linux-kernel - Re: Kernel BUG at fs/mpage.c:489

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Message-Id: <20080213013255.b4ea534c.akpm@linux-foundation.org>
Date:	Wed, 13 Feb 2008 01:32:55 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Bart Dopheide <dopheide@....nl>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	Jens Axboe <jens.axboe@...cle.com>,
	Bartlomiej Zolnierkiewicz <mzolnier@...il.com>
Subject: Re: Kernel BUG at fs/mpage.c:489

On Wed, 13 Feb 2008 20:24:03 +1100 Nick Piggin <nickpiggin@...oo.com.au> wrote:

> BTW is it really true that the buffer can never be locked by
> anything else at this point?

It has been for the past five or six years.  With the page locked, nobody
else can get at that page.

> What about fsync_buffers_list?

They're metadata buffers, not regular file data.  Things might get ugly if
IO to /dev/sda went via that path, but it doesn't.

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