Index: head/sys/kern/kern_event.c
===================================================================
--- head/sys/kern/kern_event.c
+++ head/sys/kern/kern_event.c
@@ -535,8 +535,9 @@
 
 	if (list == NULL)
 		return;
-	list->kl_lock(list->kl_lockarg);
 
+	memset(&kev, 0, sizeof(kev));
+	list->kl_lock(list->kl_lockarg);
 	SLIST_FOREACH(kn, &list->kl_list, kn_selnext) {
 		kq = kn->kn_kq;
 		KQ_LOCK(kq);
Index: head/sys/kern/vfs_aio.c
===================================================================
--- head/sys/kern/vfs_aio.c
+++ head/sys/kern/vfs_aio.c
@@ -1589,6 +1589,7 @@
 		goto aqueue_fail;
 	}
 	kqfd = job->uaiocb.aio_sigevent.sigev_notify_kqueue;
+	memset(&kev, 0, sizeof(kev));
 	kev.ident = (uintptr_t)job->ujob;
 	kev.filter = EVFILT_AIO;
 	kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1 | evflags;
@@ -2155,6 +2156,7 @@
 		bcopy(sig, &lj->lioj_signal, sizeof(lj->lioj_signal));
 		if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
 			/* Assume only new style KEVENT */
+			memset(&kev, 0, sizeof(kev));
 			kev.filter = EVFILT_LIO;
 			kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1;
 			kev.ident = (uintptr_t)uacb_list; /* something unique */