--- old/test/lib/jdk/test/lib/process/OutputBuffer.java	2019-05-30 16:46:14.593646893 -0400
+++ new/test/lib/jdk/test/lib/process/OutputBuffer.java	2019-05-30 16:46:14.157623744 -0400
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -95,6 +95,7 @@
     private final void logProgress(String state) {
         System.out.println("[" + Instant.now().toString() + "] " + state
                            + " for process " + p.pid());
+        System.out.flush();
     }
 
     private LazyOutputBuffer(Process p) {