--- ./sys/net/if_fddisubr.c.DIST	2017-02-13 19:05:06.000000000 -0800
+++ ./sys/net/if_fddisubr.c	2024-02-10 20:21:28.176187358 -0800
@@ -626,6 +626,8 @@
 #ifdef IFF_NOTRAILERS
 	ifp->if_flags |= IFF_NOTRAILERS;
 #endif
+	/* XXX: ec->ec_lock uninitialized in NetBSD-8! */
+	ec->ec_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NET);
 
 	/*
 	 * Update the max_linkhdr