linux-kernel - Re: Hang in work

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Message-ID: <3d8471ca0801310329o5620ac39qe3a0c39f2c0baa49@mail.gmail.com>
Date:	Thu, 31 Jan 2008 12:29:36 +0100
From:	"Guillaume Chazarain" <guichaz@...il.com>
To:	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>
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 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}).

-- 
Guillaume
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