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. 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. key_buffer_size=8388572 read_buffer_size=131072 max_used_connections=1 max_connections=100 threads_connected=1 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_connections = 225788 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. thd=0x8c08f68 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... Cannot determine thread, fp=0xbe7fe138, backtrace may not be correct. Stack range sanity check OK, backtrace follows: 0x80de76b handle_segfault + 417 0x83d513d __pthread_sighandler + 173 0x842291c memcpy + 28 0x80d67ab _ZN8Protocol16store_string_auxEPKcjP15charset_info_stS3_ + 173 0x80d6de6 _ZN15Protocol_simple5storeEP5Field + 198 0x8059645 _ZN10Item_field4sendEP8ProtocolP6String + 27 0x80cdf91 _ZN11select_send9send_dataER4ListI4ItemE + 241 0x8144e8b _Z8end_sendP4JOINP13st_join_tableb + 211 0x81436d3 _Z20evaluate_join_recordP4JOINP13st_join_tableiPc + 471 0x814349b _Z10sub_selectP4JOINP13st_join_tableb + 209 0x8142fb9 _Z9do_selectP4JOINP4ListI4ItemEP8st_tableP9Procedure + 783 0x8132a01 _ZN4JOIN4execEv + 6923 0x8132ee3 _Z12mysql_selectP3THDPPP4ItemP13st_table_listjR4ListIS1_ES2_jP8st_orderSB_S2_SB_yP13select_resultP18st_select_lex_unitP13st_sel + 637 0x812e0a9 _Z13handle_selectP3THDP6st_lexP13select_resultm + 329 0x80f5cc1 _Z21mysql_execute_commandP3THD + 1729 0x80fdf98 _Z11mysql_parseP3THDPcj + 380 0x80f3ef8 _Z16dispatch_command19enum_server_commandP3THDPcj + 1940 0x80f3759 _Z10do_commandP3THD + 523 0x80f28fb handle_one_connection + 909 0x83d0011 pthread_start_thread + 225 0x842aafa __clone + 106 New value of fp=(nil) failed sanity check, terminating stack trace! Please read http://dev.mysql.com/doc/mysql/en/using-stack-trace.html and follow instructions on how to resolve the stack trace. Resolved stack trace is much more helpful in diagnosing the problem, so please do resolve it Trying to get some variables. Some pointers may be invalid and cause the dump to abort... thd->query at 0x8c1ddd8 = select * from t1 thd->thread_id=1 The manual page at http://www.mysql.com/doc/en/Crashing.html contains information that should help you find out what is causing the crash. Number of processes running now: 0 070127 23:09:55 mysqld restarted