linux-kernel - Re: repeatable slab corruption with LTP msgctl08

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Message-Id: <20080612020846.c77761cd.akpm@linux-foundation.org>
Date:	Thu, 12 Jun 2008 02:08:46 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Nadia Derbey <Nadia.Derbey@...l.net>,
	Manfred Spraul <manfred@...orfullife.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: repeatable slab corruption with LTP msgctl08

On Thu, 12 Jun 2008 10:35:55 +0200 Andi Kleen <andi@...stfloor.org> wrote:

> Andrew Morton <akpm@...ux-foundation.org> writes:
> >
> > Doing the same thing on 2.6.26-rc5-mm3, msgctl08 also runs to
> > completion, in 20.9 seconds.  So
> >
> > - it got slower
> 
> That is because it scales itself to the number of available msg queues.
> So with Nadia's patch there are more and it runs slower.
> 
> In fact it seems to start one process per message queue, so perhaps it's 
> just running out of processes or something. Ok it should not segfault.
> 
> BTW a great way to debug slab corruptions with LTP faster is to run with
> a slab thrasher stress module like http://firstfloor.org/~andi/crasher-26.diff
> 

Something like that might be needed.  I ran it again and it took 49
minutes to crash.

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