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

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Message-Id: <1166358729.7770.0.camel@localhost>
Date:	Sun, 17 Dec 2006 14:32:09 +0200
From:	Andrei Popa <andrei.popa@...eo.ro>
To:	Andrew Morton <akpm@...l.org>
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


ierdnac ~ # uname -a
Linux ierdnac 2.6.20-rc1 #1 SMP PREEMPT Sun Dec 17 01:52:28 EET 2006
i686 Genuine Intel(R) CPU           T2050  @ 1.60GHz GenuineIntel
GNU/Linux


On Sun, 2006-12-17 at 04:06 -0800, Andrew Morton wrote:
> 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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