Thanks for the reply. I apologize, I should have been more clear with my
first paragraph in my email. I have found several other somewhat similar
problems with MySQL on FreeBSD 6.0 but with the MySQL 4.1.x series.
Nothing in the Bug report you suggested bears much resemblance at first
glance. I originally thought this was a too many connections for the
server (physical server) problem, so I dropped the max connections to 20
and still got a signal 10. I also played with other numbers as the max
connections but no matter what about once an hour a SIGBUS error would
appear.
I have enabled --log and --core-file on my mysql server and I am trying
to determine if a specific query is causing the problem, however I
highly doubt this. Hopefully when it crashes the core file will be able
to shed some light on the problem at hand.
Just as I was typing I had tail running on the log file and error log
files and I caught a signal 10, at the time there was no query that
stood out that hadn't been queried previously. If you like I could send
the queries that preceded the signal 10, but I doubt they will do any
good. There are 4 queries and about 25 quits, in the minute leading up
to the crash.
I do have a core dump file and I am attempting to gather information,
however my knowledge on inspecting core dumps is limited, I am willing
to host the file somewhere if you care to look at it to help determine
the cause.
Many thanks.
Regards,
-Erik
Greg 'groggy' Lehey wrote:
On Monday, 31 July 2006 at 11:35:04 -0400, Erik Kristensen wrote:
I have an interesting issue with FreeBSD 6.0 and MySQL 5.0. Part of
my problem has been discussed serveral times in the past on other
mailing lists and it seems there has been fixes for older versions of
MySQL.
From what you say here, there's no reason to believe that your problem
has been mentioned at all.
The MySQL server is currently receiving a SIGNAL 10 about once an
hour, which is causing many problems with the innodb databases that
we have running on this server.
Signal 10 is SIGBUS (bus error), an error detected by the hardware.
The most frequent causes are bugs in the hardware and bugs in the
software. The only way to find out what causes the problem is to
investigate further. Never make the assumption that any two SIGBUS
problems are related. Still, SIGBUS is interesting, because just
about every such error in FreeBSD is reported as a SIGSEGV (signal
11).
I am running FreeBSD 6.0-RELEASE-p6 and MySQL 5.0.22.
In all the lists I have read regarding FreeBSD, MySQL and signal 10,
it all seems to happen with version 6.0 and the 4.1.x series of
MySQL.
I can't confirm that at all. I've been chasing a number of very
specific problems for some time, and as far as I can tell, there are
very few cases where the server crashes. One case that I'm
investigating is BUG#12251 (http://bugs.mysql.com/bug.php?id=12251).
If any of this looks familiar to you, please let me know.
Any help in this area would be greatly appreciate as this is our
production server having issues. We are a small company with limited
resources.
A start would be the documented method to track down crashes:
http://dev.mysql.com/doc/refman/5.0/en/debugging-server.html gives
details. In particular, the contents of the error log will give you
some idea, though probably you'll need a debugger to get a usable
backtrace.
Greg
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