Debugging random reboots

Posted by M132 on Ask Ubuntu See other posts from Ask Ubuntu or by M132
Published on 2014-08-21T02:18:49Z Indexed on 2014/08/21 4:31 UTC
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kernel

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reboot

I'm running Ubuntu 14.04 with 3.16.1 kernel compiled from source, and when I leave my PC running for a long time, it always reboots after about 4-8 days. Nothing is displayed on the screen, everything just freezes for about 3 seconds (and if there was any sound playing, it keeps repeating over and over), and then reboots. This issue also affects kernels compiled by Canonical's build bots.

I already tried to debug it with:

rsyslog
kexec-tools
netconsole kernel module

None of them seem to be working however. Are there any better methods to check, what exactly fails here? If there's an issue with RAM for example, shouldn't kernel report this in dmesg, or cause a kernel panic?

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