On Tue, 2006-03-28 at 03:55 +0400, Oleg Nesterov wrote:
> 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.
Yep, you are right.
Index: linux-2.6.16/kernel/hrtimer.c
===================================================================
--- linux-2.6.16.orig/kernel/hrtimer.c
+++ linux-2.6.16/kernel/hrtimer.c
@@ -684,10 +684,9 @@ static int __sched do_nanosleep(struct h
schedule();
- if (unlikely(t->task)) {
- hrtimer_cancel(&t->timer);
- mode = HRTIMER_ABS;
- }
+ hrtimer_cancel(&t->timer);
+ mode = HRTIMER_ABS;
+
} while (t->task && !signal_pending(current));
return t->task == NULL;
-
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