linux-kernel - Re: running of out memory => kernel crash

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Message-ID: <alpine.DEB.2.00.1108090900170.30199@chino.kir.corp.google.com>
Date:	Tue, 9 Aug 2011 09:03:39 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Mahmood Naderan <nt_mahmood@...oo.com>
cc:	Randy Dunlap <rdunlap@...otime.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org
Subject: Re: running of out memory => kernel crash

On Tue, 9 Aug 2011, Mahmood Naderan wrote:

> >Do you have any kernel log panic/oops/Bug messages?
>  
> Actually, that happened for one my diskless nodes 10 days ago.
> What I saw on the screen (not the logs), was 
> "running out of memory.... kernel panic....."
> 

The only similar message in the kernel is "Out of memory and no killable 
processes..." and that panics the machine when there are no eligible 
tasks to kill.

If you're using cpusets or mempolicies, you must ensure that all tasks 
attached to either of them are not set to OOM_DISABLE.  It seems unlikely 
that you're using those, so it seems like a system-wide oom condition.  Do 
cat /proc/*/oom_score and make sure at least some threads have a non-zero 
badness score.  Otherwise, you'll need to adjust their 
/proc/pid/oom_score_adj settings to not be -1000.

Randy also added linux-mm@...ck.org to the cc, but you removed it; please 
don't do that.