25.08.2014, 20:01, "Oleg Nesterov" <[email protected]>:
> Peter, do you remember another problem with TASK_DEAD we discussed recently?
> (prev_state == TASK_DEAD detection in finish_task_switch() still looks racy).
One more problem with task_dead just to mention it here.
Below is racy with the change of sched_class:
if (prev->sched_class->task_dead)
prev->sched_class->task_dead(prev);
switched_from_dl() does not cancel running timers.
So, if dl_task_timer() is slow (it is unhappy with rq->lock acquiring),
the timer is executing when tasks is already dead.
Kirill
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