Index: if_veb.c
===================================================================
RCS file: /cvs/src/sys/net/if_veb.c,v
retrieving revision 1.20
diff -u -p -r1.20 if_veb.c
--- if_veb.c	7 Jul 2021 20:19:01 -0000	1.20
+++ if_veb.c	24 Oct 2021 05:17:19 -0000
@@ -489,12 +489,17 @@ veb_rule_filter(struct veb_port *p, int 
     uint64_t src, uint64_t dst)
 {
 	struct veb_rule *vr;
+	int filter;
 
 	vr = SMR_TAILQ_FIRST(&p->p_vr_list[dir]);
 	if (vr == NULL)
 		return (0);
 
-	return (veb_rule_list_test(vr, dir, m, src, dst) == VEB_R_BLOCK);
+	smr_read_enter();
+	filter = veb_rule_list_test(vr, dir, m, src, dst);
+	smr_read_leave();
+
+	return (filter == VEB_R_BLOCK);
 }
 
 #if NPF > 0