From: Tom Date: November 22 2012 1:16am Subject: Innodb, MySQL 5.5.28 - Would an incorrect setting in my.cnf cause mysqld to randomly crash on high load? List-Archive: http://lists.mysql.com/mysql/228673 Message-Id: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 We have a high-end server, 128GB RAM, 32 Core , Xeon, SSD RAID 10 - running Ubuntu 12.04 with MySQL 5.5.28 . Doing random imports to large InnoDB tables, over 50+ gigs, randomly after a few hours of heavy load, mysql does a Signal 11 and crashes. We have tried to move hardware. Doing a full dump (but not a restore yet) gives no issues. Usually on corrupted tables, a dump would fail no? Below is the crash log and my.cnf . --- 12:45:4 UTC - 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=536870912 read_buffer_size=131072 max_used_connections=324 max_threads=200 thread_count=308 connection_count=308 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 965187 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. Thread pointer: 0x7fc7eb1b5040 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 = 7fadf6abfe60 thread_stack 0x30000 /usr/sbin/mysqld(my_print_stacktrace+0x29)[0x7fc758522759] /usr/sbin/mysqld(handle_fatal_signal+0x483)[0x7fc7583e9ae3] /lib/x86_64-linux-gnu/libpthread.so.0(+0xfcb0)[0x7fc75713bcb0] /usr/sbin/mysqld(+0x6671b0)[0x7fc75863a1b0] /usr/sbin/mysqld(+0x61d6b9)[0x7fc7585f06b9] /usr/sbin/mysqld(+0x630d12)[0x7fc758603d12] /usr/sbin/mysqld(+0x6319c2)[0x7fc7586049c2] /usr/sbin/mysqld(+0x631d85)[0x7fc758604d85] /usr/sbin/mysqld(+0x626e7d)[0x7fc7585f9e7d] /usr/sbin/mysqld(+0x633cea)[0x7fc758606cea] /usr/sbin/mysqld(+0x6347e2)[0x7fc7586077e2] /usr/sbin/mysqld(+0x624426)[0x7fc7585f7426] /usr/sbin/mysqld(+0x610871)[0x7fc7585e3871] /usr/sbin/mysqld(+0x5d4cb0)[0x7fc7585a7cb0] /usr/sbin/mysqld(+0x5b7c9c)[0x7fc75858ac9c] /usr/sbin/mysqld(_ZN7handler21read_multi_range_nextEPP18st_key_multi_range+0x24)[0x7fc7583e9fe4] /usr/sbin/mysqld(_ZN18QUICK_RANGE_SELECT8get_nextEv+0x3c)[0x7fc7584a3c8c] /usr/sbin/mysqld(+0x4e9195)[0x7fc7584bc195] /usr/sbin/mysqld(_Z10sub_selectP4JOINP13st_join_tableb+0x71)[0x7fc7582f1741] /usr/sbin/mysqld(+0x32f025)[0x7fc758302025] /usr/sbin/mysqld(_ZN4JOIN4execEv+0x4a5)[0x7fc758311155] /usr/sbin/mysqld(_Z12mysql_selectP3THDPPP4ItemP10TABLE_LISTjR4ListIS1_ES2_jP8st_orderSB_S2_SB_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x130)[0x7fc75830d000] /usr/sbin/mysqld(_Z13handle_selectP3THDP3LEXP13select_resultm+0x17c)[0x7fc758312f5c] /usr/sbin/mysqld(+0x2f66b4)[0x7fc7582c96b4] /usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x16d8)[0x7fc7582d1118] /usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x10f)[0x7fc7582d5daf] /usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x1380)[0x7fc7582d7200] /usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x1bd)[0x7fc75837b7ad] /usr/sbin/mysqld(handle_one_connection+0x50)[0x7fc75837b810] /lib/x86_64-linux-gnu/libpthread.so.0(+0x7e9a)[0x7fc757133e9a] /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7fc756864cbd] Trying to get some variables. Some pointers may be invalid and cause the dump to abort. Query (7faa4c18e440): is an invalid pointer Connection ID (thread ID): 2286 Status: NOT_KILLED 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. 121120 12:48:48 [Note] Plugin 'FEDERATED' is disabled. 121120 12:48:48 InnoDB: The InnoDB memory heap is disabled 121120 12:48:48 InnoDB: Mutexes and rw_locks use GCC atomic builtins 121120 12:48:48 InnoDB: Compressed tables use zlib 1.2.3.4 121120 12:48:48 InnoDB: Initializing buffer pool, size = 96.0G 121120 12:48:56 InnoDB: Completed initialization of buffer pool 121120 12:48:57 InnoDB: highest supported file format is Barracuda. InnoDB: Log scan progressed past the checkpoint lsn 1341738337497 121120 12:48:58 InnoDB: Database was not shut down normally! InnoDB: Starting crash recovery. InnoDB: Reading tablespace information from the .ibd files... InnoDB: Restoring possible half-written data pages from the doublewrite InnoDB: buffer... InnoDB: Doing recovery: scanned up to log sequence number 1341743580160 InnoDB: Doing recovery: scanned up to log sequence number 1341748823040 InnoDB: Doing recovery: scanned up to log sequence number 1341754065920 InnoDB: Doing recovery: scanned up to log sequence number 1341759308800 InnoDB: Doing recovery: scanned up to log sequence number 1341764551680 ... ================ my.cnf: =============== [client] port = 3306 socket = /var/run/mysqld/mysqld.sock [mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] skip-name-resolve innodb_file_per_table default_storage_engine=InnoDB user = mysql socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /data/mysql tmpdir = /tmp skip-external-locking key_buffer = 512M max_allowed_packet = 128M thread_stack = 192K thread_cache_size = 64 myisam-recover = BACKUP max_connections = 500 table_cache = 812 table_definition_cache = 812 #query_cache_limit = 4M #query_cache_size = 512M join_buffer_size = 512K innodb_additional_mem_pool_size = 20M innodb_buffer_pool_size = 96G #innodb_file_io_threads = 4 #innodb_thread_concurrency = 12 innodb_flush_log_at_trx_commit = 1 innodb_log_buffer_size = 8M innodb_log_file_size = 1024M innodb_log_files_in_group = 2 innodb_max_dirty_pages_pct = 90 innodb_lock_wait_timeout = 120 log_error = /var/log/mysql/error.log long_query_time = 5 slow_query_log = 1 slow_query_log_file = /var/log/mysql/slowlog.log [mysqldump] quick quote-names max_allowed_packet = 16M [mysql] [isamchk] key_buffer = 16M ====== Memory usage, disk space is fine. This only happens during high I/O. Would anything in the my.cnf file be causing this issue? tia.