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SubjectRe: [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.

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