On Sat, Jun 03, 2017 at 02:42:43PM +0200, Frederic Weisbecker wrote:
> On Sat, Jun 03, 2017 at 08:06:41AM +0000, Levin, Alexander (Sasha Levin) wrote:
> > On Fri, Apr 21, 2017 at 04:00:55PM +0200, Frederic Weisbecker wrote:
> > > diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
> > > index 502b320..be7ca4d 100644
> > > --- a/kernel/time/tick-sched.c
> > > +++ b/kernel/time/tick-sched.c
> > > @@ -783,8 +783,13 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
> > > tick = expires;
> > >
> > > /* Skip reprogram of event if its not changed */
> > > - if (ts->tick_stopped && (expires == ts->next_tick))
> > > - goto out;
> > > + if (ts->tick_stopped && (expires == ts->next_tick)) {
> > > + /* Sanity check: make sure clockevent is actually programmed */
> > > + if (likely(dev->next_event <= ts->next_tick))
> > > + goto out;
> > > +
> > > + WARN_ON_ONCE(1);
> > > + }
> >
> > I seem to be hitting that in a KVM vm, even without load (sometimes
> > right after boot):
>
> Ah, can you tell me which tree you were using? Is it tip/master?
Its next-20170601: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?h=next-20170601&id=3ab334ebe84e0dfd1cc3ea2fe77f5ce4406f7370
> Can you give me its HEAD and your config file?
Attached config.
--
Thanks,
Sasha
Attachment:
config-sasha.gz
Description: config-sasha.gz