linux-kernel - Re: [BUG: NULL pointer dereference] cgroups and RT scheduling interact badly.

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Date:	Mon, 16 Jun 2008 15:51:52 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Daniel K." <dk@...no>
Cc:	mingo@...e.hu, menage@...gle.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [BUG: NULL pointer dereference] cgroups and RT
	scheduling	interact badly.

On Mon, 2008-06-16 at 15:14 +0200, Daniel K. wrote:
> Peter Zijlstra wrote:
> > Does the below work for you?
> > 
> > Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > ---
> > Index: linux-2.6/kernel/sched.c
> > ===================================================================
> > --- linux-2.6.orig/kernel/sched.c
> > +++ linux-2.6/kernel/sched.c
> > @@ -7784,7 +7784,6 @@ static void init_tg_rt_entry(struct task
> >  	else
> >  		rt_se->rt_rq = parent->my_q;
> >  
> > -	rt_se->rt_rq = &rq->rt;
> >  	rt_se->my_q = rt_rq;
> >  	rt_se->parent = parent;
> >  	INIT_LIST_HEAD(&rt_se->run_list);
> 
> Although this patch seems to be correct, this is what shows up on my
> netconsole, when applying it -- with an offset, do you have other fixes
> applied as well?

I had indeed, although nothing touching the rt scheduler. I popped all
my patches and pulled an update from Linus, but I fail to reproduce the
below.

/me goes look for that burnp6 thing, I used a simple while (1); loop.


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