client: disable tokio lifo slot optimization

src/bin/mgen-client.rs

@@ -526,6 +526,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     tokio::runtime::Builder::new_multi_thread()
         .worker_threads(2)
         .enable_all()
+        .disable_lifo_slot()
         .build()
         .unwrap()
         .block_on(main_worker())