Commit fa07fb6a authored Sep 05, 2016 by Tejun Heo

workqueue: dump workqueue state on sanity check failures in destroy_workqueue()



destroy_workqueue() performs a number of sanity checks to ensure that
the workqueue is empty before proceeding with destruction.  However,
it's not always easy to tell what's going on just from the warning
message.  Let's dump workqueue state after sanity check failures to
help debugging.

Signed-off-by: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/r/CACT4Y+Zs6vkjHo9qHb4TrEiz3S4+quvvVQ9VWvj2Mx6pETGb9Q@mail.gmail.com
Cc: Dmitry Vyukov <dvyukov@google.com>

parent 77e5bdf9

kernel/workqueue.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -4021,6 +4021,7 @@ void destroy_workqueue(struct workqueue_struct *wq)
		for (i = 0; i < WORK_NR_COLORS; i++) {
		if (WARN_ON(pwq->nr_in_flight[i])) {
		mutex_unlock(&wq->mutex);
		show_workqueue_state();
		return;
		}
		}
		@@ -4029,6 +4030,7 @@ void destroy_workqueue(struct workqueue_struct *wq)
		WARN_ON(pwq->nr_active) \|\|
		WARN_ON(!list_empty(&pwq->delayed_works))) {
		mutex_unlock(&wq->mutex);
		show_workqueue_state();
		return;
		}
		}