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

[Peter Zijlstra]

On Wed, Oct 15, 2014 at 05:06:41PM +0200, Oleg Nesterov wrote:
> 
> At least the code like
> 
> 	rcu_read_lock();
> 	get_task_struct(foreign_rq->curr);
> 	rcu_read_unlock();
> 
> is certainly wrong. And _probably_ the problem should be fixed here. Perhaps
> we can add try_to_get_task_struct() which does atomic_inc_not_zero() ...

There is an rcu_read_lock() around it through task_numa_compare().
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