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

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Date:   Wed, 18 May 2022 01:58:40 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     syzbot <syzbot+5b1e53987f858500ec00@...kaller.appspotmail.com>
Cc:     hdanton@...a.com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING in mntput_no_expire (3)

On Wed, May 18, 2022 at 01:10:20AM +0000, Al Viro wrote:
> On Wed, May 18, 2022 at 12:59:46AM +0000, Al Viro wrote:
> > 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.
> 
> ... doesn't reproduce with genuine systemd either.  FWIW, 4-way SMP
> setup here.

OK, reproduced...