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

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Message-ID: <YoRHfB7lEGUwQBGU@zeniv-ca.linux.org.uk>
Date:   Wed, 18 May 2022 01:10:20 +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 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.