1 /*
2 * Copyright (c) 2016, 2020, Red Hat, Inc. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 /*
26 * @test
27 * @summary Tests for crash/assert when attaching init thread during shutdown
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 // Use 1/4 of available processors to avoid over-saturation.
53 int numJobs = Math.max(1, Runtime.getRuntime().availableProcessors() / 4);
54 ExecutorService pool = Executors.newFixedThreadPool(numJobs);
55 Future<?>[] fs = new Future<?>[NUM_RUNS];
56
57 for (int c = 0; c < NUM_RUNS; c++) {
58 Callable<Void> task = () -> {
59 OutputAnalyzer output = ProcessTools.executeLimitedTestJava("-Xms128m",
60 "-Xmx128m",
61 "-XX:+UnlockExperimentalVMOptions",
62 "-XX:+UnlockDiagnosticVMOptions",
63 "-XX:+UseShenandoahGC",
64 "-XX:ShenandoahGCHeuristics=aggressive",
65 "TestEvilSyncBug", "test");
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 }