From: Dave Chinner <david@fromorbit.com>
To: Alex Lyakas <alex@zadarastorage.com>
Cc: xfs@oss.sgi.com
Subject: Re: xfs_vm_releasepage() causing BUG at free_buffer_head()
Date: Wed, 20 Jul 2016 09:11:08 +1000 [thread overview]
Message-ID: <20160719231108.GH16044@dastard> (raw)
In-Reply-To: <143E2E5E912B4C348E8C62AA987F0506@alyakaslap>
On Mon, Jul 18, 2016 at 09:00:41PM +0300, Alex Lyakas wrote:
> Greetings XFS community,
>
> We have hit the following BUG [1].
>
> This is in free_buffer_head():
> BUG_ON(!list_empty(&bh->b_assoc_buffers));
XFS doesn't use the bh->b_assoc_buffers field at all, so nothing in
XFS should ever corrupt it. Do you have any extN filesystems active,
or any other filesystems/block devices that use bufferheads than
might have a use after free bug? e.g. a long time ago (circa
~2.6.16, IIRC) we had a bufferhead corruption problem detected in
XFS that was actually caused by a reiserfs use after free.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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next prev parent reply other threads:[~2016-07-19 23:11 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-18 18:00 xfs_vm_releasepage() causing BUG at free_buffer_head() Alex Lyakas
2016-07-18 20:18 ` Holger Hoffstätte
2016-07-19 8:43 ` Alex Lyakas
2016-07-19 11:24 ` Holger Hoffstätte
2016-07-19 23:05 ` Dave Chinner
2016-07-19 23:11 ` Dave Chinner [this message]
2016-07-20 9:42 ` Alex Lyakas
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