linux-kernel - Re: 2.6.18 ext3 panic.

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Message-ID: <20061010131603.GL23622@atrey.karlin.mff.cuni.cz>
Date:	Tue, 10 Oct 2006 15:16:03 +0200
From:	Jan Kara <jack@...e.cz>
To:	Eric Sandeen <sandeen@...deen.net>, Andrew Morton <akpm@...l.org>,
	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	esandeen@...hat.com, Badari Pulavarty <pbadari@...ibm.com>
Subject: Re: 2.6.18 ext3 panic.

> On Mon, 2006-10-09 14:46:30 -0500, Eric Sandeen <sandeen@...deen.net> wrote:
> > Andrew Morton wrote:
> > > On Tue, 03 Oct 2006 00:43:01 -0500
> > > Eric Sandeen <sandeen@...deen.net> wrote:
> > > > Dave Jones wrote:
> > > > > So I managed to reproduce it with an 'fsx foo' and a
> > > > > 'fsstress -d . -r -n 100000 -p 20 -r'. This time I grabbed it from
> > > > > a vanilla 2.6.18 with none of the Fedora patches..
> > > > >
> > > > > I'll give 2.6.18-git a try next.
> > > > >
> > > > > ----------- [cut here ] --------- [please bite here ] ---------
> > > > > Kernel BUG at fs/buffer.c:2791
> > > > I had thought/hoped that this was fixed by Jan's patch at 
> > > > http://lkml.org/lkml/2006/9/7/236 from the thread started at 
> > > > http://lkml.org/lkml/2006/9/1/149, but it seems maybe not.  Dave hit this bug 
> > > > first by going through that new codepath....
> > > 
> > > Yes, Jan's patch is supposed to fix that !buffer_mapped() assertion.  iirc,
> > > Badari was hitting that BUG and was able to confirm that Jan's patch
> > > (3998b9301d3d55be8373add22b6bc5e11c1d9b71 in post-2.6.18 mainline) fixed
> > > it.
> > 
> > Looking at some BH traces*, it appears that what Dave hit is a truncate
> > racing with a sync...
> > 
> > truncate ...
> >   ext3_invalidate_page
> >     journal_invalidatepage
> >       journal_unmap buffer
> > 
> > going off at the same time as
> > 
> > sync ...
> >   journal_dirty_data
> >     sync_dirty_buffer
> >       submit_bh <-- finds unmapped buffer, boom.
> 
> Is this possibly related to the issues that are discussed in another
> thread? We're seeing problems while unlinking large files (usually get
> it within some hours with 200MB files, but couldn't yet reproduce it
> with 20MB.)
  I don't think this is related (BTW: I've run your test for 5 hours
without any luck ;( Maybe I'll try again for some longer time...).

									Honza
-- 
Jan Kara <jack@...e.cz>
SuSE CR Labs
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