Index: if_ethersubr.c
===================================================================
RCS file: /cvs/src/sys/net/if_ethersubr.c,v
retrieving revision 1.238
diff -u -p -r1.238 if_ethersubr.c
--- if_ethersubr.c	8 Jun 2016 12:57:58 -0000	1.238
+++ if_ethersubr.c	11 Jul 2016 05:13:56 -0000
@@ -376,13 +376,17 @@ decapsulate:
 	case ETHERTYPE_ARP:
 		if (ifp->if_flags & IFF_NOARP)
 			goto dropanyway;
+		KERNEL_LOCK();
 		arpinput(ifp, m);
+		KERNEL_UNLOCK();
 		return (1);
 
 	case ETHERTYPE_REVARP:
 		if (ifp->if_flags & IFF_NOARP)
 			goto dropanyway;
+		KERNEL_LOCK();
 		revarpinput(ifp, m);
+		KERNEL_UNLOCK();
 		return (1);
 
 #ifdef INET6