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Subject: Re: XFS kernel BUG at fs/buffer.c:470! with 2.6.28.4
From: Alessandro Bono <alessandro.bono@gmail.com>
To: Dave Chinner <david@fromorbit.com>
Cc: Christoph Hellwig <hch@infradead.org>, linux-xfs <linux-xfs@oss.sgi.com>,
       linux-kernel <linux-kernel@vger.kernel.org>
In-Reply-To: <20090210104304.GP8830@disturbed>
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Date: Tue, 10 Feb 2009 11:53:14 +0100
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On Tue, 2009-02-10 at 21:43 +1100, Dave Chinner wrote:
> On Mon, Feb 09, 2009 at 02:53:08AM -0500, Christoph Hellwig wrote:
> > On Sun, Feb 08, 2009 at 11:45:20PM +0100, Alessandro Bono wrote:
> > > sure, attached
> > 
> > That would be a missing PagePrivate bit in page_buffers() called from
> > end_buffer_async_write.  PG_private can only be cleared via drop_buffers
> > which requires the page not having PG_writeback set which must be
> > set until end_buffer_async_write is done.  Very strange, and all this
> > is generic code without xfs involvement.  Did this happen once
> > or can you reproduce it?
> 
> Hmmmm - i wonder if this has anything to do with the writeback fixes
> that went into 2.6.28.2? Alessandro, can you revert to 2.6.28.1 (not
> plain 2.6.28) and see if you can reproduce the problem?

no problem 
I'll try with 2.6.28.1 a full rsync (circa 210G)
maybe I can do this today


> 
> Cheers,
> 
> Dave.
-- 
---
Cordiali Saluti
Alessandro Bono