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8284874: Add comment to ProcessHandle/OnExitTest to describe zombie problem

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Reviewed-by: rriggs
This commit is contained in:
Thomas Stuefe 2022-04-15 09:08:18 +00:00
parent 1e22c70ff2
commit bb7c97bddf
1 changed files with 19 additions and 1 deletions
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20
test/jdk/java/lang/ProcessHandle/OnExitTest.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2014, 2022, 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 +95,24 @@ public class OnExitTest extends ProcessUtil {
*/
@Test
public static void test2() {
// Please note (JDK-8284282):
//
// On Unix, this test relies on the ability of the system to adopt orphaned processes and
// reap them in a timely fashion. In other words, the ability to prevent orphans from becoming
// zombies.
//
// Therefore, on misconfigured or broken systems, this test may fail. These failures will manifest
// as timeouts. The failures depend on timing: they may not happen at all, be intermittent or
// constant.
//
// That will rarely be a problem on bare-metal systems but may be more common when running in
// Docker. Misconfigured Docker instances may run with an initial process unable to reap. One
// infamous example would be running jtreg tests inside a Docker via Jenkins CI.
//
// This is quite difficult - and inefficient - to fix inside this test, and rather easy to
// avoid. For a detailed analysis, as well as proposed workarounds, please see JDK-8284282.
//
ProcessHandle procHandle = null;
try {
ConcurrentHashMap<ProcessHandle, ProcessHandle> processes = new ConcurrentHashMap<>();