linux-kernel - Re: [RFC] [PATCH] cpuset operations causes Badness at mm/slab.c:777 warning

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Message-ID: <Pine.LNX.4.64.0706011444010.5009@schroedinger.engr.sgi.com>
Date:	Fri, 1 Jun 2007 14:45:27 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Srinivasa Ds <srinivasa@...ibm.com>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Dinakar Guniguntala <dino@...ibm.com>, pj@....com,
	simon.derr@...l.net, clameter@...ulhu.engr.sgi.com,
	rientjes@...gle.com
Subject: Re: [RFC] [PATCH] cpuset operations causes Badness at mm/slab.c:777
 warning

On Fri, 1 Jun 2007, Andrew Morton wrote:

> Poisoning and redzoning could have caught that.

Redzoning would not have caught it. This was a kmalloc allocation and 
SLAB always gave them 32 bytes to play with. Only writes more than 32 
bytes behind would have been caught.

Poisoning is only applicable to unallocated objects and these were 
allocated.

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