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Re: XFS kernel BUG at fs/buffer.c:470! with

To: Alessandro Bono <alessandro.bono@xxxxxxxxx>
Subject: Re: XFS kernel BUG at fs/buffer.c:470! with
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Mon, 9 Feb 2009 02:53:08 -0500
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, linux-xfs <linux-xfs@xxxxxxxxxxx>, linux-kernel <linux-kernel@xxxxxxxxxxxxxxx>
In-reply-to: <1234133120.12370.7.camel@xxxxxxxxxxxxxxxxx>
References: <1234011974.7435.11.camel@xxxxxxxxxxxxxxxxx> <20090208222859.GA2532@xxxxxxxxxxxxx> <1234132752.12370.0.camel@xxxxxxxxxxxxxxxxx> <20090208224249.GA11931@xxxxxxxxxxxxx> <1234133120.12370.7.camel@xxxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.18 (2008-05-17)
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?

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