LoggingDeadlock2.java revision 6264:a68090f0dc1a 
1/*
2 * Copyright (c) 2006, 2012, Oracle and/or its affiliates. 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 * @test
26 * @bug     6467152 6716076 6829503
27 * @summary deadlock occurs in LogManager initialization and JVM termination
28 * @author  Serguei Spitsyn / Hitachi / Martin Buchholz
29 *
30 * @build    LoggingDeadlock2
31 * @run  main/timeout=15 LoggingDeadlock2
32 *
33 * There is a clear deadlock between LogManager.<clinit> and
34 * Cleaner.run() methods.
35 * T1 thread:
36 *   The LogManager.<clinit> creates LogManager.manager object,
37 *   sets shutdown hook with the Cleaner class and then waits
38 *   to lock the LogManager.manager monitor.
39 * T2 thread:
40 *   It is started by the System.exit() as shutdown hook thread.
41 *   It locks the LogManager.manager monitor and then calls the
42 *   static methods of the LogManager class (in this particular
43 *   case it is a trick of the inner classes implementation).
44 *   It is waits when the LogManager.<clinit> is completed.
45 *
46 * This is a regression test for this bug.
47 */
48
49import java.util.Arrays;
50import java.util.List;
51import java.util.Random;
52import java.util.concurrent.CyclicBarrier;
53import java.util.concurrent.atomic.AtomicInteger;
54import java.util.logging.LogManager;
55import java.io.File;
56import java.io.InputStream;
57import java.io.InputStreamReader;
58import java.io.Reader;
59
60public class LoggingDeadlock2 {
61
62    public static void realMain(String arg[]) throws Throwable {
63        try {
64            System.out.println(javaChildArgs);
65            ProcessBuilder pb = new ProcessBuilder(javaChildArgs);
66            ProcessResults r = run(pb.start());
67            equal(r.exitValue(), 99);
68            equal(r.out(), "");
69            equal(r.err(), "");
70        } catch (Throwable t) { unexpected(t); }
71    }
72
73    public static class JavaChild {
74        public static void main(String args[]) throws Throwable {
75            final CyclicBarrier startingGate = new CyclicBarrier(2);
76            final Throwable[] thrown = new Throwable[1];
77
78            // Some random variation, to help tickle races.
79            final Random rnd = new Random();
80            final boolean dojoin = rnd.nextBoolean();
81            final int JITTER = 1024;
82            final int iters1 = rnd.nextInt(JITTER);
83            final int iters2 = JITTER - iters1;
84            final AtomicInteger counter = new AtomicInteger(0);
85
86            Thread exiter = new Thread() {
87                public void run() {
88                    try {
89                        startingGate.await();
90                        for (int i = 0; i < iters1; i++)
91                            counter.getAndIncrement();
92                        System.exit(99);
93                    } catch (Throwable t) {
94                        t.printStackTrace();
95                        System.exit(86);
96                    }
97                }};
98            exiter.start();
99
100            startingGate.await();
101            for (int i = 0; i < iters2; i++)
102                counter.getAndIncrement();
103            // This may or may not result in a first call to
104            // Runtime.addShutdownHook after shutdown has already
105            // commenced.
106            LogManager.getLogManager();
107
108            if (dojoin) {
109                exiter.join();
110                if (thrown[0] != null)
111                    throw new Error(thrown[0]);
112                check(counter.get() == JITTER);
113            }
114        }
115    }
116
117    //----------------------------------------------------------------
118    // The rest of this test is copied from ProcessBuilder/Basic.java
119    //----------------------------------------------------------------
120    private static final String javaExe =
121        System.getProperty("java.home") +
122        File.separator + "bin" + File.separator + "java";
123
124    private static final String classpath =
125        System.getProperty("java.class.path");
126
127    private static final List<String> javaChildArgs =
128        Arrays.asList(new String[]
129            { javaExe, "-classpath", classpath,
130              "LoggingDeadlock2$JavaChild"});
131
132    private static class ProcessResults {
133        private final String out;
134        private final String err;
135        private final int exitValue;
136        private final Throwable throwable;
137
138        public ProcessResults(String out,
139                              String err,
140                              int exitValue,
141                              Throwable throwable) {
142            this.out = out;
143            this.err = err;
144            this.exitValue = exitValue;
145            this.throwable = throwable;
146        }
147
148        public String out()          { return out; }
149        public String err()          { return err; }
150        public int exitValue()       { return exitValue; }
151
152        public String toString() {
153            StringBuilder sb = new StringBuilder();
154            sb.append("<STDOUT>\n" + out() + "</STDOUT>\n")
155                .append("<STDERR>\n" + err() + "</STDERR>\n")
156                .append("exitValue = " + exitValue + "\n");
157            if (throwable != null)
158                sb.append(throwable.getStackTrace());
159            return sb.toString();
160        }
161    }
162
163    private static class StreamAccumulator extends Thread {
164        private final InputStream is;
165        private final StringBuilder sb = new StringBuilder();
166        private Throwable throwable = null;
167
168        public String result () throws Throwable {
169            if (throwable != null)
170                throw throwable;
171            return sb.toString();
172        }
173
174        StreamAccumulator (InputStream is) {
175            this.is = is;
176        }
177
178        public void run() {
179            try {
180                Reader r = new InputStreamReader(is);
181                char[] buf = new char[4096];
182                int n;
183                while ((n = r.read(buf)) > 0) {
184                    sb.append(buf,0,n);
185                }
186            } catch (Throwable t) {
187                throwable = t;
188            } finally {
189                try { is.close(); }
190                catch (Throwable t) { throwable = t; }
191            }
192        }
193    }
194
195    private static ProcessResults run(Process p) {
196        Throwable throwable = null;
197        int exitValue = -1;
198        String out = "";
199        String err = "";
200
201        StreamAccumulator outAccumulator =
202            new StreamAccumulator(p.getInputStream());
203        StreamAccumulator errAccumulator =
204            new StreamAccumulator(p.getErrorStream());
205
206        try {
207            outAccumulator.start();
208            errAccumulator.start();
209
210            exitValue = p.waitFor();
211
212            outAccumulator.join();
213            errAccumulator.join();
214
215            out = outAccumulator.result();
216            err = errAccumulator.result();
217        } catch (Throwable t) {
218            throwable = t;
219        }
220
221        return new ProcessResults(out, err, exitValue, throwable);
222    }
223
224    //--------------------- Infrastructure ---------------------------
225    static volatile int passed = 0, failed = 0;
226    static void pass() {passed++;}
227    static void fail() {failed++; Thread.dumpStack();}
228    static void fail(String msg) {System.out.println(msg); fail();}
229    static void unexpected(Throwable t) {failed++; t.printStackTrace();}
230    static void check(boolean cond) {if (cond) pass(); else fail();}
231    static void check(boolean cond, String m) {if (cond) pass(); else fail(m);}
232    static void equal(Object x, Object y) {
233        if (x == null ? y == null : x.equals(y)) pass();
234        else fail(x + " not equal to " + y);}
235    public static void main(String[] args) throws Throwable {
236        try {realMain(args);} catch (Throwable t) {unexpected(t);}
237        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
238        if (failed > 0) throw new AssertionError("Some tests failed");}
239}
240