linux-kernel - Re: [PATCH RFC] sched: Revert delayed_put_task

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Message-ID: <20141016075950.GC7369@worktop.fdxtended.com>
Date:	Thu, 16 Oct 2014 09:59:50 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Kirill Tkhai <tkhai@...dex.ru>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Kirill Tkhai <ktkhai@...allels.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Vladimir Davydov <vdavydov@...allels.com>
Subject: Re: [PATCH RFC] sched: Revert delayed_put_task_struct() and fix use
 after free

On Thu, Oct 16, 2014 at 01:46:07AM +0400, Kirill Tkhai wrote:
> > --- x/kernel/sched/fair.c
> > +++ x/kernel/sched/fair.c
> > @@ -1165,7 +1165,7 @@ static void task_numa_compare(struct tas
> >  
> >  	rcu_read_lock();
> >  	cur = ACCESS_ONCE(dst_rq->curr);
> > -	if (cur->pid == 0) /* idle */
> > +	if (is_idle_task(cur) || (curr->flags & PF_EXITING))
> >  		cur = NULL;
> >  
> >  	/*
> > 
> 
> Looks like, we have to use the same fix for task_numa_group().

Don't think so, task_numa_group() is only called from task_numa_fault()
which is on 'current' and neither idle and PF_EXITING should be
faulting.
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