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Old 11-23-2007, 03:49 PM   #1
Stilltray
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Linux PC 'freezes'


I have a PC with RedHat Linux installed.
(The PC acts as server for a few third party applications.)

It runs without problems far more than a year.

But now, at regular times, weekly exactly the same time!, the PC 'freezes'?
2 Lights at the keyboard (NumLock and Scrollock?) and are flashing then.

There's nothing I can do at that moment besides a hardware reboot.

After rebooting I see in the messages files there has been no logging for a certain time, far before the reboot.
So the OS is 'freezing' in such a way there's even no logging possible.

The PC is part of a network.


How can I find out what the problem is?

Last edited by Stilltray; 11-23-2007 at 03:53 PM.
 
Old 11-23-2007, 04:01 PM   #2
ilikejam
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Hi.

The 2 flashing keyboard lights means the kernel has panicked. I'd suspect either bad RAM, a bad power supply, or a heat problem. My money's on the RAM going bad.

Grab a copy of memtest http://www.memtest.org/ and boot from that to check your RAM's OK. Also have a look at the output from 'sensors' to see if it's running hot.

Dave
 
Old 11-23-2007, 04:25 PM   #3
Stilltray
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Ok, I'll try that.

How is bad RAM related to 'freezing' at the same second every week? (Same active job/process what asks for resources not used until then?)
 
Old 11-23-2007, 05:02 PM   #4
ilikejam
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Don't know. Is there a cron job that runs between the last message and the crash?

Dave
 
Old 11-23-2007, 05:15 PM   #5
Stilltray
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I don't know the time between a job and the crash.
The only thing I see, after rebooting in the messages logfile that both machines have at exactly the same time their last logged message. Both machines are 'frozen'.


I see I've forgotten to mention that it's a combination of 2 PC's, with a third party application in clusterconfiguration.
 
Old 11-24-2007, 11:46 AM   #6
ilikejam
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Does the clustering software include kernel modules?
 
Old 11-24-2007, 04:21 PM   #7
Stilltray
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Yes they do.
But it has worked for more than one year without problems. Nothing has changed in software/kernel versions.
 
Old 11-24-2007, 04:28 PM   #8
ilikejam
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Whetever the problem is, it's going to be in the kernel modules for the cluster software. Userland issues shouldn't panic a system.

Dave
 
  


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