linux-kernel - Re: XFS kernel BUG at fs/buffer.c:470! with 2.6.28.4

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Message-ID: <20090209075308.GA7360@infradead.org>
Date:	Mon, 9 Feb 2009 02:53:08 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Alessandro Bono <alessandro.bono@...il.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	linux-xfs <linux-xfs@....sgi.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: XFS kernel BUG at fs/buffer.c:470! with 2.6.28.4

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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