140512 18:07:21 InnoDB: Assertion failure in thread 139752585459456 in file buf0buf.ic line 78 InnoDB: Failing assertion: i < srv_buf_pool_instances InnoDB: We intentionally generate a memory trap. InnoDB: Submit a detailed bug report to http://bugs.mysql.com. InnoDB: If you get repeated assertion failures or crashes, even InnoDB: immediately after the mysqld startup, there may be InnoDB: corruption in the InnoDB tablespace. Please refer to InnoDB: http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html InnoDB: about forcing recovery. 140512 18:07:21 [ERROR] mysqld got signal 6 ; 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 http://kb.askmonty.org/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: 5.5.37-MariaDB-wsrep-debug-log key_buffer_size=268435456 read_buffer_size=8388608 max_used_connections=6 max_threads=1002 thread_count=4 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 16697852 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. Thread pointer: 0x0x7f1ab7816060 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 = 0x7f1aaf366e48 thread_stack 0x48000 mysys/stacktrace.c:246(my_print_stacktrace)[0xd0a8da] sql/signal_handler.cc:155(handle_fatal_signal)[0x808055] /lib/x86_64-linux-gnu/libpthread.so.0(+0xf030)[0x7f1dc09cc030] /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x35)[0x7f1dbf66b475] /lib/x86_64-linux-gnu/libc.so.6(abort+0x180)[0x7f1dbf66e6f0] include/buf0buf.ic:79(buf_pool_from_bpage)[0xb50954] include/buf0buf.ic:340(buf_page_get_mutex)[0xb50d5a] buf/buf0lru.c:1925(buf_LRU_free_block)[0xb55b7c] buf/buf0lru.c:1055(buf_LRU_free_from_common_LRU_list)[0xb53670] buf/buf0lru.c:1104(buf_LRU_search_and_free_block)[0xb537b9] buf/buf0lru.c:1343(buf_LRU_get_free_block)[0xb54060] buf/buf0buf.c:2694(buf_page_get_gen)[0xb4245f] btr/btr0cur.c:640(btr_cur_search_to_nth_level)[0xb21f29] include/btr0pcur.ic:485(btr_pcur_open_with_no_init_func)[0xab2443] row/row0sel.c:4053(row_search_for_mysql)[0xab9938] handler/ha_innodb.cc:7693(ha_innobase::index_read(unsigned char*, unsigned char const*, unsigned int, ha_rkey_function))[0xa6933d] handler/ha_innodb.cc:8200(ha_innobase::rnd_pos(unsigned char*, unsigned char*))[0xa6a35e] sql/handler.h:2237(handler::rnd_pos_by_record(unsigned char*))[0x813ce9] sql/sql_class.h:4412(handler::ha_rnd_pos_by_record(unsigned char*))[0x8fa184] sql/log_event.cc:10642(Rows_log_event::find_row(Relay_log_info const*))[0x8f83fd] sql/log_event.cc:10962(Delete_rows_log_event::do_exec_row(Relay_log_info const*))[0x8f8f6a] sql/log_event.cc:8639(Rows_log_event::do_apply_event(Relay_log_info const*))[0x8f3d5b] sql/log_event.h:1257(Log_event::apply_event(Relay_log_info const*))[0x5b7d5a] sql/slave.cc:2641(apply_event_and_update_pos(Log_event*, THD*, Relay_log_info*))[0x5afb96] sql/slave.cc:2801(exec_relay_log_event)[0x5b012b] sql/slave.cc:3670(handle_slave_sql)[0x5b25ae] /lib/x86_64-linux-gnu/libpthread.so.0(+0x6b50)[0x7f1dc09c3b50] /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f1dbf7150ed] Trying to get some variables. Some pointers may be invalid and cause the dump to abort. Query (0x0): Connection ID (thread ID): 4 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=off 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. Writing a core file 140512 18:08:10 mysqld_safe Number of processes running now: 0 140512 18:08:10 mysqld_safe WSREP: not restarting wsrep node automatically 140512 18:08:10 mysqld_safe mysqld from pid file /data/mysql-2/mysqld.pid ended