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Date: Thu, 8 Apr 2010 00:55:28 +0900
Message-ID: <j2s28c262361004070855ib724f594y7c8f01ba8e785bdd@mail.gmail.com>
Subject: Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon_vmas 
	of a mergeable VMA
From: Minchan Kim <minchan.kim@gmail.com>
To: Rik van Riel <riel@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Borislav Petkov <bp@alien8.de>,
       Andrew Morton <akpm@linux-foundation.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
       Nick Piggin <npiggin@suse.de>, Andrea Arcangeli <aarcange@redhat.com>,
       Hugh Dickins <hugh.dickins@tiscali.co.uk>, sgunderson@bigfoot.com,
       hannes@cmpxchg.org
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Hi, Rik.

On Wed, Apr 7, 2010 at 11:54 PM, Rik van Riel <riel@redhat.com> wrote:
> When a new VMA has a mergeable anon_vma with a neighboring VMA,
> make sure all of the neighbor's old anon_vma structs are also
> linked in.
>
> This is necessary because at some point the VMAs could get merged,
> and we want to ensure no anon_vma structs get freed prematurely,
> while the system still has anonymous pages that belong to those
> structs.
>
> Reported-by: Borislav Petkov <bp@alien8.de>
> Signed-off-by: Rik van Riel <riel@redhat.com>

At last, you might find culprit.

AFAIU your descriptoin, don't we have to care vma_merge case, too?
Sorry if it is dumb question.

-- 
Kind regards,
Minchan Kim
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