linux-kernel - Re: Hang in work

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Message-Id: <1201779146.28547.294.camel@lappy>
Date:	Thu, 31 Jan 2008 12:32:26 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Guillaume Chazarain <guichaz@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: Hang in work_resched


On Thu, 2008-01-31 at 12:29 +0100, Guillaume Chazarain wrote:
> On Jan 31, 2008 9:55 AM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> > Does this patch from thomas fix it as well?
> 
> Unfortunately, not.
> 
> For information, reverting just the first part of the offending commit
> (sl->timer.cb_mode) fixed the problem, while reverting only the second
> part (if (!hrtimer_active(&t->timer))) had no effect.
> 
> Also, I found a trivially reproductible testcase : sleep 0.
> 
> It hangs in nanosleep({0, 0}).

Thanks, I'll go look.

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