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?
Can you give me its HEAD and your config file?
Thanks