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? |
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 |
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?) |
Don't know. Is there a cron job that runs between the last message and the crash?
Dave |
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. |
Does the clustering software include kernel modules?
|
Yes they do.
But it has worked for more than one year without problems. Nothing has changed in software/kernel versions. |
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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