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

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Date:	Sat, 10 Apr 2010 14:30:49 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Borislav Petkov <bp@...en8.de>
cc:	Johannes Weiner <hannes@...xchg.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.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 Sat, 10 Apr 2010, Borislav Petkov wrote:
> 
> Damn, nope, still no joy :(. It looked like it was fixed but one of the
> test was to hibernate right after the 3 kvm guests were shut down and I
> guess the mem freeing pattern kinda hits it where it most hurts.

Damn, I really hoped that was it. Three independent bugs found and fixed, 
and still no joy? Oh well.

> By the way, do we want to create a new thread - the mailchain is off the
> screen limits of my netbook :)

I prefer to keep it in one thread so that they all show up together if I 
need to, but feel free to start a new one. Not a biggie.

> [  647.492781] BUG: unable to handle kernel NULL pointer dereference at (null)
> [  647.493001] IP: [<ffffffff810c60a0>] page_referenced+0xee/0x1dc

Well, it sure is consistent. I'll start to think about what else could go 
wrong..

		Linus
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