Messages in this thread | | | Date | Tue, 28 Mar 2006 03:55:30 +0400 | From | Oleg Nesterov <> | Subject | Re: [patch 2/2] hrtimer |
| |
I also think this is racy.
CPU_0 CPU_1
hrtimer_wakeup:
task = t->task; t->task = NULL;
<--- INTERRUPT --->
task is woken by signal, do_nanosleep() sees t->task == NULL, returns without hrtimer_cancel(), and __exits__.
<--- RESUME --->
wake_up_process(task);
Instead of exit(), 'task' can go to TASK_STOPPED or TASK_UNINTERRUPTIBLE after return from do_nanosleep(), it will be awakened by hrtimer_wakeup() unexpectedly.
Oleg.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |