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PROBLEM: oom killer and swap weirdness on 2.6.3* kernels

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From: dave b
Subject: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels
Date: Friday, May 14, 2010 - 5:53 am

In 2.6.3* kernels (test case was performed on the 2.6.33.3 kernel)
when physical memory runs out and there is a large swap partition -
the system completely stalls.

I noticed that when running debian lenny using dm-crypt  with
encrypted / and swap with a  2.6.33.3 kernel (and all of the 2.6.3*
series iirc) when all physical memory is used (swapiness was left at
the default 60) the system hangs and does not respond. It can resume
normal operation some time later - however it seems to take a *very*
long time for the oom killer to come in. Obviously with swapoff this
doesn't happen - the oom killer comes in and does its job.


free -m
             total       used       free     shared    buffers     cached
Mem:          1980       1101        879          0         58        201
-/+ buffers/cache:        840       1139
Swap:        24943          0      24943


My simple test case is

dd if=/dev/zero of=/tmp/stall
and wait till /tmp fills...
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Messages in current thread:
PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, dave b, (Fri May 14, 5:53 am)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, dave b, (Fri May 14, 6:14 am)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, dave b, (Thu May 20, 12:27 am)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, Hugh Dickins, (Fri May 21, 2:18 pm)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, dave b, (Wed May 26, 8:45 pm)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, David Rientjes, (Tue Jun 1, 1:52 pm)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, dave b, (Mon Jul 26, 7:05 am)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, David Rientjes, (Mon Jul 26, 3:12 pm)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, dave b, (Mon Jul 26, 9:39 pm)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, KOSAKI Motohiro, (Mon Jul 26, 9:46 pm)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, dave b, (Mon Jul 26, 9:49 pm)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, KOSAKI Motohiro, (Mon Jul 26, 11:09 pm)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, dave b, (Tue Jul 27, 1:09 am)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, dave b, (Tue Jul 27, 3:40 am)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, KOSAKI Motohiro, (Tue Jul 27, 4:14 am)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, dave b, (Tue Jul 27, 4:26 am)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, KOSAKI Motohiro, (Tue Jul 27, 10:06 pm)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, dave b, (Wed Jul 28, 12:14 am)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, dave b, (Thu Jul 29, 2:47 am)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, dave b, (Thu Jul 29, 2:48 am)
Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels, dave b, (Tue Sep 21, 6:01 am)