1 /*
  2  * Copyright (c) 2016, 2020, Red Hat, Inc. All rights reserved.
  3  * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
  4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  5  *
  6  * This code is free software; you can redistribute it and/or modify it
  7  * under the terms of the GNU General Public License version 2 only, as
  8  * published by the Free Software Foundation.
  9  *
 10  * This code is distributed in the hope that it will be useful, but WITHOUT
 11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 13  * version 2 for more details (a copy is included in the LICENSE file that
 14  * accompanied this code).
 15  *
 16  * You should have received a copy of the GNU General Public License version
 17  * 2 along with this work; if not, write to the Free Software Foundation,
 18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 19  *
 20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 21  * or visit www.oracle.com if you need additional information or have any
 22  * questions.
 23  *
 24  */
 25 
 26 /*
 27  * @test id=default
 28  * @summary Tests for crash/assert when attaching init thread during shutdown
 29  * @requires vm.gc.Shenandoah
 30  * @library /test/lib
 31  * @modules java.base/jdk.internal.misc
 32  *          java.management
 33  * @run driver/timeout=480 TestEvilSyncBug -XX:ShenandoahGCHeuristics=aggressive
 34  */
 35 
 36 /*
 37  * @test id=generational
 38  * @summary Tests for crash/assert when attaching init thread during shutdown
 39  * @requires vm.gc.Shenandoah
 40  * @library /test/lib
 41  * @modules java.base/jdk.internal.misc
 42  *          java.management
 43  * @run driver/timeout=480 TestEvilSyncBug -XX:ShenandoahGCMode=generational
 44  */
 45 
 46 import java.util.*;
 47 import java.util.concurrent.*;
 48 import java.util.concurrent.locks.*;
 49 
 50 import jdk.test.lib.process.ProcessTools;
 51 import jdk.test.lib.process.OutputAnalyzer;
 52 
 53 public class TestEvilSyncBug {
 54 
 55     private static final int NUM_RUNS = 100;
 56 
 57     static Thread[] hooks = new MyHook[10000];
 58 
 59     public static void main(String[] args) throws Exception {
 60         if ("test".equals(args[0])) {
 61             test();
 62         } else {
 63             String options = args[0];
 64             // Use 1/4 of available processors to avoid over-saturation.
 65             int numJobs = Math.max(1, Runtime.getRuntime().availableProcessors() / 4);
 66             ExecutorService pool = Executors.newFixedThreadPool(numJobs);
 67             Future<?>[] fs = new Future<?>[NUM_RUNS];
 68 
 69             for (int c = 0; c < NUM_RUNS; c++) {
 70                 Callable<Void> task = () -> {
 71                     ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder("-Xms128m",
 72                             "-Xmx128m",
 73                             "-XX:+UnlockExperimentalVMOptions",
 74                             "-XX:+UnlockDiagnosticVMOptions",
 75                             "-XX:+UseShenandoahGC",
 76                             options,
 77                             "TestEvilSyncBug", "test");
 78                     OutputAnalyzer output = new OutputAnalyzer(pb.start());
 79                     output.shouldHaveExitValue(0);
 80                     return null;
 81                 };
 82                 fs[c] = pool.submit(task);
 83             }
 84 
 85             for (Future<?> f : fs) {
 86                 f.get();
 87             }
 88 
 89             pool.shutdown();
 90             pool.awaitTermination(1, TimeUnit.HOURS);
 91         }
 92     }
 93 
 94     private static void test() throws Exception {
 95 
 96         for (int t = 0; t < hooks.length; t++) {
 97             hooks[t] = new MyHook();
 98         }
 99 
100         ExecutorService service = Executors.newFixedThreadPool(
101                 2,
102                 r -> {
103                     Thread t = new Thread(r);
104                     t.setDaemon(true);
105                     return t;
106                 }
107         );
108 
109         List<Future<?>> futures = new ArrayList<>();
110         for (int c = 0; c < 100; c++) {
111             Runtime.getRuntime().addShutdownHook(hooks[c]);
112             final Test[] tests = new Test[1000];
113             for (int t = 0; t < tests.length; t++) {
114                 tests[t] = new Test();
115             }
116 
117             Future<?> f1 = service.submit(() -> {
118                 Runtime.getRuntime().addShutdownHook(new MyHook());
119                 IntResult2 r = new IntResult2();
120                 for (Test test : tests) {
121                     test.RL_Us(r);
122                 }
123             });
124             Future<?> f2 = service.submit(() -> {
125                 Runtime.getRuntime().addShutdownHook(new MyHook());
126                 for (Test test : tests) {
127                     test.WLI_Us();
128                 }
129             });
130 
131             futures.add(f1);
132             futures.add(f2);
133         }
134 
135         for (Future<?> f : futures) {
136             f.get();
137         }
138     }
139 
140     public static class IntResult2 {
141         int r1, r2;
142     }
143 
144     public static class Test {
145         final StampedLock lock = new StampedLock();
146 
147         int x, y;
148 
149         public void RL_Us(IntResult2 r) {
150             StampedLock lock = this.lock;
151             long stamp = lock.readLock();
152             r.r1 = x;
153             r.r2 = y;
154             lock.unlock(stamp);
155         }
156 
157         public void WLI_Us() {
158             try {
159                 StampedLock lock = this.lock;
160                 long stamp = lock.writeLockInterruptibly();
161                 x = 1;
162                 y = 2;
163                 lock.unlock(stamp);
164             } catch (InterruptedException e) {
165                 throw new RuntimeException(e);
166             }
167         }
168     }
169 
170     private static class MyHook extends Thread {
171         @Override
172         public void run() {
173             try {
174                 Thread.sleep(10);
175             } catch (Exception e) {}
176         }
177     }
178 
179 }