8072466: Deadlock when initializing MulticastSocket and DatagramSocket

Reviewed-by: chegar

make/mapfiles/libnet/mapfile-vers

 #
-# Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -28,8 +28,7 @@
 SUNWprivate_1.1 {
 	global:
 		JNI_OnLoad;
-		Java_java_net_AbstractPlainDatagramSocketImpl_init;
-		Java_java_net_AbstractPlainDatagramSocketImpl_dataAvailable;
+		Java_java_net_PlainDatagramSocketImpl_dataAvailable;
 		Java_java_net_PlainSocketImpl_socketListen;
 		Java_java_net_PlainDatagramSocketImpl_getTTL;
 		Java_java_net_PlainDatagramSocketImpl_init;

src/share/classes/java/net/AbstractPlainDatagramSocketImpl.java

 /*
- * Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -68,7 +68,6 @@ abstract class AbstractPlainDatagramSocketImpl extends DatagramSocketImpl
                     return null;
                 }
             });
-        init();
     }
 
     /**
@@ -364,6 +363,5 @@ abstract class AbstractPlainDatagramSocketImpl extends DatagramSocketImpl
         return connectDisabled;
     }
 
-    native int dataAvailable();
-    private static native void init();
+    abstract int dataAvailable();
 }

src/solaris/classes/java/net/PlainDatagramSocketImpl.java

 /*
- * Copyright (c) 2007,2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -119,6 +119,8 @@ class PlainDatagramSocketImpl extends AbstractPlainDatagramSocketImpl
 
     protected native void disconnect0(int family);
 
+    native int dataAvailable();
+
     /**
      * Perform class load-time initializations.
      */

src/solaris/native/java/net/AbstractPlainDatagramSocketImpl.c

-/*
- * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.  Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-#include <sys/types.h>
-#include <sys/socket.h>
-
-#ifdef __solaris__
-#include <unistd.h>
-#include <stropts.h>
-
-#ifndef BSD_COMP
-#define BSD_COMP
-#endif
-
-#endif
-
-#include <sys/ioctl.h>
-
-#include "jvm.h"
-#include "jni_util.h"
-#include "net_util.h"
-
-#include "java_net_AbstractPlainDatagramSocketImpl.h"
-
-static jfieldID IO_fd_fdID;
-
-static jfieldID apdsi_fdID;
-
-
-/*
- * Class:     java_net_AbstractPlainDatagramSocketImpl
- * Method:    init
- * Signature: ()V
- */
-JNIEXPORT void JNICALL
-Java_java_net_AbstractPlainDatagramSocketImpl_init(JNIEnv *env, jclass cls) {
-
-    apdsi_fdID = (*env)->GetFieldID(env, cls, "fd",
-                                   "Ljava/io/FileDescriptor;");
-    CHECK_NULL(apdsi_fdID);
-
-    IO_fd_fdID = NET_GetFileDescriptorID(env);
-}
-
-/*
- * Class:     java_net_AbstractPlainDatagramSocketImpl
- * Method:    dataAvailable
- * Signature: ()I
- */
-JNIEXPORT jint JNICALL Java_java_net_AbstractPlainDatagramSocketImpl_dataAvailable
-(JNIEnv *env, jobject this) {
-    int fd, retval;
-
-    jobject fdObj = (*env)->GetObjectField(env, this, apdsi_fdID);
-
-    if (IS_NULL(fdObj)) {
-        JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",
-                        "Socket closed");
-        return -1;
-    }
-    fd = (*env)->GetIntField(env, fdObj, IO_fd_fdID);
-
-    if (ioctl(fd, FIONREAD, &retval) < 0) {
-        return -1;
-    }
-    return retval;
-}

src/solaris/native/java/net/PlainDatagramSocketImpl.c

 /*
- * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -32,6 +32,12 @@
 
 #ifdef __solaris__
 #include <fcntl.h>
+#include <unistd.h>
+#include <stropts.h>
+
+#ifndef BSD_COMP
+#define BSD_COMP
+#endif
 #endif
 #ifdef __linux__
 #include <unistd.h>
@@ -52,6 +58,8 @@
 #endif
 #endif  //  __linux__
 
+#include <sys/ioctl.h>
+
 #ifndef IPTOS_TOS_MASK
 #define IPTOS_TOS_MASK 0x1e
 #endif
@@ -2265,3 +2273,28 @@ Java_java_net_PlainDatagramSocketImpl_leave(JNIEnv *env, jobject this,
 {
     mcast_join_leave(env, this, iaObj, niObj, JNI_FALSE);
 }
+
+/*
+ * Class:     java_net_PlainDatagramSocketImpl
+ * Method:    dataAvailable
+ * Signature: ()I
+ */
+JNIEXPORT jint JNICALL
+Java_java_net_PlainDatagramSocketImpl_dataAvailable(JNIEnv *env, jobject this)
+{
+    int fd, retval;
+
+    jobject fdObj = (*env)->GetObjectField(env, this, pdsi_fdID);
+
+    if (IS_NULL(fdObj)) {
+        JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",
+                        "Socket closed");
+        return -1;
+    }
+    fd = (*env)->GetIntField(env, fdObj, IO_fd_fdID);
+
+    if (ioctl(fd, FIONREAD, &retval) < 0) {
+        return -1;
+    }
+    return retval;
+}

src/windows/classes/java/net/DefaultDatagramSocketImplFactory.java

 /*
- * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -45,7 +45,7 @@ import java.security.PrivilegedAction;
 
 class DefaultDatagramSocketImplFactory
 {
-    static Class<?> prefixImplClass = null;
+    private final static Class<?> prefixImplClass;
 
     /* the windows version. */
     private static float version;
@@ -54,16 +54,19 @@ class DefaultDatagramSocketImplFactory
     private static boolean preferIPv4Stack = false;
 
     /* If the version supports a dual stack TCP implementation */
-    private static boolean useDualStackImpl = false;
+    private final static boolean useDualStackImpl;
 
     /* sun.net.useExclusiveBind */
     private static String exclBindProp;
 
     /* True if exclusive binding is on for Windows */
-    private static boolean exclusiveBind = true;
-
+    private final static boolean exclusiveBind;
 
     static {
+        Class<?> prefixImplClassLocal = null;
+        boolean useDualStackImplLocal = false;
+        boolean exclusiveBindLocal = true;
+
         // Determine Windows Version.
         java.security.AccessController.doPrivileged(
                 new PrivilegedAction<Object>() {
@@ -78,7 +81,7 @@ class DefaultDatagramSocketImplFactory
                                                    "java.net.preferIPv4Stack"));
                             exclBindProp = System.getProperty(
                                     "sun.net.useExclusiveBind");
-                        } catch (NumberFormatException e ) {
+                        } catch (NumberFormatException e) {
                             assert false : e;
                         }
                         return null; // nothing to return
@@ -87,14 +90,14 @@ class DefaultDatagramSocketImplFactory
 
         // (version >= 6.0) implies Vista or greater.
         if (version >= 6.0 && !preferIPv4Stack) {
-                useDualStackImpl = true;
+            useDualStackImplLocal = true;
         }
         if (exclBindProp != null) {
             // sun.net.useExclusiveBind is true
-            exclusiveBind = exclBindProp.length() == 0 ? true
+            exclusiveBindLocal = exclBindProp.length() == 0 ? true
                     : Boolean.parseBoolean(exclBindProp);
         } else if (version < 6.0) {
-            exclusiveBind = false;
+            exclusiveBindLocal = false;
         }
 
         // impl.prefix
@@ -103,12 +106,16 @@ class DefaultDatagramSocketImplFactory
             prefix = AccessController.doPrivileged(
                 new sun.security.action.GetPropertyAction("impl.prefix", null));
             if (prefix != null)
-                prefixImplClass = Class.forName("java.net."+prefix+"DatagramSocketImpl");
+                prefixImplClassLocal = Class.forName("java.net."+prefix+"DatagramSocketImpl");
         } catch (Exception e) {
             System.err.println("Can't find class: java.net." +
                                 prefix +
                                 "DatagramSocketImpl: check impl.prefix property");
         }
+
+        prefixImplClass = prefixImplClassLocal;
+        useDualStackImpl = useDualStackImplLocal;
+        exclusiveBind = exclusiveBindLocal;
     }
 
     /**
@@ -126,12 +133,10 @@ class DefaultDatagramSocketImplFactory
                 throw new SocketException("can't instantiate DatagramSocketImpl");
             }
         } else {
-            if (isMulticast)
-                exclusiveBind = false;
             if (useDualStackImpl && !isMulticast)
                 return new DualStackPlainDatagramSocketImpl(exclusiveBind);
             else
-                return new TwoStacksPlainDatagramSocketImpl(exclusiveBind);
+                return new TwoStacksPlainDatagramSocketImpl(exclusiveBind && !isMulticast);
         }
     }
 }

src/windows/classes/java/net/DualStackPlainDatagramSocketImpl.java

 /*
- * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -45,6 +45,10 @@ class DualStackPlainDatagramSocketImpl extends AbstractPlainDatagramSocketImpl
 {
     static JavaIOFileDescriptorAccess fdAccess = SharedSecrets.getJavaIOFileDescriptorAccess();
 
+    static {
+        initIDs();
+    }
+
     // true if this socket is exclusively bound
     private final boolean exclusiveBind;
 
@@ -288,4 +292,6 @@ class DualStackPlainDatagramSocketImpl extends AbstractPlainDatagramSocketImpl
         int optionValue) throws SocketException;
 
     private static native int socketGetIntOption(int fd, int cmd) throws SocketException;
+
+    native int dataAvailable();
 }

src/windows/classes/java/net/TwoStacksPlainDatagramSocketImpl.java

 /*
- * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -207,6 +207,8 @@ class TwoStacksPlainDatagramSocketImpl extends AbstractPlainDatagramSocketImpl
 
     protected native void disconnect0(int family);
 
+    native int dataAvailable();
+
     /**
      * Perform class load-time initializations.
      */

src/windows/native/java/net/AbstractPlainDatagramSocketImpl.c

-/*
- * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.  Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-#include <windows.h>
-#include <winsock2.h>
-
-#include "jvm.h"
-#include "jni_util.h"
-#include "net_util.h"
-
-#include "java_net_AbstractPlainDatagramSocketImpl.h"
-
-static jfieldID IO_fd_fdID = NULL;
-static jfieldID apdsi_fdID = NULL;
-
-static jfieldID apdsi_fd1ID = NULL;
-static jclass two_stacks_clazz = NULL;
-
-
-/*
- * Class:     java_net_AbstractPlainDatagramSocketImpl
- * Method:    init
- * Signature: ()V
- */
-JNIEXPORT void JNICALL
-Java_java_net_AbstractPlainDatagramSocketImpl_init(JNIEnv *env, jclass cls) {
-
-    apdsi_fdID = (*env)->GetFieldID(env, cls, "fd",
-                                   "Ljava/io/FileDescriptor;");
-    CHECK_NULL(apdsi_fdID);
-    IO_fd_fdID = NET_GetFileDescriptorID(env);
-    CHECK_NULL(IO_fd_fdID);
-
-    two_stacks_clazz = (*env)->FindClass(env, "java/net/TwoStacksPlainDatagramSocketImpl");
-    CHECK_NULL(two_stacks_clazz);
-
-    /* Handle both TwoStacks and DualStack here */
-
-    if (JNU_Equals(env, cls, two_stacks_clazz)) {
-        /* fd1 present only in TwoStack.. */
-        apdsi_fd1ID = (*env)->GetFieldID(env, cls, "fd1",
-                                   "Ljava/io/FileDescriptor;");
-        CHECK_NULL(apdsi_fd1ID);
-    }
-
-    JNU_CHECK_EXCEPTION(env);
-}
-
-/*
- * Class:     java_net_AbstractPlainDatagramSocketImpl
- * Method:    dataAvailable
- * Signature: ()I
- */
-JNIEXPORT jint JNICALL Java_java_net_AbstractPlainDatagramSocketImpl_dataAvailable
-(JNIEnv *env, jobject this) {
-    SOCKET fd;
-    SOCKET fd1;
-    int  rv = -1, rv1 = -1;
-    jobject fdObj = (*env)->GetObjectField(env, this, apdsi_fdID);
-
-    if (!IS_NULL(fdObj)) {
-        int retval = 0;
-        fd = (SOCKET)(*env)->GetIntField(env, fdObj, IO_fd_fdID);
-        rv = ioctlsocket(fd, FIONREAD, &retval);
-        if (retval > 0) {
-            return retval;
-        }
-    }
-
-    if (!IS_NULL(apdsi_fd1ID)) {
-        /* TwoStacks */
-        jobject fd1Obj = (*env)->GetObjectField(env, this, apdsi_fd1ID);
-        if (!IS_NULL(fd1Obj)) {
-            int retval = 0;
-            fd1 = (SOCKET)(*env)->GetIntField(env, fd1Obj, IO_fd_fdID);
-            rv1 = ioctlsocket(fd1, FIONREAD, &retval);
-            if (retval > 0) {
-                return retval;
-            }
-        }
-    }
-
-    if (rv < 0 && rv1 < 0) {
-        JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",
-                            "Socket closed");
-        return -1;
-    }
-
-    return 0;
-}
-

src/windows/native/java/net/DualStackPlainDatagramSocketImpl.c

 /*
- * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -70,6 +70,25 @@ static jboolean purgeOutstandingICMP(JNIEnv *env, jint fd)
     return got_icmp;
 }
 
+static jfieldID IO_fd_fdID = NULL;
+static jfieldID pdsi_fdID = NULL;
+
+/*
+ * Class:     java_net_DualStackPlainDatagramSocketImpl
+ * Method:    initIDs
+ * Signature: ()V
+ */
+JNIEXPORT void JNICALL Java_java_net_DualStackPlainDatagramSocketImpl_initIDs
+  (JNIEnv *env, jclass clazz)
+{
+    pdsi_fdID = (*env)->GetFieldID(env, clazz, "fd",
+                                   "Ljava/io/FileDescriptor;");
+    CHECK_NULL(pdsi_fdID);
+    IO_fd_fdID = NET_GetFileDescriptorID(env);
+    CHECK_NULL(IO_fd_fdID);
+    JNU_CHECK_EXCEPTION(env);
+}
+
 /*
  * Class:     java_net_DualStackPlainDatagramSocketImpl
  * Method:    socketCreate
@@ -498,3 +517,32 @@ JNIEXPORT jint JNICALL Java_java_net_DualStackPlainDatagramSocketImpl_socketGetI
 
     return result;
 }
+
+/*
+ * Class:     java_net_DualStackPlainDatagramSocketImpl
+ * Method:    dataAvailable
+ * Signature: ()I
+ */
+JNIEXPORT jint JNICALL Java_java_net_DualStackPlainDatagramSocketImpl_dataAvailable
+(JNIEnv *env, jobject this) {
+    SOCKET fd;
+    int  rv = -1;
+    jobject fdObj = (*env)->GetObjectField(env, this, pdsi_fdID);
+
+    if (!IS_NULL(fdObj)) {
+        int retval = 0;
+        fd = (SOCKET)(*env)->GetIntField(env, fdObj, IO_fd_fdID);
+        rv = ioctlsocket(fd, FIONREAD, &retval);
+        if (retval > 0) {
+            return retval;
+        }
+    }
+
+    if (rv < 0) {
+        JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",
+                        "Socket closed");
+        return -1;
+    }
+
+    return 0;
+}

src/windows/native/java/net/TwoStacksPlainDatagramSocketImpl.c

 /*
- * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -2591,3 +2591,44 @@ Java_java_net_TwoStacksPlainDatagramSocketImpl_leave(JNIEnv *env, jobject this,
 {
     mcast_join_leave (env, this, iaObj, niObj, JNI_FALSE);
 }
+
+/*
+ * Class:     java_net_TwoStacksPlainDatagramSocketImpl
+ * Method:    dataAvailable
+ * Signature: ()I
+ */
+JNIEXPORT jint JNICALL Java_java_net_TwoStacksPlainDatagramSocketImpl_dataAvailable
+(JNIEnv *env, jobject this) {
+    SOCKET fd;
+    SOCKET fd1;
+    int  rv = -1, rv1 = -1;
+    jobject fdObj = (*env)->GetObjectField(env, this, pdsi_fdID);
+    jobject fd1Obj;
+
+    if (!IS_NULL(fdObj)) {
+        int retval = 0;
+        fd = (SOCKET)(*env)->GetIntField(env, fdObj, IO_fd_fdID);
+        rv = ioctlsocket(fd, FIONREAD, &retval);
+        if (retval > 0) {
+            return retval;
+        }
+    }
+
+    fd1Obj = (*env)->GetObjectField(env, this, pdsi_fd1ID);
+    if (!IS_NULL(fd1Obj)) {
+        int retval = 0;
+        fd1 = (SOCKET)(*env)->GetIntField(env, fd1Obj, IO_fd_fdID);
+        rv1 = ioctlsocket(fd1, FIONREAD, &retval);
+        if (retval > 0) {
+            return retval;
+        }
+    }
+
+    if (rv < 0 && rv1 < 0) {
+        JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",
+                        "Socket closed");
+        return -1;
+    }
+
+    return 0;
+}

test/java/net/MulticastSocket/MultiDead.java

+/*
+ * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * @test
+ * @bug 8072466
+ * @summary Deadlock when initializing MulticastSocket and DatagramSocket
+ * @library /lib/testlibrary
+ * @build jdk.testlibrary.*
+ * @run main/othervm MultiDead
+ */
+
+import java.net.DatagramSocket;
+import java.net.MulticastSocket;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.concurrent.CountDownLatch;
+import jdk.testlibrary.JDKToolLauncher;
+
+public class MultiDead {
+    private static final int THREAD_PAIR_COUNT = 4;
+    private static final int CHILDREN_COUNT = 20;
+
+    public static void main(String[] args) throws Throwable {
+        if (args.length == 0 || args[0].equals("parent")) {
+            parentProcess();
+        }
+
+        if (args.length > 0 && args[0].equals("child")) {
+            childProcess();
+        }
+    }
+
+    private static void parentProcess() throws Throwable {
+        JDKToolLauncher launcher = JDKToolLauncher
+                .createUsingTestJDK("java")
+                .addToolArg("MultiDead")
+                .addToolArg("child");
+        ProcessBuilder pb = new ProcessBuilder(launcher.getCommand());
+
+        AtomicReference<Process> child = new AtomicReference<>();
+        AtomicBoolean stopFlag = new AtomicBoolean(false);
+
+        Thread th = new Thread(() -> {
+            for (int i = 0; i < CHILDREN_COUNT; ++i) {
+                System.out.println("child #" + (i + 1) + " of " +
+                        CHILDREN_COUNT);
+                try {
+                    child.set(pb.start());
+                    child.get().waitFor();
+                    if (stopFlag.get()) {
+                        break;
+                    }
+                } catch (Exception e) {
+                    throw new RuntimeException(e);
+                }
+            }
+        });
+
+        th.start();
+        th.join(CHILDREN_COUNT * 1000); // 1 sec for a child to complete
+        stopFlag.set(true);
+        if (th.isAlive()) {
+            if (child.get() != null) {
+                child.get().destroyForcibly();
+            }
+            throw new RuntimeException("Failed to complete on time.");
+        }
+    }
+
+    private static void childProcess() {
+        CountDownLatch latch = new CountDownLatch(1);
+        for (int i = 0; i < THREAD_PAIR_COUNT; ++i) {
+            new Thread(() -> {
+                try {
+                    latch.await();
+                    try (MulticastSocket a = new MulticastSocket(6000)) {
+                    }
+                } catch (Exception ignore) {
+                }
+            }).start();
+
+            new Thread(() -> {
+                try {
+                    latch.await();
+                    try (DatagramSocket b = new DatagramSocket(6000)) {
+                    }
+                } catch (Exception ignore) {
+                }
+            }).start();
+        }
+        latch.countDown();
+    }
+}