061124 20:53:31 [Warning] No argument was provided to --log-bin, and --log-bin-index was not used; so replication may break when this MySQL server acts as a master and has his hostname changed!! Please use '--log-bin=shella-bin' to avoid this problem. 061124 20:53:31 InnoDB: Started; log sequence number 0 45741 061124 20:53:31 [Note] libexec/mysqld: ready for connections. Version: '5.0.32-debug-log' socket: '/tmp/mysql_ssmirnova.sock' port: 0 Source distribution 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=16384 read_buffer_size=258048 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 = 31612 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. thd=0x99df498 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=0xb10b1058, backtrace may not be correct. Stack range sanity check OK, backtrace follows: 0x821a8e6 0x85c13bf 0x85be8f3 0x85c579e 0x830fe68 0x834e2d7 0x8351658 0x82391ad 0x823fdca 0x82408f6 0x8241eb1 0x8242375 0x45fbd4 0x3b74fe 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 0x9a03c98 = ALTER TABLE user MODIFY ssl_type enum('','ANY','X509', 'SPECIFIED') NOT NULL 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.