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 LoggingDeadlock2
32 * @key randomness
33 */
34
35 /*
36 *
37 * There is a clear deadlock between LogManager.<clinit> and
38 * Cleaner.run() methods.
39 * T1 thread:
40 * The LogManager.<clinit> creates LogManager.manager object,
41 * sets shutdown hook with the Cleaner class and then waits
42 * to lock the LogManager.manager monitor.
43 * T2 thread:
44 * It is started by the System.exit() as shutdown hook thread.
45 * It locks the LogManager.manager monitor and then calls the
46 * static methods of the LogManager class (in this particular
47 * case it is a trick of the inner classes implementation).
48 * It is waits when the LogManager.<clinit> is completed.
49 *
50 * This is a regression test for this bug.
51 */
52
53 import java.util.Arrays;
54 import java.util.List;
55 import java.util.Random;
56 import java.util.concurrent.CyclicBarrier;
57 import java.util.concurrent.atomic.AtomicInteger;
58 import java.util.logging.LogManager;
59 import java.io.File;
60 import java.io.InputStream;
61 import java.io.InputStreamReader;
62 import java.io.Reader;
63
64 public class LoggingDeadlock2 {
65
66 public static void realMain(String arg[]) throws Throwable {
67 try {
68 System.out.println(javaChildArgs);
69 ProcessBuilder pb = new ProcessBuilder(javaChildArgs);
70 ProcessResults r = run(pb.start());
71 equal(r.exitValue(), 99);
72 equal(r.out(), "");
73 equal(r.err(), "");
74 } catch (Throwable t) { unexpected(t); }
75 }
76
77 public static class JavaChild {
78 public static void main(String args[]) throws Throwable {
79 final CyclicBarrier startingGate = new CyclicBarrier(2);
80 final Throwable[] thrown = new Throwable[1];
81
82 // Some random variation, to help tickle races.
83 final Random rnd = new Random();
84 final boolean dojoin = rnd.nextBoolean();
85 final int JITTER = 1024;
86 final int iters1 = rnd.nextInt(JITTER);
87 final int iters2 = JITTER - iters1;
88 final AtomicInteger counter = new AtomicInteger(0);
89
90 Thread exiter = new Thread() {
91 public void run() {
92 try {
93 startingGate.await();
94 for (int i = 0; i < iters1; i++)
95 counter.getAndIncrement();
96 System.exit(99);
97 } catch (Throwable t) {
98 t.printStackTrace();
99 System.exit(86);
100 }
101 }};
102 exiter.start();
103
104 startingGate.await();
105 for (int i = 0; i < iters2; i++)
106 counter.getAndIncrement();
107 // This may or may not result in a first call to
108 // Runtime.addShutdownHook after shutdown has already
109 // commenced.
110 LogManager.getLogManager();
111
112 if (dojoin) {
113 exiter.join();
114 if (thrown[0] != null)
115 throw new Error(thrown[0]);
116 check(counter.get() == JITTER);
117 }
118 }
119 }
120
121 //----------------------------------------------------------------
122 // The rest of this test is copied from ProcessBuilder/Basic.java
123 //----------------------------------------------------------------
124 private static final String javaExe =
125 System.getProperty("java.home") +
126 File.separator + "bin" + File.separator + "java";
127
128 private static final String classpath =
129 System.getProperty("java.class.path");
130
131 private static final List<String> javaChildArgs =
132 Arrays.asList(new String[]
133 { javaExe, "-classpath", classpath,
134 "LoggingDeadlock2$JavaChild"});
135
136 private static class ProcessResults {
137 private final String out;
138 private final String err;
139 private final int exitValue;
140 private final Throwable throwable;
141
142 public ProcessResults(String out,
143 String err,
144 int exitValue,
145 Throwable throwable) {
146 this.out = out;
147 this.err = err;
148 this.exitValue = exitValue;
149 this.throwable = throwable;
150 }
151
152 public String out() { return out; }
153 public String err() { return err; }
154 public int exitValue() { return exitValue; }
155
156 public String toString() {
157 StringBuilder sb = new StringBuilder();
158 sb.append("<STDOUT>\n" + out() + "</STDOUT>\n")
159 .append("<STDERR>\n" + err() + "</STDERR>\n")
160 .append("exitValue = " + exitValue + "\n");
161 if (throwable != null)
162 sb.append(throwable.getStackTrace());
163 return sb.toString();
164 }
165 }
166
167 private static class StreamAccumulator extends Thread {
168 private final InputStream is;
169 private final StringBuilder sb = new StringBuilder();
170 private Throwable throwable = null;
171
172 public String result () throws Throwable {
173 if (throwable != null)
174 throw throwable;
175 return sb.toString();
176 }
177
178 StreamAccumulator (InputStream is) {
179 this.is = is;
180 }
181
182 public void run() {
183 try {
184 Reader r = new InputStreamReader(is);
185 char[] buf = new char[4096];
186 int n;
187 while ((n = r.read(buf)) > 0) {
188 sb.append(buf,0,n);
189 }
190 } catch (Throwable t) {
191 throwable = t;
192 } finally {
193 try { is.close(); }
194 catch (Throwable t) { throwable = t; }
195 }
196 }
197 }
198
199 private static ProcessResults run(Process p) {
200 Throwable throwable = null;
201 int exitValue = -1;
202 String out = "";
203 String err = "";
204
205 StreamAccumulator outAccumulator =
206 new StreamAccumulator(p.getInputStream());
207 StreamAccumulator errAccumulator =
208 new StreamAccumulator(p.getErrorStream());
209
210 try {
211 outAccumulator.start();
212 errAccumulator.start();
213
214 exitValue = p.waitFor();
215
216 outAccumulator.join();
217 errAccumulator.join();
218
219 out = outAccumulator.result();
220 err = errAccumulator.result();
221 } catch (Throwable t) {
222 throwable = t;
223 }
224
225 return new ProcessResults(out, err, exitValue, throwable);
226 }
227
228 //--------------------- Infrastructure ---------------------------
229 static volatile int passed = 0, failed = 0;
230 static void pass() {passed++;}
231 static void fail() {failed++; Thread.dumpStack();}
232 static void fail(String msg) {System.out.println(msg); fail();}
233 static void unexpected(Throwable t) {failed++; t.printStackTrace();}
234 static void check(boolean cond) {if (cond) pass(); else fail();}
235 static void check(boolean cond, String m) {if (cond) pass(); else fail(m);}
236 static void equal(Object x, Object y) {
237 if (x == null ? y == null : x.equals(y)) pass();
238 else fail(x + " not equal to " + y);}
239 public static void main(String[] args) throws Throwable {
240 try {realMain(args);} catch (Throwable t) {unexpected(t);}
241 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
242 if (failed > 0) throw new AssertionError("Some tests failed");}
243 }