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

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Message-ID: <20180423151035.GP4129@hirez.programming.kicks-ass.net>
Date:   Mon, 23 Apr 2018 17:10:35 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Diego Viola <diego.viola@...il.com>
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de,
        len.brown@...el.com, rui.zhang@...el.com,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: Experiencing freezes with kernel 4.16.3 on a desktop with E5500
 CPU (bisect included)

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.