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Date:   Wed, 18 May 2022 00:59:46 +0000
From:   Al Viro <viro@zeniv.linux.org.uk>
To:     syzbot <syzbot+5b1e53987f858500ec00@syzkaller.appspotmail.com>
Cc:     hdanton@sina.com, linux-kernel@vger.kernel.org,
        syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] WARNING in mntput_no_expire (3)
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References: <20220517223806.2299-1-hdanton@sina.com>
 <000000000000be329205df3cf252@google.com>
 <YoQohxAFD3EPujRC@zeniv-ca.linux.org.uk>
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On Tue, May 17, 2022 at 10:58:15PM +0000, Al Viro wrote:
> On Tue, May 17, 2022 at 03:49:07PM -0700, syzbot wrote:
> > Hello,
> > 
> > syzbot has tested the proposed patch but the reproducer is still triggering an issue:
> > WARNING in mntput_no_expire
> 
> Obvious question: which filesystem it is?

FWIW, can't reproduce here - at least not with C reproducer +
-rc7^ kernel + .config from report + debian kvm image (bullseye,
with systemd shite replaced with sysvinit, which might be relevant).

In case systemd-specific braindamage is needed to reproduce it...
Hell knows; at least mount --make-rshared / doesn't seem to suffice.