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 & !vm.graal.enabled 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 MyClassLoader(String path)55 MyClassLoader(String path) { 56 this.path = path; 57 } 58 loadClass(String name)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 load(String path)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 passWith(String... args)84 public static void passWith(String... args) throws Exception { 85 testWith(true, args); 86 } 87 failWith(String... args)88 public static void failWith(String... args) throws Exception { 89 testWith(false, args); 90 } 91 testWith(boolean shouldPass, String... args)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 main(String[] args)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[][][] modeHeuristics = new String[][][] { 128 {{"satb"}, {"adaptive", "compact", "static", "aggressive"}}, 129 {{"iu"}, {"adaptive", "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 } 155