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 * @library /testlibrary
29 *
30 * @run main/timeout=480 TestClassLoaderLeak
31 */
32
33 import java.util.*;
34 import java.io.*;
35 import java.nio.*;
36 import java.nio.file.*;
37 import com.oracle.java.testlibrary.*;
38
39 public class TestClassLoaderLeak {
40
41 static final int SIZE = 1 * 1024 * 1024;
42 static final int COUNT = 128;
43
44 static volatile Object sink;
45
46 static class Dummy {
47 static final int[] PAYLOAD = new int[SIZE];
48 }
49
50 static class MyClassLoader extends ClassLoader {
51 final String path;
52
53 MyClassLoader(String path) {
54 this.path = path;
55 }
56
57 public Class<?> loadClass(String name) throws ClassNotFoundException {
58 try {
59 File f = new File(path, name + ".class");
60 if (!f.exists()) {
61 return super.loadClass(name);
62 }
63
64 Path path = Paths.get(f.getAbsolutePath());
65 byte[] cls = Files.readAllBytes(path);
66 return defineClass(name, cls, 0, cls.length, null);
67 } catch (IOException e) {
68 throw new ClassNotFoundException(name);
69 }
70 }
71 }
72
73 static void load(String path) throws Exception {
74 ClassLoader cl = new MyClassLoader(path);
75 Class<Dummy> c = (Class<Dummy>) Class.forName("TestClassLoaderLeak$Dummy", true, cl);
76 if (c.getClassLoader() != cl) {
77 throw new IllegalStateException("Should have loaded by target loader");
78 }
79 sink = c;
80 }
81
82 public static void passWith(String... args) throws Exception {
83 testWith(true, args);
84 }
85
86 public static void failWith(String... args) throws Exception {
87 testWith(false, args);
88 }
89
90 public static void testWith(boolean shouldPass, String... args) throws Exception {
91 List<String> pbArgs = new ArrayList<>();
92 pbArgs.add("-Xmx128m");
93 pbArgs.add("-XX:+UnlockExperimentalVMOptions");
94 pbArgs.add("-XX:+UnlockDiagnosticVMOptions");
95 pbArgs.add("-XX:+UseShenandoahGC");
96 pbArgs.addAll(Arrays.asList(args));
97 pbArgs.add(TestClassLoaderLeak.class.getName());
98 pbArgs.add("test");
99
100 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(pbArgs.toArray(new String[0]));
101
102 OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());
103
104 if (shouldPass) {
105 analyzer.shouldHaveExitValue(0);
106 analyzer.shouldNotContain("java.lang.OutOfMemoryError");
107 analyzer.shouldContain("All good");
108 } else {
109 analyzer.shouldHaveExitValue(1);
110 analyzer.shouldContain("java.lang.OutOfMemoryError");
111 analyzer.shouldNotContain("All good");
112 }
113 }
114
115 public static void main(String[] args) throws Exception {
116 if (args.length > 0) {
117 String classDir = TestClassLoaderLeak.class.getProtectionDomain().getCodeSource().getLocation().getPath();
118 for (int c = 0; c < COUNT; c++) {
119 load(classDir);
120 }
121 System.out.println("All good");
122 return;
123 }
124
125 String[][][] modeHeuristics = new String[][][] {
126 {{"satb"}, {"adaptive", "compact", "static", "aggressive"}},
127 {{"iu"}, {"adaptive", "aggressive"}},
128 {{"passive"}, {"passive"}}
129 };
130
131 for (String[][] mh : modeHeuristics) {
132 String mode = mh[0][0];
133 String[] heuristics = mh[1];
134 for (String h : heuristics) {
135 // Forceful enabling should work
136 passWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloading");
137 passWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloadingWithConcurrentMark");
138
139 // Even when concurrent unloading is disabled, Full GC has to recover
140 passWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloading", "-XX:-ClassUnloadingWithConcurrentMark");
141 passWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloading", "-XX:-ClassUnloadingWithConcurrentMark", "-XX:ShenandoahUnloadClassesFrequency=0");
142 passWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloading", "-XX:+ClassUnloadingWithConcurrentMark", "-XX:ShenandoahUnloadClassesFrequency=0");
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 failWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:-ClassUnloading", "-XX:+ClassUnloadingWithConcurrentMark", "-XX:ShenandoahUnloadClassesFrequency=1");
148 failWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:-ClassUnloading", "-XX:-ClassUnloadingWithConcurrentMark", "-XX:ShenandoahUnloadClassesFrequency=1");
149 }
150 }
151 }
152 }