linux-kernel - Re: Ugly rmap NULL ptr deref oopsie on hibernate (was Linux 2.6.34-rc3)

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Message-ID: <20100407141334.GF12052@aftab>
Date:	Wed, 7 Apr 2010 16:13:34 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Paulo Marques <pmarques@...popie.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Nick Piggin <npiggin@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	sgunderson@...foot.com
Subject: Re: Ugly rmap NULL ptr deref oopsie on hibernate (was Linux
 2.6.34-rc3)

From: Paulo Marques <pmarques@...popie.com>
Date: Wed, Apr 07, 2010 at 03:05:50PM +0100

> Linus Torvalds wrote:
> > [...]
> > So it once more is 'anon_vma->head.next' that is crap, but now it's not 
> > NULL, it's that very odd 0x002e2e2e002e2e2e pattern (the %r13 has had 0x20 
> > subtracted from it, so that LSB of "0x0e" is actually _also_ a 0x2e).
> > 
> > What does '0x2e' mean? It's ASCII '.', but that doesn't really mean 
> > anything either.
> 
> Just a wild shot in the dark: it can be a couple of gray pixels with
> intensity 0x2e at some 32 bits per pixel mode. I say this because of the
> zero bytes there and someone mentioning seeing the problem when starting X.

I don't think those are related: the problem when X was starting happens
with Rik' newest patch and the funny %r13 value happened after enabling
SLUB debugging last night.

Thanks.

-- 
Regards/Gruss,
Boris.

--
Advanced Micro Devices, Inc.
Operating Systems Research Center
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