linux-kernel - Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon

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Message-ID: <4BC08F25.3080600@redhat.com>
Date:	Sat, 10 Apr 2010 10:45:57 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	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
Subject: Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon_vmas
 of a mergeable VMA

On 04/10/2010 07:26 AM, Borislav Petkov wrote:

> This time we got stuck on the anon_vma->lock (yep, we've seen that
> oopsie before). So, it might be that we _really_ are staring at the
> wrong code... Back to square one.

This is a different bug, though.

If the null pointer dereference is gone, Linus's patch
fixed that bug and we can move forward to fixing the
anon_vma->lock bug.

I'll start auditing the code to see if we forget to
unlock the anon_vma in some unlikely error path...
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