On 07/30, Paul E. McKenney wrote:
>
> + rcu_read_lock();
> + for_each_process_thread(g, t) {
> + if (t != current && ACCESS_ONCE(t->on_rq) &&
> + !is_idle_task(t)) {
> + t->rcu_tasks_nvcsw = ACCESS_ONCE(t->nvcsw);
> + t->rcu_tasks_holdout = 1;
> + list_add(&t->rcu_tasks_holdout_list,
> + &rcu_tasks_holdouts);
> + }
> + }
> + rcu_read_unlock();
Wait, unless I missed something this can't work...
The problem is, once the exiting task passes exit_notify() it can
be removed from rcu lists.
Now suppose that (say) proc_exit_connector() has a probe, and this
task has jumped into trampoline and it was preempted there.
No?
Oleg.
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