1 /*
2 * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24 /**
25 * @test TestClassLoaderLeak
26 * @summary Test OOME in due to classloader leak
27 * @key gc
28 * @requires vm.gc.Shenandoah
29 * @library /test/lib
30 * @run main TestClassLoaderLeak
31 */
32
33 import java.util.*;
34 import java.io.*;
35 import java.nio.*;
36 import java.nio.file.*;
37
38 import jdk.test.lib.process.OutputAnalyzer;
39 import jdk.test.lib.process.ProcessTools;
40
41 public class TestClassLoaderLeak {
42
43 static final int SIZE = 1 * 1024 * 1024;
44 static final int COUNT = 128;
45
46 static volatile Object sink;
47
48 static class Dummy {
49 static final int[] PAYLOAD = new int[SIZE];
50 }
51
52 static class MyClassLoader extends ClassLoader {
53 final String path;
54
55 MyClassLoader(String path) {
56 this.path = path;
57 }
58
59 public Class<?> loadClass(String name) throws ClassNotFoundException {
60 try {
61 File f = new File(path, name + ".class");
62 if (!f.exists()) {
63 return super.loadClass(name);
64 }
65
66 Path path = Paths.get(f.getAbsolutePath());
67 byte[] cls = Files.readAllBytes(path);
68 return defineClass(name, cls, 0, cls.length, null);
69 } catch (IOException e) {
70 throw new ClassNotFoundException(name);
71 }
72 }
73 }
74
75 static void load(String path) throws Exception {
76 ClassLoader cl = new MyClassLoader(path);
77 Class<Dummy> c = (Class<Dummy>) Class.forName("TestClassLoaderLeak$Dummy", true, cl);
78 if (c.getClassLoader() != cl) {
79 throw new IllegalStateException("Should have loaded by target loader");
80 }
81 sink = c;
82 }
83
84 public static void passWith(String... args) throws Exception {
85 testWith(true, args);
86 }
87
88 public static void failWith(String... args) throws Exception {
89 testWith(false, args);
90 }
91
92 public static void testWith(boolean shouldPass, String... args) throws Exception {
93 List<String> pbArgs = new ArrayList<>();
94 pbArgs.add("-Xmx128m");
95 pbArgs.add("-XX:+UnlockExperimentalVMOptions");
96 pbArgs.add("-XX:+UnlockDiagnosticVMOptions");
97 pbArgs.add("-XX:+UseShenandoahGC");
98 pbArgs.addAll(Arrays.asList(args));
99 pbArgs.add(TestClassLoaderLeak.class.getName());
100 pbArgs.add("test");
101
102 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(pbArgs.toArray(new String[0]));
103
104 OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());
105
106 if (shouldPass) {
107 analyzer.shouldHaveExitValue(0);
108 analyzer.shouldNotContain("java.lang.OutOfMemoryError");
109 analyzer.shouldContain("All good");
110 } else {
111 analyzer.shouldHaveExitValue(1);
112 analyzer.shouldContain("java.lang.OutOfMemoryError");
113 analyzer.shouldNotContain("All good");
114 }
115 }
116
117 public static void main(String[] args) throws Exception {
118 if (args.length > 0) {
119 String classDir = TestClassLoaderLeak.class.getProtectionDomain().getCodeSource().getLocation().getPath();
120 for (int c = 0; c < COUNT; c++) {
121 load(classDir);
122 }
123 System.out.println("All good");
124 return;
125 }
126
127 String[] heuristics = new String[] {
128 "adaptive",
129 "compact",
130 "static",
131 "traversal",
132 "aggressive",
133 "passive",
134 };
135
136 for (String h : heuristics) {
137 // Forceful enabling should work
138 passWith("-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloading");
139 passWith("-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloadingWithConcurrentMark");
140
141 // Even when concurrent unloading is disabled, Full GC has to recover
142 passWith("-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloading", "-XX:-ClassUnloadingWithConcurrentMark");
143 passWith("-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloading", "-XX:-ClassUnloadingWithConcurrentMark", "-XX:ShenandoahUnloadClassesFrequency=0");
144 passWith("-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloading", "-XX:+ClassUnloadingWithConcurrentMark", "-XX:ShenandoahUnloadClassesFrequency=0");
145
146 // Should OOME when unloading forcefully disabled, even if local flags try to enable it back
147 failWith("-XX:ShenandoahGCHeuristics=" + h, "-XX:-ClassUnloading");
148 failWith("-XX:ShenandoahGCHeuristics=" + h, "-XX:-ClassUnloading", "-XX:+ClassUnloadingWithConcurrentMark");
149 failWith("-XX:ShenandoahGCHeuristics=" + h, "-XX:-ClassUnloading", "-XX:+ClassUnloadingWithConcurrentMark", "-XX:ShenandoahUnloadClassesFrequency=1");
150 failWith("-XX:ShenandoahGCHeuristics=" + h, "-XX:-ClassUnloading", "-XX:-ClassUnloadingWithConcurrentMark", "-XX:ShenandoahUnloadClassesFrequency=1");
151 }
152 }
153 }