D13845.diff
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	Index: sys/cam/cam_periph.c
	===================================================================
	--- sys/cam/cam_periph.c
	+++ sys/cam/cam_periph.c
	@@ -1187,10 +1187,16 @@
	* scheduler is running in this case, we still need to poll the I/O to
	* avoid sleeping waiting for the ccb to complete.
	*
	- * XXX To avoid locking problems, dumping/polling callers must call
	+ * A panic triggered dump stops the scheduler, any callback from the
	+ * shutdown_post_sync event will run with the scheduler stopped, but
	+ * before we're officially dumping. To avoid hanging in adashutdown
	+ * initiated commands (or other similar situations), we have to test for
	+ * either SCHEDULER_STOPPED() here as well.
	+ *
	+ * To avoid locking problems, dumping/polling callers must call
	* without a periph lock held.
	*/
	- must_poll = dumping;
	+ must_poll = dumping \|\| SCHEDULER_STOPPED();
	ccb->ccb_h.cbfcnp = cam_periph_done;

	/*