210510 3:21:37 [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: 10.5.9-MariaDB key_buffer_size=134217728 read_buffer_size=131072 max_used_connections=1 max_threads=153 thread_count=1 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 467864 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. Thread pointer: 0x62b00009a218 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 = 0x7faa10f11600 thread_stack 0x5fc00 /usr/local/mysql/bin/mariadbd(__interceptor_backtrace+0x5b)[0x917bfb] :0(mi_state_info_read)[0x6ad5ad8] sql/sql_yacc.cc:46457(MYSQLparse(THD*))[0x2beef02] sigaction.c:0(__restore_rt)[0x7faa305083c0] sql/sql_plugin.cc:0(plugin_thdvar_init(THD*))[0x180bab4] ??:0(LEX::create_unit(st_select_lex*))[0x15d1522] sql/sql_lex.cc:4198(st_select_lex_unit::union_needs_tmp_table())[0x15aa3d1] sql_lex.cc:0(my_ismbchar(charset_info_st const*, char const*, char const*))[0x15787e8] sql/sql_acl.cc:10007(handle_grant_table(THD*, Grant_table_base const&, enum_acl_tables, bool, LEX_USER*, LEX_USER*))[0x11b3969] sql/rpl_utility.cc:203(table_def)[0x233e81e] sql/sql_lex.cc:2808(Lex_input_stream::scan_ident_middle(THD*, Lex_ident_cli_st*, charset_info_st const**, my_lex_states*))[0x158e570] sql/sql_lex.cc:4336(LEX::set_trg_event_type_for_tables())[0x15aad13] sql_lex.cc:0(my_ismbchar(charset_info_st const*, char const*, char const*))[0x15787e8] ??:0(select_create::abort_result_set())[0x15364f5] sql/sql_insert.cc:5068(select_create::abort_result_set())[0x1534614] sql/sql_class.cc:2550(THD::make_string_literal_charset(Lex_string_with_metadata_st const&, charset_info_st const*))[0x1386f2f] sql/sql_cache.cc:4324(Query_cache::move_by_type(unsigned char**, Query_cache_block**, unsigned long*, Query_cache_block*))[0x133cf2d] ??:0(Query_cache::store_query(THD*, TABLE_LIST*))[0x1308593] ??:0(Query_cache::lock_and_suspend())[0x12f7243] ??:0(Query_cache::is_cacheable(THD*, LEX*, TABLE_LIST*, unsigned char*))[0x130cd19] ??:0(st_select_lex_unit::cleanup())[0x2023c1d] ??:0(st_select_lex_unit::cleanup())[0x202215d] maria/ma_write.c:402(maria_write)[0x46e90f3] nptl/pthread_create.c:478(start_thread)[0x7faa304fc609] ??:0(clone)[0x7faa2f86e293] Trying to get some variables. Some pointers may be invalid and cause the dump to abort. Query (0x62b0000a1238): select subq_0.c0 as c0 from (select ref_0.c_v7 as c0 from ((t_ykc as ref_0 ) cross join (t_ykc as ref_2 inner join t_ykc as ref_3 on (ref_2.c_qw2 > ( select ref_3.c_l2i8lidec as c0 from t_ykc as ref_4 order by -c0 desc)))) ) as subq_0 group by subq_0.c0 Connection ID (thread ID): 3 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=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,not_null_range_scan=off The manual page at https://mariadb.com/kb/en/how-to-produce-a-full-stack-trace-for-mysqld/ contains information that should help you find out what is causing the crash. Writing a core file... Working directory at /usr/local/mysql/data 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 79624 79624 processes Max open files 1048576 1048576 files Max locked memory 67108864 67108864 bytes Max address space unlimited unlimited bytes Max file locks unlimited unlimited locks Max pending signals 79624 79624 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