run(vconn_open_block(argv[1], &vconn), "connecting to %s", argv[1]);
run(vconn_transact(vconn, request, &reply), "talking to %s", argv[1]);
if (reply->size != request->size) {
run(vconn_open_block(argv[1], &vconn), "connecting to %s", argv[1]);
run(vconn_transact(vconn, request, &reply), "talking to %s", argv[1]);
if (reply->size != request->size) {