1 /* 2 * Copyright (c) 2018, Red Hat, Inc. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 /** 26 * @test TestClassLoaderLeak 27 * @summary Test OOME in due to classloader leak 28 * @key gc 29 * @requires vm.gc.Shenandoah & !vm.graal.enabled 30 * @library /test/lib 31 * @run main 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 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(pbArgs.toArray(new String[0])); 104 105 OutputAnalyzer analyzer = new OutputAnalyzer(pb.start()); 106 107 if (shouldPass) { 108 analyzer.shouldHaveExitValue(0); 109 analyzer.shouldNotContain("java.lang.OutOfMemoryError"); 110 analyzer.shouldContain("All good"); 111 } else { 112 analyzer.shouldHaveExitValue(1); 113 analyzer.shouldContain("java.lang.OutOfMemoryError"); 114 analyzer.shouldNotContain("All good"); 115 } 116 } 117 118 public static void main(String[] args) throws Exception { 119 if (args.length > 0) { 120 String classDir = TestClassLoaderLeak.class.getProtectionDomain().getCodeSource().getLocation().getPath(); 121 for (int c = 0; c < COUNT; c++) { 122 load(classDir); 123 } 124 System.out.println("All good"); 125 return; 126 } 127 128 String[][][] modeHeuristics = new String[][][] { 129 {{"normal"}, {"adaptive", "compact", "static", "aggressive"}}, 130 {{"passive"}, {"passive"}} 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 passWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloading", "-XX:-ClassUnloadingWithConcurrentMark", "-XX:ShenandoahUnloadClassesFrequency=0"); 144 passWith("-XX:ShenandoahGCMode=" + mode, "-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:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:-ClassUnloading"); 148 failWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:-ClassUnloading", "-XX:+ClassUnloadingWithConcurrentMark"); 149 failWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:-ClassUnloading", "-XX:+ClassUnloadingWithConcurrentMark", "-XX:ShenandoahUnloadClassesFrequency=1"); 150 failWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:-ClassUnloading", "-XX:-ClassUnloadingWithConcurrentMark", "-XX:ShenandoahUnloadClassesFrequency=1"); 151 } 152 } 153 } 154 }