linux-kernel - Re: 2.6.25-rc6: BUG: unable to handle kernel NULL pointer dereference

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Message-ID: <20080328102535.GD633@elte.hu>
Date:	Fri, 28 Mar 2008 11:25:35 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Christian Kujau <lists@...dbynature.de>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Markus Rehbach <markus.rehbach@....de>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: 2.6.25-rc6: BUG: unable to handle kernel NULL pointer
	dereference


* Christian Kujau <lists@...dbynature.de> wrote:

> On Thu, 27 Mar 2008, Thomas Gleixner wrote:
>> I had a lengthy bug decoding session with Ingo and we found the root
>> cause:
>> A dropped workaround for the prefetch bug in early X2s and
>> Opterons. Patch below.
>
> Although I reported it, I could not repoduce the bug. Anyway, I've 
> applied your patch to -rc7 and no BUG so far :)

yeah, the condition would normally be very sporadic and it can easily 
depend on a specific layout of your kernel image, etc.

the (updated) fix is in Linus' latest git tree as well, and in 
x86.git/latest.

	Ingo
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