I've been getting this error almost twice a week for the past month and haven't been able to track down the source. I'm assuming it's some kind of InnoDB table corruption but have not been able to track down a specific table (we have over 100k tables).
Quote
121202 1:38:54 InnoDB: Assertion failure in thread 140707766650624 in file ha_innodb.cc line 4220
InnoDB: Failing assertion: share->idx_trans_tbl.index_count == mysql_num_index
InnoDB: We intentionally generate a memory trap.
InnoDB: Submit a detailed bug report to x
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:
InnoDB: about forcing recovery.
01:38:54 UTC - 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.
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=33554432
read_buffer_size=131072
max_used_connections=136
max_threads=500
thread_count=16
connection_count=16
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1126889 K bytes of memory
Hope that's ok; if not, decrease some variables in the equation.
Thread pointer: 0x88dd16c0
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 = 7ff91472be58 thread_stack 0x40000
/usr/sbin/mysqld(my_print_stacktrace+0x35)[0x7a3ec5]
/usr/sbin/mysqld(handle_fatal_signal+0x4a4)[0x67f894]
/lib64/libpthread.so.0(+0xf4a0)[0x7ffbc66644a0]
/lib64/libc.so.6(gsignal+0x35)[0x7ffbc581e885]
/lib64/libc.so.6(abort+0x175)[0x7ffbc5820065]
/usr/sbin/mysqld[0x7fbe18]
/usr/sbin/mysqld(_ZN7handler7ha_openEP5TABLEPKcii+0x3e)[0x6818ae]
/usr/sbin/mysqld(_ZN12ha_partition4openEPKcij+0x36d)[0x95553d]
/usr/sbin/mysqld(_ZN7handler7ha_openEP5TABLEPKcii+0x3e)[0x6818ae]
/usr/sbin/mysqld(_Z21open_table_from_shareP3THDP11TABLE_SHAREPKcjjjP5TABLEb+0x58c)[0x6001dc]
/usr/sbin/mysqld(_Z10open_tableP3THDP10TABLE_LISTP11st_mem_rootP18Open_table_context+0xc53)[0x5535c3]
/usr/sbin/mysqld(_Z11open_tablesP3THDPP10TABLE_LISTPjjP19Prelocking_strategy+0x486)[0x5542d6]
/usr/sbin/mysqld(_Z20open_and_lock_tablesP3THDP10TABLE_LISTbjP19Prelocking_strategy+0x44)[0x554d24]
/usr/sbin/mysqld[0x5830a4]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x1216)[0x586a26]
/usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x333)[0x58a323]
/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x15b2)[0x58b982]
/usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0xd7)[0x623a97]
/usr/sbin/mysqld(handle_one_connection+0x51)[0x623bd1]
/lib64/libpthread.so.0(+0x77f1)[0x7ffbc665c7f1]
/lib64/libc.so.6(clone+0x6d)[0x7ffbc58d170d]
Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (7ff73ac24930): is an invalid pointer
Connection ID (thread ID): 5798290
Status: NOT_KILLED
The manual page at x contains
information that should help you find out what is causing the crash.
121202 01:38:57 mysqld_safe Number of processes running now: 0
I've left the general log on a few times while the crash happened and then tested all the databases that were being used prior to the crash and didn't find any issues.
I've also restored from a snapshot from our other master (via ec2-consistent-snapshot) and let it catch up via replication, but I'm continuing to see the assertion failures pop up. 5 days will go by without issue, taking both reads and writes, but then it'll crash. Then after recovery it will immediately crash 2 days later. Rinse/repeat.
Can anybody point me in the right direction? Dumping the entire data set and creating a new server is not an option, as the data is > 1.4 TB. We're running MySQL 5.5.22 on a CentOS 6 EC2 instance.