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

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Message-ID: <4BBC913E.5050703@grupopie.com>
Date:	Wed, 07 Apr 2010 15:05:50 +0100
From:	Paulo Marques <pmarques@...popie.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
CC:	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)

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.

-- 
Paulo Marques - www.grupopie.com

"Don't worry, you'll be fine; I saw it work in a cartoon once..."
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