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

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Message-ID: <CACT4Y+aQZ8KbU1C-sJ2PUKn_788SEKQpYGjoLaRDJrP9vXjs-A@mail.gmail.com>
Date:   Mon, 30 Apr 2018 15:24:48 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Dave Chinner <david@...morbit.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 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?