linux-kernel - Re: [BUG 2.6.25-rc3] scheduler/hotplug: some processes are dealocked when cpu is set to offline

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Date:	Sat, 8 Mar 2008 00:43:15 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	dmitry.adamushko@...il.com, ego@...ibm.com, mingo@...e.hu,
	oleg@...sign.ru, yi.y.yang@...el.com, linux-kernel@...r.kernel.org,
	tglx@...utronix.de
Subject: Re: [BUG 2.6.25-rc3] scheduler/hotplug: some processes are dealocked when cpu is set to offline

On Saturday, 8 of March 2008, Andrew Morton wrote:
> On Fri, 7 Mar 2008 15:01:26 -0800
> Suresh Siddha <suresh.b.siddha@...el.com> wrote:
> 
> > 
> > Andrew, Please check if the appended patch fixes your power-off problem aswell.
> > ...
> >
> > --- a/kernel/sched.c
> > +++ b/kernel/sched.c
> > @@ -5882,6 +5882,7 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
> >  		break;
> >  
> >  	case CPU_DOWN_PREPARE:
> > +	case CPU_DOWN_PREPARE_FROZEN:
> >  		/* Update our root-domain */
> >  		rq = cpu_rq(cpu);
> >  		spin_lock_irqsave(&rq->lock, flags);
> 
> No, it does not.

Well, this is a bug nevertheless.

In fact, the frozen bit should only be set during hibernation/suspend and not
during shutdown ...

So, it looks like disable_nonboot_cpus() needs an extra parameter.
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