Hi all,
We've been having our master database server continually crash about once or
twice per week. The most recent output in the error log is contained at the
bottom of this message.
The funny part is, that not only is mysql crashing often, but we are also
seeing some very weird errors in some of our queries... such as:
[nativecode=1062 ** Duplicate entry 'aa59442538' for key
That error comes from a query where the query actually has an ON DUPLICATE KEY
UPDATE clause.
Also, we're getting errors with crashed tables:
Table '****' is marked as crashed and should be repaired
A check table on that table and other tables usually results in invalid row
count (these are MyISAM tables). There is no pattern to the errors other than
that they tend to occur on high traffic tables.
We are running mysql version:
mysql Ver 14.12 Distrib 5.0.27
We are also running these mysql version elsewhere with no problems. I am
beginning to think more and more that this issue is related to the hardware of
the master server, not necessarilly the mysql version itself.
Although we do need to upgrade, does anyone know of any existing bugs in 5.0.27
that may be causing our issues? Or is this most likely a hardware issue?
Thanks,
Matt
One of the outputs in the Error log (there are many more):
Version: '5.0.27-standard-log' socket: '/var/lib/mysql/mysql.sock' port: 3306
MySQL Community Edition - Standard (GPL)
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=1073741824
read_buffer_size=131072
max_used_connections=19
max_connections=300
threads_connected=15
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_connections =
1701373 K
bytes of memory
Hope that's ok; if not, decrease some variables in the equation.
thd=0x2ac0865b40
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=0x450c9f78, backtrace may not be correct.
Stack range sanity check OK, backtrace follows:
0x5f7374656c796568
Stack trace seems successful - bottom reached
Please read http://dev.mysql.com/doc/mysql/en/Using_stack_trace.html and follow
instructions on how to resolve the stack trac
e. 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 0x2ac05362b0 is invalid pointer
thd->thread_id=15401
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.
mysqld: my_new.cc:51: int __cxa_pure_virtual(): Assertion `"Pure virtual method
called." == "Aborted"' failed.
Fatal signal 6 while backtracing
Number of processes running now: 0
070907 07:21:51 mysqld restarted
070907 7:21:51 InnoDB: Database was not shut down normally!
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