2.6.37-stable review patch. If anyone has any objections, please let us know.
------------------ From: Peter Zijlstra <[email protected]> commit 06c3bc655697b19521901f9254eb0bbb2c67e7e8 upstream. cpu_stopper_thread() migration_cpu_stop() __migrate_task() deactivate_task() dequeue_task() dequeue_task_rq() update_curr_rt() Will call update_curr_rt() on rq->curr, which at that time is rq->stop. The problem is that rq->stop.prio matches an RT prio and thus falsely assumes its a rt_sched_class task. Reported-Debuged-Tested-Acked-by: Thomas Gleixner <[email protected]> Signed-off-by: Peter Zijlstra <[email protected]> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- kernel/sched_rt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/kernel/sched_rt.c +++ b/kernel/sched_rt.c @@ -606,7 +606,7 @@ static void update_curr_rt(struct rq *rq struct rt_rq *rt_rq = rt_rq_of_se(rt_se); u64 delta_exec; - if (!task_has_rt_policy(curr)) + if (curr->sched_class != &rt_sched_class) return; delta_exec = rq->clock_task - curr->se.exec_start; _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
