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