linux-kernel - Re: [syzbot] WARNING in mntput_no

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Message-ID: <20210401183254.yup76gxvxk7foc3c@wittgenstein>
Date:   Thu, 1 Apr 2021 20:32:54 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     syzbot <syzbot+c88a7030da47945a3cc3@...kaller.appspotmail.com>
Cc:     axboe@...nel.dk, chaitanya.kulkarni@....com, damien.lemoal@....com,
        hch@....de, johannes.thumshirn@....com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: Re: [syzbot] WARNING in mntput_no_expire (2)

On Thu, Apr 01, 2021 at 05:16:03AM -0700, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit 73d90386b559d6f4c3c5db5e6bb1b68aae8fd3e7
> Author: Damien Le Moal <damien.lemoal@....com>
> Date:   Thu Jan 28 04:47:27 2021 +0000
> 
>     nvme: cleanup zone information initialization
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1440e986d00000
> start commit:   d19cc4bf Merge tag 'trace-v5.12-rc5' of git://git.kernel.o..
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=1640e986d00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1240e986d00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d1a3d65a48dbd1bc
> dashboard link: https://syzkaller.appspot.com/bug?extid=c88a7030da47945a3cc3
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12f50d11d00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=137694a1d00000
> 
> Reported-by: syzbot+c88a7030da47945a3cc3@...kaller.appspotmail.com
> Fixes: 73d90386b559 ("nvme: cleanup zone information initialization")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

That seems like a bogus bisect. Please see the bisect I provided in the
thread which seems more likely (Fyi, b4 mbox on the original thread
should help to get at those messages.).

Christian