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Date:	Thu, 28 Mar 2013 08:05:17 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	CAI Qian <caiqian@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-s390 <linux-s390@...r.kernel.org>,
	Steve Best <sbest@...hat.com>, linux-ext4@...r.kernel.org
Subject: Re: s390x: kernel BUG at fs/ext4/inode.c:1591!

On Thu, Mar 28, 2013 at 02:40:33AM -0400, CAI Qian wrote:
> System hung when running xfstests-dev 013 test case on an s390x guest. Never saw
> this on 3.9-rc3 before but need to double-check. Any idea?
> 
> Ý 1113.795759¨ ------------Ý cut here ¨------------
> Ý 1113.795771¨ kernel BUG at fs/ext4/inode.c:1591!

thanks for the report.  What kernel version did this come from?  Was
it 3.9-rc4?  (line 1591 for 3.9-rc3 doesn't contain a BUG_ON).

If it is indeed 3.9-rc4, it would be helpful, since you can reproduce
the problem, to insert a debugging printk which fires when
bh->b_blocknr != pblock before the BUG_ON, and have it print the
b_blocknr and pblock values.

Thanks,

						- Ted
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