1 /*
2 * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
3 * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 /**
27 * @test
28 * @summary Test OOME in due to classloader leak
29 * @requires vm.gc.Shenandoah
30 * @library /test/lib
31 * @run driver TestClassLoaderLeak
32 */
33
34 import java.util.*;
35 import java.io.*;
36 import java.nio.*;
37 import java.nio.file.*;
38
39 import jdk.test.lib.process.OutputAnalyzer;
40 import jdk.test.lib.process.ProcessTools;
41
42 public class TestClassLoaderLeak {
43
44 static final int SIZE = 1 * 1024 * 1024;
45 static final int COUNT = 128;
46
47 static volatile Object sink;
48
49 static class Dummy {
50 static final int[] PAYLOAD = new int[SIZE];
51 }
52
53 static class MyClassLoader extends ClassLoader {
54 final String path;
55
56 MyClassLoader(String path) {
57 this.path = path;
58 }
59
60 public Class<?> loadClass(String name) throws ClassNotFoundException {
61 try {
62 File f = new File(path, name + ".class");
63 if (!f.exists()) {
64 return super.loadClass(name);
65 }
66
67 Path path = Paths.get(f.getAbsolutePath());
68 byte[] cls = Files.readAllBytes(path);
69 return defineClass(name, cls, 0, cls.length, null);
70 } catch (IOException e) {
71 throw new ClassNotFoundException(name);
72 }
73 }
74 }
75
76 static void load(String path) throws Exception {
77 ClassLoader cl = new MyClassLoader(path);
78 Class<Dummy> c = (Class<Dummy>) Class.forName("TestClassLoaderLeak$Dummy", true, cl);
79 if (c.getClassLoader() != cl) {
80 throw new IllegalStateException("Should have loaded by target loader");
81 }
82 sink = c;
83 }
84
85 public static void passWith(String... args) throws Exception {
86 testWith(true, args);
87 }
88
89 public static void failWith(String... args) throws Exception {
90 testWith(false, args);
91 }
92
93 public static void testWith(boolean shouldPass, String... args) throws Exception {
94 List<String> pbArgs = new ArrayList<>();
95 pbArgs.add("-Xmx128m");
96 pbArgs.add("-XX:+UnlockExperimentalVMOptions");
97 pbArgs.add("-XX:+UnlockDiagnosticVMOptions");
98 pbArgs.add("-XX:+UseShenandoahGC");
99 pbArgs.addAll(Arrays.asList(args));
100 pbArgs.add(TestClassLoaderLeak.class.getName());
101 pbArgs.add("test");
102
103 OutputAnalyzer analyzer = ProcessTools.executeLimitedTestJava(pbArgs.toArray(new String[0]));
104
105 if (shouldPass) {
106 analyzer.shouldHaveExitValue(0);
107 analyzer.shouldNotContain("java.lang.OutOfMemoryError");
108 analyzer.shouldContain("All good");
109 } else {
110 analyzer.shouldHaveExitValue(1);
111 analyzer.shouldContain("java.lang.OutOfMemoryError");
112 analyzer.shouldNotContain("All good");
113 }
114 }
115
116 public static void main(String[] args) throws Exception {
117 if (args.length > 0) {
118 String classDir = TestClassLoaderLeak.class.getProtectionDomain().getCodeSource().getLocation().getPath();
119 for (int c = 0; c < COUNT; c++) {
120 load(classDir);
121 }
122 System.out.println("All good");
123 return;
124 }
125
126 String[][][] modeHeuristics = new String[][][] {
127 {{"satb"}, {"adaptive", "compact", "static", "aggressive"}},
128 {{"iu"}, {"adaptive", "aggressive"}},
129 {{"passive"}, {"passive"}},
130 {{"generational"}, {"adaptive"}}
131 };
132
133 for (String[][] mh : modeHeuristics) {
134 String mode = mh[0][0];
135 String[] heuristics = mh[1];
136 for (String h : heuristics) {
137 // Forceful enabling should work
138 passWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloading");
139 passWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloadingWithConcurrentMark");
140
141 // Even when concurrent unloading is disabled, Full GC has to recover
142 passWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloading", "-XX:-ClassUnloadingWithConcurrentMark");
143
144 // Should OOME when unloading forcefully disabled, even if local flags try to enable it back
145 failWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:-ClassUnloading");
146 failWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:-ClassUnloading", "-XX:+ClassUnloadingWithConcurrentMark");
147 }
148 }
149 }
150 }