diff -Nupr src.orig/net/core/dev.c src/net/core/dev.c
--- src.orig/net/core/dev.c	2017-09-22 15:27:21.759056428 -0400
+++ src/net/core/dev.c	2017-09-22 15:27:25.244070859 -0400
@@ -4012,6 +4012,7 @@ ncls:
 		case RX_HANDLER_PASS:
 			break;
 		default:
+			printk("BUG!\n");
 			BUG();
 		}
 	}