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