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

[Dmitry Monakhov]

On Mon, 1 Apr 2013 02:30:47 -0400 (EDT), CAI Qian <caiqian@xxxxxxxxxx> wrote:
> 
> 
> ----- Original Message -----
> > From: "Dmitry Monakhov" <dmonakhov@xxxxxxxxxx>
> > To: "CAI Qian" <caiqian@xxxxxxxxxx>, "Theodore Ts'o" <tytso@xxxxxxx>
> > Cc: "LKML" <linux-kernel@xxxxxxxxxxxxxxx>, "linux-s390" <linux-s390@xxxxxxxxxxxxxxx>, "Steve Best"
> > <sbest@xxxxxxxxxx>, linux-ext4@xxxxxxxxxxxxxxx
> > Sent: Monday, April 1, 2013 2:07:35 PM
> > Subject: Re: s390x: kernel BUG at fs/ext4/inode.c:1591!
> > 
> > On Fri, 29 Mar 2013 05:27:02 -0400 (EDT), CAI Qian <caiqian@xxxxxxxxxx>
> > wrote:
> > > 
> > I've spent a half of weekend by trying to create s390x guest image,
> > without any success. Can you please share it.
> Well, do you have something like IBM system-Z?
> http://en.wikipedia.org/wiki/IBM_System_z10
> 
> Also can be reproduced on system-p,
> http://en.wikipedia.org/wiki/IBM_System_p
> 
Ohh... So you are lucky user of this black rocks and you
are the only person who can help to reproduce the issue.
BTW: Have you run kernel with the patch i've sent you?
> Never seen it on x86 so far though.
> CAI Qian
> > > 
> > > ----- Original Message -----
> > > > From: "Theodore Ts'o" <tytso@xxxxxxx>
> > > > To: "CAI Qian" <caiqian@xxxxxxxxxx>
> > > > Cc: "LKML" <linux-kernel@xxxxxxxxxxxxxxx>, "linux-s390"
> > > > <linux-s390@xxxxxxxxxxxxxxx>, "Steve Best"
> > > > <sbest@xxxxxxxxxx>, linux-ext4@xxxxxxxxxxxxxxx
> > > > Sent: Thursday, March 28, 2013 8:05:17 PM
> > > > 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?
> > > > > 
> > > > > Ã 1113.795759Â ------------Ã cut here Â------------
> > > > > Ã 1113.795771Â 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).
> > > Yes, the lastest mainline.
> > > > 
> > > > 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.
> > > bh->b_blocknr=100346
> > > pblock=66797
> > > 
> > > Bisecting results so far,
> > > git bisect start
> > > # good: [a937536b868b8369b98967929045f1df54234323] Linux 3.9-rc3
> > > git bisect good a937536b868b8369b98967929045f1df54234323
> > > # bad: [9064171268d838b8f283fe111ef086b9479d059a] Merge tag 'for-linus' of
> > > git://git.kernel.org/pub/scm/linux/kernel/git/sfr/next-fixes
> > > git bisect bad 9064171268d838b8f283fe111ef086b9479d059a
> > > # bad: [38d78e587d4960d0db94add518d27ee74bad2301] mqueue: sys_mq_open: do
> > > not call mnt_drop_write() if read-only
> > > git bisect bad 38d78e587d4960d0db94add518d27ee74bad2301
> > > # good: [e7489622d3603b7d161b484dcd340d9f678b0c7a] Merge tag 'arm64-fixes'
> > > of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64
> > > git bisect good e7489622d3603b7d161b484dcd340d9f678b0c7a
> > > # good: [172a271b5e090da7468c66b9ccbcdb3d929eed75] Merge branch 'drm-fixes'
> > > of git://people.freedesktop.org/~airlied/linux
> > > git bisect good 172a271b5e090da7468c66b9ccbcdb3d929eed75
> > > # good: [0a7e453103b9718d357688b83bb968ee108cc874] Merge branch 'next' of
> > > git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
> > > git bisect good 0a7e453103b9718d357688b83bb968ee108cc874
> > > # bad: [0e401101db49959f5783f6ee9e676124b5a183ac] ext4: fix memory leakage
> > > in mext_check_coverage
> > > git bisect bad 0e401101db49959f5783f6ee9e676124b5a183ac
> > > CAI Qian
> > > > 
> > > > Thanks,
> > > > 
> > > > 						- Ted
> > > > 
> > > --
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