1 /* 2 * Copyright (c) 2016, 2020, 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 & !vm.graal.enabled 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 // Use 1/4 of available processors to avoid over provisioning thread pool on many core 53 // systems. 54 int numProcessors = Runtime.getRuntime().availableProcessors(); 55 ExecutorService pool = Executors.newFixedThreadPool(Math.max(1, numProcessors / 4)); 56 Future<?>[] fs = new Future<?>[NUM_RUNS]; 57 58 for (int c = 0; c < NUM_RUNS; c++) { 59 Callable<Void> task = () -> { 60 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xms128m", 61 "-Xmx128m", 62 "-XX:+UnlockExperimentalVMOptions", 63 "-XX:+UnlockDiagnosticVMOptions", 64 "-XX:+UseShenandoahGC", 65 "-XX:ShenandoahGCHeuristics=aggressive", 66 "TestEvilSyncBug", "test"); 67 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 68 output.shouldHaveExitValue(0); 69 return null; 70 }; 71 fs[c] = pool.submit(task); 72 } 73 74 for (Future<?> f : fs) { 75 f.get(); 76 } 77 78 pool.shutdown(); 79 pool.awaitTermination(1, TimeUnit.HOURS); 80 } 81 } 82 83 private static void test() throws Exception { 84 85 for (int t = 0; t < hooks.length; t++) { 86 hooks[t] = new MyHook(); 87 } 88 89 ExecutorService service = Executors.newFixedThreadPool( 90 2, 91 r -> { 92 Thread t = new Thread(r); 93 t.setDaemon(true); 94 return t; 95 } 96 ); 97 98 List<Future<?>> futures = new ArrayList<>(); 99 for (int c = 0; c < 100; c++) { 100 Runtime.getRuntime().addShutdownHook(hooks[c]); 101 final Test[] tests = new Test[1000]; 102 for (int t = 0; t < tests.length; t++) { 103 tests[t] = new Test(); 104 } 105 106 Future<?> f1 = service.submit(() -> { 107 Runtime.getRuntime().addShutdownHook(new MyHook()); 108 IntResult2 r = new IntResult2(); 109 for (Test test : tests) { 110 test.RL_Us(r); 111 } 112 }); 113 Future<?> f2 = service.submit(() -> { 114 Runtime.getRuntime().addShutdownHook(new MyHook()); 115 for (Test test : tests) { 116 test.WLI_Us(); 117 } 118 }); 119 120 futures.add(f1); 121 futures.add(f2); 122 } 123 124 for (Future<?> f : futures) { 125 f.get(); 126 } 127 } 128 129 public static class IntResult2 { 130 int r1, r2; 131 } 132 133 public static class Test { 134 final StampedLock lock = new StampedLock(); 135 136 int x, y; 137 138 public void RL_Us(IntResult2 r) { 139 StampedLock lock = this.lock; 140 long stamp = lock.readLock(); 141 r.r1 = x; 142 r.r2 = y; 143 lock.unlock(stamp); 144 } 145 146 public void WLI_Us() { 147 try { 148 StampedLock lock = this.lock; 149 long stamp = lock.writeLockInterruptibly(); 150 x = 1; 151 y = 2; 152 lock.unlock(stamp); 153 } catch (InterruptedException e) { 154 throw new RuntimeException(e); 155 } 156 } 157 } 158 159 private static class MyHook extends Thread { 160 @Override 161 public void run() { 162 try { 163 Thread.sleep(10); 164 } catch (Exception e) {} 165 } 166 } 167 168 }