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

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Date:	Thu, 8 Apr 2010 00:55:28 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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, hannes@...xchg.org
Subject: Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon_vmas 
	of a mergeable VMA

Hi, Rik.

On Wed, Apr 7, 2010 at 11:54 PM, Rik van Riel <riel@...hat.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@...en8.de>
> Signed-off-by: Rik van Riel <riel@...hat.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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