--- sys/kern/kern_intr.c.orig	2013-06-16 09:41:42.000000000 -0400
+++ sys/kern/kern_intr.c	2013-06-16 09:41:35.000000000 -0400
@@ -1348,7 +1348,7 @@
 		 * we are running, it will set it_need to note that we
 		 * should make another pass.
 		 */
-		while (ithd->it_need) {
+		while (atomic_load_acq_int(&ithd->it_need)) {
 			/*
 			 * This might need a full read and write barrier
 			 * to make sure that this write posts before any