Subject: sched: Check for idle task in might_sleep() From: Thomas Gleixner Date: Wed, 09 Jan 2013 23:34:08 +0100 Idle is not allowed to call sleeping functions ever! Signed-off-by: Thomas Gleixner --- kernel/sched/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) Index: linux-stable/kernel/sched/core.c =================================================================== --- linux-stable.orig/kernel/sched/core.c +++ linux-stable/kernel/sched/core.c @@ -7783,7 +7783,8 @@ void __might_sleep(const char *file, int static unsigned long prev_jiffy; /* ratelimiting */ rcu_sleep_check(); /* WARN_ON_ONCE() by default, no rate limit reqd. */ - if ((preempt_count_equals(preempt_offset) && !irqs_disabled()) || + if ((preempt_count_equals(preempt_offset) && !irqs_disabled() && + !is_idle_task(current)) || system_state != SYSTEM_RUNNING || oops_in_progress) return; if (time_before(jiffies, prev_jiffy + HZ) && prev_jiffy)