Index: net/if_tun.c
===================================================================
RCS file: /cvs/src/sys/net/if_tun.c,v
retrieving revision 1.184
diff -u -p -r1.184 if_tun.c
--- net/if_tun.c	3 Feb 2019 23:04:49 -0000	1.184
+++ net/if_tun.c	29 Apr 2019 07:14:46 -0000
@@ -576,7 +576,6 @@ tun_output(struct ifnet *ifp, struct mbu
 		return (error);
 	}
 
-	tun_wakeup(tp);
 	return (0);
 }
 
Index: kern/kern_event.c
===================================================================
RCS file: /cvs/src/sys/kern/kern_event.c,v
retrieving revision 1.101
diff -u -p -r1.101 kern_event.c
--- kern/kern_event.c	27 Nov 2018 15:52:50 -0000	1.101
+++ kern/kern_event.c	29 Apr 2019 07:14:46 -0000
@@ -1072,6 +1072,7 @@ knote_enqueue(struct knote *kn)
 	struct kqueue *kq = kn->kn_kq;
 	int s = splhigh();
 
+	KERNEL_ASSERT_LOCKED();
 	KASSERT((kn->kn_status & KN_QUEUED) == 0);
 
 	TAILQ_INSERT_TAIL(&kq->kq_head, kn, kn_tqe);
@@ -1089,6 +1090,7 @@ knote_dequeue(struct knote *kn)
 
 	KASSERT(kn->kn_status & KN_QUEUED);
 
+	KERNEL_ASSERT_LOCKED();
 	TAILQ_REMOVE(&kq->kq_head, kn, kn_tqe);
 	kn->kn_status &= ~KN_QUEUED;
 	kq->kq_count--;