linux-kernel - Re: OOM killer, page fault

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Date:	Thu, 5 Nov 2009 16:26:26 +0100
From:	Norbert Preining <preining@...ic.at>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm <linux-mm@...ck.org>
Subject: Re: OOM killer, page fault

Hi Kim,

> > sorry for the late reply. I have two news, one good and one bad: The good
> > being that I can reproduce the bug by running VirtualBox with some W7
> 
> W7 means "Windows 7"?

Yes, sorry for the shorthand.

> > I know it sounds completely crazy, the patch only does harmless things
> > afais. But I tried it. Several times. rc6+patch never did boot, while
> > rc5 without path did boot. Then I patched it into -rc5, recompiled, and
> > boom, no boot. booting into .31.5, recompiling rc6 and rc5 without
> > that patch and suddenly rc6 boots (and I am sure rc5, too).
> 
> Hmm. It's out of my knowledge.
> Probably, It's because WARN_ON?
> Could you try it with omitting WARN_ON, again?

Will do that.

> > Ah yes, I can reproduce the original strange bug with oom killer!
> 
> Sounds good to me.
> Could you tell me your test scenario, your system info(CPU, RAM) and
> config?
> I want to reproduce it in my mahchine to not bother you. :)

Puhh, well, I meant "I could reproduce it", but not "I have a clear
idea what steps to be taken to reproduce it" ;-) Well here is what I can
tell you:
actual hardware:
Intel(R) Core(TM)2 Duo CPU     P9500
Memory 2G
Config of my kernel attached.

Virtual Machine (VirtualBox, not the OSE variant, I need USB 2.0 support
for GPS stuff):
VirtualBox 3.0.10
memory for the machine: 1G (50%)
ACPI and IO/APIC turned on
1 processor with PAE/NX
VT-x and Nested Paging activated
Display 128M
(need more details?)

I will remove the WARN_ON and reboot and see if that works. If yes I try
to recreate the problem.

Best wishes

Norbert

-------------------------------------------------------------------------------
Dr. Norbert Preining                                        Associate Professor
JAIST Japan Advanced Institute of Science and Technology   preining@...st.ac.jp
Vienna University of Technology                               preining@...ic.at
Debian Developer (Debian TeX Task Force)                    preining@...ian.org
gpg DSA: 0x09C5B094      fp: 14DF 2E6C 0307 BE6D AD76  A9C0 D2BF 4AA3 09C5 B094
-------------------------------------------------------------------------------
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