linux-kernel - Re: [PATCH] kmemcheck: support for x86

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Message-ID: <48300248.7050701@firstfloor.org>
Date:	Sun, 18 May 2008 12:17:44 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Vegard Nossum <vegard.nossum@...il.com>
CC:	Pekka Enberg <penberg@...helsinki.fi>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [PATCH] kmemcheck: support for x86_64


> Most of them look something like this:
> 
> kmemcheck: Caught 8-bit read from freed memory (ffff81000780a904)
> ifffffffifffffffifffffffifffffffifffffffifffffffifffffffifffffff
>     ^
> 
> and my theory so far is that X86_64 uses some currently unhandled
> instruction set extensions like MMX, SSE, etc. (Not 3DNow! because we
> have a dependency for that), for a fairly common operation 

No it shouldn't. Only SSE users are in the (broken) MD RAID code

Most likely you don't decode REX correctly in some cases.

[haven't read the patch sorry]

=Andi


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