linux-kernel - Re: WARNING: bad unlock balance in xfs

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Date:   Wed, 2 May 2018 08:51:59 +1000
From:   Dave Chinner <david@...morbit.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+84a67953651a971809ba@...kaller.appspotmail.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        LKML <linux-kernel@...r.kernel.org>, linux-xfs@...r.kernel.org,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: WARNING: bad unlock balance in xfs_iunlock

On Mon, Apr 30, 2018 at 03:24:48PM +0200, Dmitry Vyukov wrote:
> On Thu, Apr 5, 2018 at 8:54 PM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> > On Tue, Apr 3, 2018 at 6:38 AM, Dave Chinner <david@...morbit.com> wrote:
> >> On Mon, Apr 02, 2018 at 07:01:02PM -0700, syzbot wrote:
> >>> Hello,
> >>>
> >>> syzbot hit the following crash on upstream commit
> >>> 86bbbebac1933e6e95e8234c4f7d220c5ddd38bc (Mon Apr 2 18:47:07 2018 +0000)
> >>> Merge branch 'ras-core-for-linus' of
> >>> git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> >>> syzbot dashboard link:
> >>> https://syzkaller.appspot.com/bug?extid=84a67953651a971809ba
> >>>
> >>> C reproducer: https://syzkaller.appspot.com/x/repro.c?id=5719304272084992
> >>> syzkaller reproducer:
> >>> https://syzkaller.appspot.com/x/repro.syz?id=5767783983874048
> >>
> >> What a mess. A hand built, hopelessly broken filesystem image made
> >> up of hex dumps, written into a mmap()d region of memory, then
> >> copied into a tmpfs file and mounted with the loop device.
> >>
> >> Engineers that can debug broken filesystems don't grow on trees.  If
> >> we are to have any hope of understanding what the hell this test is
> >> doing, the bot needs to supply us with a copy of the built
> >> filesystem image the test uses. We need to be able to point forensic
> >> tools at the image to decode all the structures into human readable
> >> format - if we are forced to do that by hand or jump through hoops
> >> to create our own filesystem image than I'm certainly not going to
> >> waste time looking at these reports...
> >
> > Hi Dave,
> >
> > Here is the image:
> > https://drive.google.com/file/d/1jzhGGe5SBJcqfsjxCLHoh4Kazke1oTfC/view
> 
> Have anybody looked at the bug and the image yet?

Yes, I did that a couple of weeks ago. Couldn't reproduce on a TOT
kernel here.

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com