pointer Connection ID (thread ID): 139412 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 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.