Aborted connection 271303 to db: 'glaptest' user: 'glap_test' host: '10.64.187.158' (Unknown error) 160708 14:54:58 [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: 10.1.13-MariaDB key_buffer_size=25165824 read_buffer_size=50331648 max_used_connections=115 max_threads=502 thread_count=70 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 49383446 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. Thread pointer: 0x0x7fe09fce3008 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 = 0x7fec3d4f91d8 thread_stack 0x48400 (my_addr_resolve failure: fork) /engn001/masvc01/mysql/bin/mysqld(my_print_stacktrace+0x2e) [0xc011ce] /engn001/masvc01/mysql/bin/mysqld(handle_fatal_signal+0x464) [0x7647a4] /lib64/libpthread.so.0() [0x34c1e0f7e0] /engn001/masvc01/mysql/bin/mysqld(Item_cache::is_expensive_processor(unsigned char*)+0x18) [0x792e58] /engn001/masvc01/mysql/bin/mysqld(Item_cache::walk(bool (Item::*)(unsigned char*), bool, unsigned char*)+0x90) [0x792f00] /engn001/masvc01/mysql/bin/mysqld(Item_func_or_sum::walk(bool (Item::*)(unsigned char*), bool, unsigned char*)+0x7f) [0x52b86f] /engn001/masvc01/mysql/bin/mysqld(Item_func_or_sum::walk(bool (Item::*)(unsigned char*), bool, unsigned char*)+0x7f) [0x52b86f] /engn001/masvc01/mysql/bin/mysqld(Item_ref::walk(bool (Item::*)(unsigned char*), bool, unsigned char*)+0x52) [0x56f552] /engn001/masvc01/mysql/bin/mysqld(Item_func_or_sum::walk(bool (Item::*)(unsigned char*), bool, unsigned char*)+0x7f) [0x52b86f] /engn001/masvc01/mysql/bin/mysqld(Item::is_expensive()+0x4a) [0x52b6aa] /engn001/masvc01/mysql/bin/mysqld(Item_bool_func2_with_rev::get_mm_tree(RANGE_OPT_PARAM*, Item**)+0x138) [0x56fe68] /engn001/masvc01/mysql/bin/mysqld(Item_cond_and::get_mm_tree(RANGE_OPT_PARAM*, Item**)+0x42) [0x8836e2] /engn001/masvc01/mysql/bin/mysqld(SQL_SELECT::test_quick_select(THD*, Bitmap<64u>, unsigned long long, unsigned long long, bool, bool, bool)+0x43a) [0x8885ba] /engn001/masvc01/mysql/bin/mysqld() [0x602241] /engn001/masvc01/mysql/bin/mysqld(JOIN::optimize_inner()+0x8dd) [0x6031cd] /engn001/masvc01/mysql/bin/mysqld(JOIN::optimize()+0x23) [0x606263] /engn001/masvc01/mysql/bin/mysqld(st_select_lex::optimize_unflattened_subqueries(bool)+0x216) [0x5a4bd6] /engn001/masvc01/mysql/bin/mysqld(JOIN::optimize_unflattened_subqueries()+0x12) [0x6d2732] /engn001/masvc01/mysql/bin/mysqld(JOIN::optimize_inner()+0x22ca) [0x604bba] /engn001/masvc01/mysql/bin/mysqld(mysql_select(THD*, Item***, TABLE_LIST*, unsigned int, List&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*)+0x9e) [0x6063be] /engn001/masvc01/mysql/bin/mysqld(handle_select(THD*, LEX*, select_result*, unsigned long)+0x250) [0x60a180] /engn001/masvc01/mysql/bin/mysqld() [0x5abe48] /engn001/masvc01/mysql/bin/mysqld(mysql_execute_command(THD*)+0x1545) [0x5b1fd5] /engn001/masvc01/mysql/bin/mysqld(Prepared_statement::execute(String*, bool)+0x4cc) [0x5c90bc] /engn001/masvc01/mysql/bin/mysqld(Prepared_statement::execute_loop(String*, bool, unsigned char*, unsigned char*)+0xaa) [0x5ce21a] /engn001/masvc01/mysql/bin/mysqld(mysqld_stmt_execute(THD*, char*, unsigned int)+0x164) [0x5ce714] /engn001/masvc01/mysql/bin/mysqld(dispatch_command(enum_server_command, THD*, char*, unsigned int)+0xb06) [0x5bbc16] /engn001/masvc01/mysql/bin/mysqld(do_command(THD*)+0x2a7) [0x5bd8c7] /engn001/masvc01/mysql/bin/mysqld(do_handle_one_connection(THD*)+0x183) [0x68c2a3] /engn001/masvc01/mysql/bin/mysqld(handle_one_connection+0x42) [0x68c4c2] /engn001/masvc01/mysql/bin/mysqld() [0xb034e9] /lib64/libpthread.so.0() [0x34c1e07aa1] /lib64/libc.so.6(clone+0x6d) [0x34c16e893d] Trying to get some variables. Some pointers may be invalid and cause the dump to abort. Query (0x7fe0ea835020): is an invalid pointer Connection ID (thread ID): 271665 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.