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 27 * @summary Test OOME in due to classloader leak 28 * @requires vm.gc.Shenandoah 29 * @library /test/lib 30 * @run driver 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 OutputAnalyzer analyzer = ProcessTools.executeLimitedTestJava(pbArgs.toArray(new String[0])); 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 {{"passive"}, {"passive"}} 128 }; 129 130 for (String[][] mh : modeHeuristics) { 131 String mode = mh[0][0]; 132 String[] heuristics = mh[1]; 133 for (String h : heuristics) { 134 // Forceful enabling should work 135 passWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloading"); 136 passWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloadingWithConcurrentMark"); 137 138 // Even when concurrent unloading is disabled, Full GC has to recover 139 passWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloading", "-XX:-ClassUnloadingWithConcurrentMark"); 140 141 // Should OOME when unloading forcefully disabled, even if local flags try to enable it back 142 failWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:-ClassUnloading"); 143 failWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:-ClassUnloading", "-XX:+ClassUnloadingWithConcurrentMark"); 144 } 145 } 146 } 147 }