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

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Message-Id: <20100406120315.53ad7390.akpm@linux-foundation.org>
Date:	Tue, 6 Apr 2010 12:03:15 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Borislav Petkov <bp@...en8.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	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)

On Tue, 6 Apr 2010 11:28:52 -0700 (PDT)
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> For example, maybe some list corruption causes us to do that 
> "anon_vma_chain_link()" _twice_ on the same avc entry. So we do that 
> "list_add_tail(&avc->same_anon_vma, &anon_vma->head);" on an entry that 
> already had "same_anon_vma" on one list.

The lib/list_debug.c stuff might detect such things.  I wonder if
either Borislav or Steinar had CONFIG_DEBUG_LIST enabled?
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