linux-kernel - Re: frequent slab corruption (since a long time)

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Message-ID: <p73fygfzu2v.fsf@verdi.suse.de>
Date:	02 Aug 2006 05:37:28 +0200
From:	Andi Kleen <ak@...e.de>
To:	Dave Jones <davej@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: frequent slab corruption (since a long time)

Dave Jones <davej@...hat.com> writes:

> Every so often, I see a slab corruption bug reported against
> the Fedora kernels (going back as far as 2.6.11), and it's
> still plagueing us.
> 
> It seems to have turned up in a number of different scenarios,
> which makes it all the more complicated, but the footprint is
> always the same. We write ffffffff00000000 to freed memory.

DEBUG_PAGEALLOC + a small slab patch to force the 2k slab to be
only a single object per page (so that a kfree() immediately
triggers an unmap) would catch it I guess.

-Andi
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