1 /* 2 * Copyright (c) 2016, 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 TestEvilSyncBug 26 * @summary Tests for crash/assert when attaching init thread during shutdown 27 * @key gc 28 * @requires vm.gc.Shenandoah 29 * @library /test/lib 30 * @modules java.base/jdk.internal.misc 31 * java.management 32 * @run driver/timeout=480 TestEvilSyncBug 33 */ 34 35 import java.util.*; 36 import java.util.concurrent.*; 37 import java.util.concurrent.locks.*; 38 39 import jdk.test.lib.process.ProcessTools; 40 import jdk.test.lib.process.OutputAnalyzer; 41 42 public class TestEvilSyncBug { 43 44 private static final int NUM_RUNS = 100; 45 46 static Thread[] hooks = new MyHook[10000]; 47 48 public static void main(String[] args) throws Exception { 49 if (args.length > 0) { 50 test(); 51 } else { 52 ExecutorService pool = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors()); 53 54 Future<?>[] fs = new Future<?>[NUM_RUNS]; 55 56 for (int c = 0; c < NUM_RUNS; c++) { 57 Callable<Void> task = () -> { 58 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xms128m", 59 "-Xmx128m", 60 "-XX:+UnlockExperimentalVMOptions", 61 "-XX:+UnlockDiagnosticVMOptions", 62 "-XX:+UseShenandoahGC", 63 "-XX:ShenandoahGCHeuristics=aggressive", 64 "-XX:+ShenandoahStoreCheck", 65 "TestEvilSyncBug", "test"); 66 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 67 output.shouldHaveExitValue(0); 68 return null; 69 }; 70 fs[c] = pool.submit(task); 71 } 72 73 for (Future<?> f : fs) { 74 f.get(); 75 } 76 77 pool.shutdown(); 78 pool.awaitTermination(1, TimeUnit.HOURS); 79 } 80 } 81 82 private static void test() throws Exception { 83 84 for (int t = 0; t < hooks.length; t++) { 85 hooks[t] = new MyHook(); 86 } 87 88 ExecutorService service = Executors.newFixedThreadPool( 89 2, 90 r -> { 91 Thread t = new Thread(r); 92 t.setDaemon(true); 93 return t; 94 } 95 ); 96 97 List<Future<?>> futures = new ArrayList<>(); 98 for (int c = 0; c < 100; c++) { 99 Runtime.getRuntime().addShutdownHook(hooks[c]); 100 final Test[] tests = new Test[1000]; 101 for (int t = 0; t < tests.length; t++) { 102 tests[t] = new Test(); 103 } 104 105 Future<?> f1 = service.submit(() -> { 106 Runtime.getRuntime().addShutdownHook(new MyHook()); 107 IntResult2 r = new IntResult2(); 108 for (Test test : tests) { 109 test.RL_Us(r); 110 } 111 }); 112 Future<?> f2 = service.submit(() -> { 113 Runtime.getRuntime().addShutdownHook(new MyHook()); 114 for (Test test : tests) { 115 test.WLI_Us(); 116 } 117 }); 118 119 futures.add(f1); 120 futures.add(f2); 121 } 122 123 for (Future<?> f : futures) { 124 f.get(); 125 } 126 } 127 128 public static class IntResult2 { 129 int r1, r2; 130 } 131 132 public static class Test { 133 final StampedLock lock = new StampedLock(); 134 135 int x, y; 136 137 public void RL_Us(IntResult2 r) { 138 StampedLock lock = this.lock; 139 long stamp = lock.readLock(); 140 r.r1 = x; 141 r.r2 = y; 142 lock.unlock(stamp); 143 } 144 145 public void WLI_Us() { 146 try { 147 StampedLock lock = this.lock; 148 long stamp = lock.writeLockInterruptibly(); 149 x = 1; 150 y = 2; 151 lock.unlock(stamp); 152 } catch (InterruptedException e) { 153 throw new RuntimeException(e); 154 } 155 } 156 } 157 158 private static class MyHook extends Thread { 159 @Override 160 public void run() { 161 try { 162 Thread.sleep(10); 163 } catch (Exception e) {} 164 } 165 } 166 167 }