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

From: Greg Kroah-Hartman
Date: Thu May 17 2018 - 04:54:04 EST


On Wed, May 16, 2018 at 03:53:29PM -0400, J. Bruce Fields wrote:
> 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@xxxxxxxxxx>
> > >
> > >
> > > [ 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.

Looks like it, thanks, now queued up.

greg k-h