RE: Mysterious reboot
- From: "Mike Loiterman" <mike@xxxxxxxxxxxxxx>
- Date: Thu, 16 Feb 2006 08:59:57 -0600
Alex de Kruijff <mailto:freebsd@xxxxxxxxxxxxxxx> wrote:
On Thu, Feb 16, 2006 at 01:46:19AM -0600, Mike Loiterman wrote:
Afte being up for more than two months, I just noticed that my ver
reliable and stable server mysteriously rebooted. I've had the same
hardware and system setup for more than a year and haven't ever
experienced anything like this before. I haven't added any new
hardware in a very long time. I did upgrade mysql this morning via
portupgrade, however.
The system appears to have crashed, as dmesg shows that the various
filesystems weren't unmounted correctly upon reboot, but aside from
that single error, nothing else points to what the problem was.
/var/log/messages just shows a user connectig via pop, and then the
next line is the machine booting.
We are having a pretty good rainstorm, but nothing else seems to
have lost power and I have several other machines in this space that
did not go down (servers, TVs, XBOX, laptops, etc).
The machine seems to have gone down around 11:23 PM, so I checked
/etc/cron to see if I had scheduled a job to be run at that time,
but there are no jobs scheduled to be run on or near this time.
Where can I begin to look for more clues as to why this machine
seems to have crashed? Where would a kernel core dump be or a mysql
core dump?
You can look at /var/log/messages and find core files with 'find /
-name \*.core'
I suspect the cause lies with your hardware. There might be something
broken that causes your computer to reboot spontaneous when
it gets busy
or hot and other times it just goes oke.
I just ran (/usr/ports/sysutils/stress/) stress -c 2 which floored the CPU
for the last five hours, while compiling emacs over and over. No crashes.
No problems. CPU load was over 8 at some points. No files found in the
search for *.core.
I've also been observing my system...even when mail load from these
mini-attacks is heaviest, maybe 800 messages a second, the system load barly
goes over idle. There appeas to have been two such attacks. It's a 2.8 ghz
machine with 3 gigs of RAM, it should be well able to handle that load even
for sustained periods of time.
The only real explanation was some sort of power fluctuation. I'll continue
to monitor it carefully, but there doesn't seem to be anyway to definitivly
identify the cause, but the machine crashing under load is looking less and
less likely.
If there is a problem, I suspect it will show up again within the next week
or so, otherwise I'll chalk it up to a random event in the unverse.
------------------------------
Mike Loiterman
grantADLER
Tel: 630-302-4944
Fax: 773-442-0992
Email: mike@xxxxxxxxxxxxxx
PGP Key: 0xD1B9D18E
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