linux-kernel - Re: [Regression] 2.6.24-git9: RT sched mishandles artswrapper (bisected)

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Date:	Fri, 01 Feb 2008 08:44:56 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Regression] 2.6.24-git9: RT sched mishandles artswrapper
	(bisected)


On Fri, 2008-02-01 at 03:04 +0100, Rafael J. Wysocki wrote:
> On Friday, 1 of February 2008, Rafael J. Wysocki wrote:
> > Hi,
> > 
> > This is related to the problem I reported earlier this week:
> > http://lkml.org/lkml/2008/1/30/554
> > 
> > Apparently artswrapper, run by KDE in openSUSE 10.3 with a real time priority,
> > is mishandled by the scheduler.  The problem is that after the user logs out,
> > artswrapper stays in TASK_RUNNING forever and prevents other tasks from being
> > scheduled on the CPU occupied by it.  In this state it also breaks suspend and
> > hibernation (it cannot be frozen).
> > 
> > Since the problem is 100% reproducible on my test boxes, I carried out a
> > bisection which turned out the following commit:
> > 
> > commit 6f505b16425a51270058e4a93441fe64de3dd435
> > Author: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > Date:   Fri Jan 25 21:08:30 2008 +0100
> > 
> >     sched: rt group scheduling
> > 
> > I'm now checking if the problem disappears after reverting this patch (along a
> > couple of dependent ones).
> 
> Yes, it does.
> 
> Please let me know what I can do to debug it further.

It arts run as root, or does it use RLIMIT_RTPRIO to allow users to
execute realtime tasks?



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