Re: [syzbot] WARNING in mntput_no_expire (3)

[Al Viro]

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.