Server hangs

Posted on 2011-09-10
Last Modified: 2012-05-12

After 4 months of perfect work my server with opensuse 11.4 started to freeze. When I'm trying to login into it from another server in the same network I get just the following message:
Last login: Sat Sep 10 23:17:38 2011 from blablabla
Have a lot of fun...

and nothing else. From my home pc I can't even get connected with it, just form the neighbour server.
I have 16 Gb of ram and don't believe that swap gets full..Also I have cron job, that is running every 2 min and killing those processes that are using more than 90% of cpu. So it shouldn't be the overload issue either..

Could somebody explain such server behaivior and how to find the cause ? (no error logs)
Question by:tanel
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LVL 21

Expert Comment

ID: 36517379
Also I have cron job, that is running every 2 min and killing those processes that are using more than 90% of cpu.

That is not a wise thing to do, and is probably the source of your problem.  Have you tried commenting out that cron job and rebooting to start fresh?  Who knows what that cron job killed that shouldn't have been...

Author Comment

ID: 36517413
I have another server, where autokill cron script is setup to 85% of cpu and everything is fine.
And as I mentioned before the server was stable almost for 5 months and the script kills the processes just with specific name (top -n 1 -b | grep "hlds_i686"). So, any system process can't be killed.
LVL 21

Expert Comment

ID: 36517423
the script kills the processes just with specific name (top -n 1 -b | grep "hlds_i686")

You didn't say that at first, you said "those processes that are using more than 90% of cpu".

Are you able to login via console?  Is the problem happening to all users?  Have you tried logging in from more than 1 other server?

What exactly do you mean by it's starting to freeze?  Is the only symptom here that you are having trouble logging in remotely or is there something else that makes you think the system is hanging?
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LVL 11

Expert Comment

ID: 36517526
It could well be an issue with HalfLife, can you post your debug.log please

Author Comment

ID: 36518273
Thanks for your replies!

Every time I have to go to datacentre for hard reboot, since I can't even directly send any command to the shell, it asks for password , accepts and nothing appears (with all system users). No any strange log in messages and the drive space is okey.

There are several hlds's running and it's hard to find the right debug log. Also if something gets to the debug log, the system tells about is in "messages" - "segmentation fault..." BUT always the last logs are as usual.  

I have SSD(with trim) , 16 GB ram and 2 Gb of swap installed. Is it possible, that some process can eat the whole ram and swap in 2 hours ? I don't even know if it's a kernel/OS or hardware issue.. The first step i gonna do now is to switch the kernel with the default suse's one..

Author Comment

ID: 36519362
I've requested that this question be deleted for the following reason:

have to test
LVL 21

Expert Comment

ID: 36519363
I don't understand why this is being deleted in order to "test".

Accepted Solution

tanel earned 0 total points
ID: 36521751
Well, I have changed my recompiled (optimized for hlds) kernel with the opensuse't new one 3.0.4-2.
Also I have turned off cron job, that was every 5 minutes changing priority of hlds processes to -99 (chrt).

The cron for cpu checks is still runnig but i changd its frequency from 1 min to 3.
I made a new other cron for swap chekings.And every 4 minutes it logs the "free -m" output to the file. Lets see..
up 1 day  0:34,  1 user,  load average: 0.02, 0.02, 0.05

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Author Comment

ID: 36536100

After some hours of detailed log investigation I have found the CAUSE of freezing:

Sep 11 12:11:52 cs kernel: [  802.825331] [drm:pch_irq_handler] *ERROR* PCH poison interrupt

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Any thoughts ?

Author Comment

ID: 36536128
I google it and it has to be some 2.6.38 kernel issue, that I have been using before..
If someone has more information please let me know.

Author Closing Comment

ID: 36902138
Fixed by myself.

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