Index: if_tun.c
===================================================================
RCS file: /cvs/src/sys/net/if_tun.c,v
retrieving revision 1.230
diff -u -p -r1.230 if_tun.c
--- if_tun.c	20 Feb 2021 04:39:16 -0000	1.230
+++ if_tun.c	5 Mar 2021 22:21:54 -0000
@@ -831,6 +814,7 @@ tun_dev_write(dev_t dev, struct uio *uio
 	struct mbuf		*m0;
 	int			error = 0;
 	size_t			mlen;
+	struct mbuf_list	ml = MBUF_LIST_INITIALIZER();
 
 	sc = tun_get(dev);
 	if (sc == NULL)
@@ -868,9 +852,8 @@ tun_dev_write(dev_t dev, struct uio *uio
 	if (error != 0)
 		goto drop;
 
-	NET_LOCK();
-	if_vinput(ifp, m0);
-	NET_UNLOCK();
+	ml_enqueue(&ml, m0);
+	if_input(ifp, &ml);
 
 	tun_put(sc);
 	return (0);