Re: Experiencing freezes with kernel 4.16.3 on a desktop with E5500 CPU (bisect included)

From: Peter Zijlstra
Date: Mon Apr 23 2018 - 11:11:01 EST


On Mon, Apr 23, 2018 at 04:00:52PM +0200, Peter Zijlstra wrote:
> On Mon, Apr 23, 2018 at 02:38:47PM +0200, Peter Zijlstra wrote:
> > @@ -834,8 +857,12 @@ static int clocksource_unbind(struct clocksource *cs)
> > if (curr_clocksource == cs)
> > return -EBUSY;
> > }
> > +
> > + clocksource_watchdog_lock(&flags);
> > clocksource_dequeue_watchdog(cs);
> > list_del_init(&cs->list);
> > + clocksource_watchdog_lock(&flags);
>
> It works a lot better when this is _unlock();
>
> > +
> > return 0;
> > }
> >
>
> With that, and intel_idle.c modified to always issue the "halts in
> idle" thing, my IVB comes up in hpet mode. Let me dig up a Core2 era
> machine and see if that works too.

OK, that was fairly painful, but the box managed to boot a modified
kernel and seems to function correctly, lemme try suspend/resume.