linux-kernel - Re: 2.6.19 file content corruption on ext3

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Message-Id: <20061217040620.91dac272.akpm@osdl.org>
Date:	Sun, 17 Dec 2006 04:06:20 -0800
From:	Andrew Morton <akpm@...l.org>
To:	andrei.popa@...eo.ro
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Hugh Dickins <hugh@...itas.com>,
	Linus Torvalds <torvalds@...l.org>,
	Florian Weimer <fw@...eb.enyo.de>,
	Marc Haber <mh+linux-kernel@...schlus.de>
Subject: Re: 2.6.19 file content corruption on ext3

On Sun, 17 Dec 2006 02:13:18 +0200
Andrei Popa <andrei.popa@...eo.ro> wrote:

> Hello,
> I had filesystem data corruption with rtorrent with 2.6.19.
> I tried recent git with Peter Zijlstra patch
> http://lkml.org/lkml/2006/12/16/144 and it seems that the problem is
> fixed.
> 

oh crap, I'd forgotten that test_clear_page_dirty() now fiddles with the
ptes.

I'd be really surprised if this was all due to a race though.  Is everyone
who has observed this problem running SMP and/or premptible kernels?

Peter, why isn't that proposed patch's cleaning of the pte racy against
do_wp_page()?
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