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

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Message-Id: <20100407191108.FB87.A69D9226@jp.fujitsu.com>
Date:	Wed,  7 Apr 2010 19:12:36 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	kosaki.motohiro@...fujitsu.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	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,
	Christoph Lameter <cl@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>
Subject: Re: Ugly rmap NULL ptr deref oopsie on hibernate (was Linux  2.6.34-rc3)

> Hi Linus,
> 
> On Wed, Apr 7, 2010 at 3:10 AM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
> > Sounds at least possible. Way more likely than any of the "trivially
> > obvious" code being buggy, or the SLUB layer suddenly having a serious bug
> > that only the new user could trigger.
> 
> I haven't followed the discussion at all but if someone wants to
> investigate that angle more, the most likely suspect are the recent
> per-cpu changes. That said, I'd expect the problem to be more
> widespread if SLUB is to blame here.

Nope. We don't doubt SLUB nor per-cpu anymore. Rik found the bug in his patch.

thanks.



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