linux-kernel - Re: [PATCH 4.4 014/190] lockd: fix lockd shutdown race

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Date:   Wed, 16 May 2018 15:53:29 -0400
From:   "J. Bruce Fields" <bfields@...hat.com>
To:     Ben Hutchings <ben.hutchings@...ethink.co.uk>
Cc:     stable@...r.kernel.org, David Jeffery <djeffery@...hat.com>,
        Sasha Levin <alexander.levin@...rosoft.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4.4 014/190] lockd: fix lockd shutdown race

On Tue, May 15, 2018 at 07:44:24PM +0100, Ben Hutchings wrote:
> On Wed, 2018-04-11 at 20:34 +0200, Greg Kroah-Hartman wrote:
> > 4.4-stable review patch.  If anyone has any objections, please let me know.
> > 
> > ------------------
> > 
> > From: "J. Bruce Fields" <bfields@...hat.com>
> > 
> > 
> > [ Upstream commit efda760fe95ea15291853c8fa9235c32d319cd98 ]
> [...]
> > --- a/fs/lockd/svc.c
> > +++ b/fs/lockd/svc.c
> > @@ -129,6 +129,8 @@ lockd(void *vrqstp)
> >  {
> >  	int		err = 0;
> >  	struct svc_rqst *rqstp = vrqstp;
> > +	struct net *net = &init_net;
> > +	struct lockd_net *ln = net_generic(net, lockd_net_id);
> >  
> >  	/* try_to_freeze() is called from svc_recv() */
> >  	set_freezable();
> > @@ -173,6 +175,8 @@ lockd(void *vrqstp)
> >  	if (nlmsvc_ops)
> >  		nlmsvc_invalidate_all();
> > 	nlm_shutdown_hosts();
> > +	cancel_delayed_work_sync(&ln->grace_period_end);
> > +	locks_end_grace(&ln->lockd_manager);
> >  	return 0;
> >  }
> >  
> > @@ -267,8 +271,6 @@ static void lockd_down_net(struct svc_se
> >  	if (ln->nlmsvc_users) {
> >  		if (--ln->nlmsvc_users == 0) {
> >  			nlm_shutdown_hosts_net(net);
> > -			cancel_delayed_work_sync(&ln->grace_period_end);
> > -			locks_end_grace(&ln->lockd_manager);
> 
> Aren't these statements still needed for non-initial namespaces?

Looks like this this should be backported only if 3a2b19d1ee56 "lockd:
lost rollback of set_grace_period() in lockd_down_net()" is also.

--b.