linux-kernel - Re: kmemcheck caught read from freed memory (cfq_free_io

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Message-ID: <84144f020804020418j51eb0e63s82f438398ff1b6ad@mail.gmail.com>
Date:	Wed, 2 Apr 2008 14:18:34 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>
Cc:	"Jens Axboe" <jens.axboe@...cle.com>, paulmck@...ux.vnet.ibm.com,
	"Ingo Molnar" <mingo@...e.hu>,
	"Vegard Nossum" <vegard.nossum@...il.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Christoph Lameter" <clameter@....com>
Subject: Re: kmemcheck caught read from freed memory (cfq_free_io_context)

On Wed, 2008-04-02 at 14:11 +0300, Pekka Enberg wrote:
> > Nothing. So you cannot access the object at all after you've called
> > kmem_cache_free(). SLAB_RCU or no SLAB_RCU.

On Wed, Apr 2, 2008 at 2:14 PM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
>  Well, you can, but you have to validate you get the object you were
>  looking for.

Yes. I keep forgetting that. Sorry.
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