07:59:06 UTC - mysqld got signal 11 ; Most likely, you have hit a bug, but this error can also be caused by malfunctioning hardware. Thread pointer: 0x7fba01080a00 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 = 700004752f48 thread_stack 0x46000 0 mysqld 0x000000010fe90cb9 my_print_stacktrace(unsigned char const*, unsigned long) + 60 1 mysqld 0x000000010f4ddf13 handle_fatal_signal + 435 2 libsystem_platform.dylib 0x00007fff72a7542d _sigtramp + 29 3 ??? 0x00007fba02d89378 0x0 + 140436888392568 4 mysqld 0x000000010f1e4001 Item_result_field::mark_field_in_map(unsigned char*) + 49 5 mysqld 0x000000010f37d32e SELECT_LEX_UNIT::check_materialized_derived_query_blocks(THD*) + 222 6 mysqld 0x000000010f4059e1 SELECT_LEX::resolve_placeholder_tables(THD*, bool) + 295 7 mysqld 0x000000010f404dd3 SELECT_LEX::prepare(THD*) + 499 8 mysqld 0x000000010f410798 Sql_cmd_select::prepare_inner(THD*) + 868 9 mysqld 0x000000010f410304 Sql_cmd_dml::prepare(THD*) + 290 10 mysqld 0x000000010f4108e9 Sql_cmd_dml::execute(THD*) + 241 11 mysqld 0x000000010f3d67c3 mysql_execute_command(THD*, bool) + 3584 12 mysqld 0x000000010f3fed0d Prepared_statement::execute(String*, bool) + 1199 13 mysqld 0x000000010f3fd88f Prepared_statement::execute_loop(String*, bool) + 145 14 mysqld 0x000000010f3fd6df mysqld_stmt_execute(THD*, Prepared_statement*, bool, unsigned long, PS_PARAM*) + 245 15 mysqld 0x000000010f3d3232 dispatch_command(THD*, COM_DATA const*, enum_server_command) + 3906 16 mysqld 0x000000010f3d4385 do_command(THD*) + 248 17 mysqld 0x000000010f4cbaf7 handle_connection(void*) + 368 18 mysqld 0x00000001102032ac pfs_spawn_thread(void*) + 290 19 libsystem_pthread.dylib 0x00007fff72a80e65 _pthread_start + 148 20 libsystem_pthread.dylib 0x00007fff72a7c83b thread_start + 15 Trying to get some variables. Some pointers may be invalid and cause the dump to abort. Query (7fba06affa68): [REDACTED BUT THE QUERY CONTAINS A UNION] Connection ID (thread ID): 84 Status: NOT_KILLED