linux-kernel - Re: s390x: kernel BUG at fs/ext4/inode.c:1591!

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Date:	Fri, 29 Mar 2013 04:53:43 -0400 (EDT)
From:	CAI Qian <caiqian@...hat.com>
To:	Dmitry Monakhov <dmonakhov@...nvz.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-s390 <linux-s390@...r.kernel.org>,
	Steve Best <sbest@...hat.com>, linux-ext4@...r.kernel.org,
	"Theodore Ts'o" <tytso@....edu>
Subject: Re: s390x: kernel BUG at fs/ext4/inode.c:1591!



----- Original Message -----
> From: "Dmitry Monakhov" <dmonakhov@...nvz.org>
> To: "Theodore Ts'o" <tytso@....edu>, "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
> Sent: Thursday, March 28, 2013 10:56:37 PM
> Subject: Re: s390x: kernel BUG at fs/ext4/inode.c:1591!
> 
> On Thu, 28 Mar 2013 08:05:17 -0400, Theodore Ts'o <tytso@....edu>
> wrote:
> > 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.
> I've triggered this bug on before at the time i've worked on
> e4defrag functionality, but AFAIK all related issues was aready fixed
> and 013 has nothing with e4defrag.
> But still bh->b_blocknr under us. So other obvious place I suspect is
> puch_hole but this also not true because 013 use fsstress
> test in vegetarian mode: "-f rmdir=10 -f link=10 -f creat=10 -f
> mkdir=10
> -f rename=30 -f stat=30 -f unlink=30 -f truncate=20"
> So the only place I suspect is some unknown bug in extent status tree
> Can you please enable ES_AGGRESSIVE_TEST and rerun xfstest.
What is ES_AGGRESSIVE_TEST and how can it enable it?
> > 
> > Thanks,
> > 
> > 						- Ted
> > --
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