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 }