1 /*
   2  * Copyright (c) 2015, 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 8072466
  27  * @summary Deadlock when initializing MulticastSocket and DatagramSocket
  28  * @library /lib/testlibrary
  29  * @library /test/lib
  30  * @build jdk.testlibrary.*
  31  * @run main/othervm MultiDead
  32  */
  33 
  34 import java.net.DatagramSocket;
  35 import java.net.MulticastSocket;
  36 import java.util.concurrent.atomic.AtomicBoolean;
  37 import java.util.concurrent.atomic.AtomicReference;
  38 import java.util.concurrent.CountDownLatch;
  39 import static java.util.concurrent.TimeUnit.MILLISECONDS;
  40 import jdk.test.lib.JDKToolLauncher;
  41 import jdk.testlibrary.Utils;
  42 
  43 public class MultiDead {
  44     private static final int THREAD_PAIR_COUNT = 4;
  45     private static final int CHILDREN_COUNT = 20;
  46     // at least 2.5 seconds for a child to complete
  47     private static final long CHILD_TIMEOUT = 2500;
  48     private static final long TIMEOUT =
  49         Utils.adjustTimeout(CHILDREN_COUNT * CHILD_TIMEOUT * 2);
  50 
  51     public static void main(String[] args) throws Throwable {
  52         if (args.length == 0 || args[0].equals("parent")) {
  53             parentProcess();
  54         }
  55 
  56         if (args.length > 0 && args[0].equals("child")) {
  57             childProcess();
  58         }
  59     }
  60 
  61     private static void parentProcess() throws Throwable {
  62         JDKToolLauncher launcher = JDKToolLauncher
  63                 .createUsingTestJDK("java")
  64                 .addToolArg("MultiDead")
  65                 .addToolArg("child");
  66         ProcessBuilder pb = new ProcessBuilder(launcher.getCommand());
  67 
  68         AtomicReference<Process> child = new AtomicReference<>();
  69         AtomicBoolean stopFlag = new AtomicBoolean(false);
  70 
  71         Thread th = new Thread(() -> {
  72             for (int i = 0; i < CHILDREN_COUNT; ++i) {
  73                 System.out.println("child #" + (i + 1) + " of " +
  74                         CHILDREN_COUNT);
  75                 long start = System.nanoTime();
  76                 try {
  77                     child.set(pb.start());
  78                     child.get().waitFor();
  79                     if (stopFlag.get()) {
  80                         break;
  81                     }
  82                 } catch (Exception e) {
  83                     throw new RuntimeException(e);
  84                 }
  85                 if (System.nanoTime() - start >
  86                         MILLISECONDS.toNanos(CHILD_TIMEOUT)) {
  87                     System.err.println("Machine is too slow, " +
  88                             "skipping the test...");
  89                     break;
  90                 }
  91             }
  92         });
  93 
  94         th.start();
  95         th.join(TIMEOUT);
  96 
  97         stopFlag.set(true);
  98         if (th.isAlive()) {
  99             if (child.get() != null) {
 100                 child.get().destroyForcibly();
 101             }
 102             throw new RuntimeException("Failed to complete on time.");
 103         }
 104     }
 105 
 106     private static void childProcess() {
 107         CountDownLatch latch = new CountDownLatch(1);
 108         for (int i = 0; i < THREAD_PAIR_COUNT; ++i) {
 109             new Thread(() -> {
 110                 try {
 111                     latch.await();
 112                     try (MulticastSocket a = new MulticastSocket(6000)) {
 113                     }
 114                 } catch (Exception ignore) {
 115                 }
 116             }).start();
 117 
 118             new Thread(() -> {
 119                 try {
 120                     latch.await();
 121                     try (DatagramSocket b = new DatagramSocket(6000)) {
 122                     }
 123                 } catch (Exception ignore) {
 124                 }
 125             }).start();
 126         }
 127         latch.countDown();
 128     }
 129 }