linux-kernel - Re: kernel deadlock

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Date:	Sat, 31 Aug 2013 10:11:24 +0200
From:	Gerlando Falauto <gerlando.falauto@...mile.com>
To:	Stephen Boyd <sboyd@...eaurora.org>
CC:	John Stultz <john.stultz@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Richard Cochran <richardcochran@...il.com>,
	Prarit Bhargava <prarit@...hat.com>,
	"Brunck, Holger" <Holger.Brunck@...mile.com>,
	"Longchamp, Valentin" <Valentin.Longchamp@...mile.com>,
	"Bigler, Stefan" <Stefan.Bigler@...mile.com>
Subject: Re: kernel deadlock

Hi Stephen,
 >
> Just curious. Do you have this patch from 3.11 applied to your 3.10
> kernel tree?

Nope, I didn't. But I applied it, and it doesn't seem to make a 
difference, unfortunately. :-(

Thanks for your help anyway!
Gerlando

>
> commit 971ee28cbd1ccd87b3164facd9359a534c1d2892
> Author: Peter Zijlstra <peterz@...radead.org>
> Date:   Fri Jun 28 11:18:53 2013 +0200
>
>      sched: Fix HRTICK
>
>      David reported that the HRTICK sched feature was borken; which was
> enough
>      motivation for me to finally fix it ;-)
>
>      We should not allow hrtimer code to do softirq wakeups while holding
> schedul
> er
>      locks. The hrtimer code only needs this when we accidentally try to
> program
> an
>      expired time. We don't much care about those anyway since we have
> the regula
> r
>      tick to fall back to.
>
>      Reported-by: David Ahern <dsahern@...il.com>
>      Tested-by: David Ahern <dsahern@...il.com>
>      Signed-off-by: Peter Zijlstra <peterz@...radead.org>
>      Link:
> http://lkml.kernel.org/r/20130628091853.GE29209@dyad.programming.kicks
> -ass.net
>      Signed-off-by: Ingo Molnar <mingo@...nel.org>
>

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