Description:
hello
I'm experiencing a big problem with Mysql every few days mysql server is crashing and after the database is restarting all the data is wiped away from the tables.
I'm Using MyISAM tables on CentOS 5.2 32bit installation the MySQL version is 5.0.67 community
this is the error I'm getting
080923 3:50:01 - 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=402653184
read_buffer_size=1048576
max_used_connections=1166
max_connections=16384
threads_connected=99
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_connections = 393216 K
bytes of memory
Hope that's ok; if not, decrease some variables in the equation.
thd=0x8a4b2620
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=0x95a8ce48, backtrace may not be correct.
Stack range sanity check OK, backtrace follows:
0x81d4305
0x81d9a14
0x81f384f
0x4b646b
0x40ddbe
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 (nil) is invalid pointer
thd->thread_id=70086344
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.
Number of processes running now: 0
080923 03:50:02 mysqld restarted
080923 3:50:02 [Note] /usr/sbin/mysqld: ready for connections.
More general Infromation
I'm running the server on 2 X Quad core 2.5 MHz
16 GB Ram
MySQL database was moved to iscsi disks iostat output shows only 12% of disk utilization:
sda 1.20 264.00 2.00 1005.80 54.40 10206.40 10.18 11.55 11.45 0.13 12.87
load avg: load average: 3.52, 3.35, 3.01
I have 1 big table with 100,000 records which updates every 1 - 5 minutes ( no inserts or deletes) and several few more tables with 50 records which also updates every few minutes. I'm using only simple SQL queries such: "update table set data1='x1', data2='x2' where id='y'" and so on.
thanks in advance
Moshe Sharon
How to repeat:
It happens randomly
