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From: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
To: "'Linus Torvalds'" <torvalds@osdl.org>,
       "David Miller" <davem@davemloft.net>
Cc: <ranma@tdiedrich.de>, <gordonfarquharson@gmail.com>, <tbm@cyrius.com>,
       "Peter Zijlstra" <a.p.zijlstra@chello.nl>, <andrei.popa@i-neo.ro>,
       "Andrew Morton" <akpm@osdl.org>, <hugh@veritas.com>,
       <nickpiggin@yahoo.com.au>, <arjan@infradead.org>,
       "Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH] mm: fix page_mkclean_one
Date: Wed, 27 Dec 2006 21:55:21 -0800
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Linus Torvalds wrote on Wednesday, December 27, 2006 7:05 PM
> On Wed, 27 Dec 2006, David Miller wrote:
> > > 
> > > I still don't see _why_, though. But maybe smarter people than me can see 
> > > it..
> > 
> > FWIW this program definitely triggers the bug for me.
> 
> Ok, now that I have something simple to do repeatable stuff with, I can 
> say what the pattern is.. It's not all that surprising, but it's still 
> worth just stating for the record.


Running the test code, git bisect points its finger at this commit. Reverting
this commit on top of 2.6.20-rc2 doesn't trigger the bug from the test code.


edc79b2a46ed854595e40edcf3f8b37f9f14aa3f is first bad commit
commit edc79b2a46ed854595e40edcf3f8b37f9f14aa3f
Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date:   Mon Sep 25 23:30:58 2006 -0700

    [PATCH] mm: balance dirty pages

    Now that we can detect writers of shared mappings, throttle them.  Avoids OOM
    by surprise.

    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Hugh Dickins <hugh@veritas.com>
    Signed-off-by: Andrew Morton <akpm@osdl.org>
    Signed-off-by: Linus Torvalds <torvalds@osdl.org>