Re: [PATCH RFC] sched: Revert delayed_put_task_struct() and fix use after free

[Peter Zijlstra]

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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