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

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Message-ID: <20100406170543.GA25954@liondog.tnic>
Date:	Tue, 6 Apr 2010 19:05:43 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Rik van Riel <riel@...hat.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Minchan Kim <minchan.kim@...il.com>,
	Nick Piggin <npiggin@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>
Subject: Re: Ugly rmap NULL ptr deref oopsie on hibernate (was Linux
 2.6.34-rc3)

From: Rik van Riel <riel@...hat.com>
Date: Tue, Apr 06, 2010 at 10:38:18AM -0400

> This makes me wonder if perhaps the bug is a side effect
> of something Borislav (and the other reproducers) have
> in their kernel configuration, which we do not have.
> 
> Another (unlikely) thing is that the fix for the leak
> makes the bug go away.  Yes, very unlikely.
> 
> Borislav, could you please send us your .config ?

attached.

> Also, if you have the time, could you try out the
> patch (-v2) I mailed in a little up this thread
> that fixes the memory leak in anon_vma_fork?

Sure, building ontop of v2.6.34-rc3-288-gab195c5.

Will try to trigger it but let me remind you that it will take a while
since it doesn't happen everytime I suspend.

Any other printks or debug output which might be helpful to slap at the
site, page_referenced_anon() I mean?

> I suspect it should not change anything, but it
> could be useful to rule out anyway.
> 

-- 
Regards/Gruss,
    Boris.

View attachment "config-2.6.34-rc3" of type "text/plain" (62618 bytes)