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 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xms128m",
60 "-Xmx128m",
61 "-XX:+UnlockExperimentalVMOptions",
62 "-XX:+UnlockDiagnosticVMOptions",
63 "-XX:+UseShenandoahGC",
64 "-XX:ShenandoahGCHeuristics=aggressive",
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 }