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grimm26
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Joined: 23 May 2004
Posts: 313
Location: Chicagoland, IL

PostPosted: Tue Oct 07, 2014 12:53 am    Post subject: occasional hangs. Reply with quote

My server occasionally hangs. Suddenly I'll lose connection to it, but I can fix it by going up to it and hitting any key on the keyboard. This happens maybe every week or two.

dmesg shows me:
Code:
[Mon Oct  6 19:25:14 2014] Hangcheck: hangcheck value past margin!


Code:
# uname -a
Linux samsara 3.14.14-gentoo #1 SMP Thu Jul 31 11:59:18 CDT 2014 x86_64 AMD Athlon(tm) II X2 250 Processor AuthenticAMD GNU/Linux


Any ideas?
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Princess Nell
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Joined: 15 Apr 2005
Posts: 768

PostPosted: Tue Oct 07, 2014 9:09 pm    Post subject: Reply with quote

Your kernel is built with CONFIG_HANGCHECK_TIMER. My kernels don't, but it looks like a potentially useful setting that I wouldn't just remove.
https://oss.oracle.com/projects/hangcheck-timer/
http://puschitz.com/pblog/?cat=5
I'd try to figure out what happens on the system around the time of the event, maybe using sysstat or similar tools.

A few years ago, I had a similar problem with an IBM server (running RHEL3) that periodically dropped of the lan for a minute or two. Turned out it was the blob for the system board fakeraid, and a newer version fixed it.
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