java application cannot bind to IPv6 socket on dual stack machines, if IPv4 socket is already bound

Java application cannot bind to IPv6 socket on dual stack machines, if IPv4
socket is already bound and setReuseAddress is "false".

The problem is strictly reproducible.

1. Precondition
---------------
 Please make sure that you are on a dual stack machine and inet6 interface
 is up:
% ifconfig -a
lo0: flags=1000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4> mtu 8232 index 1
        inet 127.0.0.1 netmask ff000000
eri0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
        inet 129.157.133.192 netmask ffffff00 broadcast 129.157.133.255
eri0: flags=2000841<UP,RUNNING,MULTICAST,IPv6> mtu 1500 index 2
        inet6 fe80::203:baff:fe5b:7e89/10

 If inet6 interface is not up, use:
# ifconfig eri0 inet6 plumb up


2. Testcase
-----------
 The testcase consists of a C program "v4serv.c" creating and binding to
 an IPv4 socket, and a Java program "NoReuse.java" creating and binding to
 an IPv6 socket (per default).

% more v4serv.c
#include <stdio.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <netdb.h>

main(int argc, char *argv[]) {

        struct sockaddr_in addr;
        int new_sock, sock;
        int yes=0;
        char buf[BUFSIZ];

        bzero(&addr, sizeof(addr));
        addr.sin_family = AF_INET;
        addr.sin_addr.s_addr = htonl(INADDR_ANY);
        addr.sin_port = htons(3300);

        if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
                perror("socket");
                return -1;
        }

        setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&yes, sizeof(int));
        if (bind(sock, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
                perror("bind");
                return -1;
        }

        listen(sock, 8);

        for(;;){
                new_sock = accept(sock, NULL, NULL);
                read(new_sock, buf, sizeof (buf));
                printf("%s", buf);
                close(new_sock);
        }

}
% more NoReuse.java
import java.net.*;
import java.io.*;

class NoReuse{

    public static String messages[]
      = {"test1", "test2", "test3" };

        public static void main(String args[]){

                try{

                        ServerSocket ss = new ServerSocket();
                        ss.setReuseAddress(false);
                        ss.bind( new InetSocketAddress(3300) );
                        Socket s = ss.accept();

            BufferedWriter writer
              = new BufferedWriter(
                  new OutputStreamWriter( s.getOutputStream() ) );
            for( int i=0; i<messages.length; i++ ) {
                 writer.write( messages[i], 0, messages[i].length() );
                 writer.newLine();
            }

                        writer.close();
                        s.close();

                }catch(UnknownHostException e){
                        System.out.println(e.toString());
                }catch(SocketException e){
                        System.out.println(e.toString());
                }catch(IOException e){
                        System.out.println(e.toString());
                }
        }
}
%


3. Make
-------
% /opt/SUNWspro/bin/cc -V v4serv.c -o v4serv -lsocket -lnsl
cc: Sun C 5.5 Patch 112760-11 2004/06/08
acomp: Sun C 5.5 Patch 112760-11 2004/06/08
"v4serv.c", line 7: warning: old-style declaration or incorrect type for: main
"v4serv.c", line 14: warning: implicit function declaration: bzero
"v4serv.c", line 34: warning: implicit function declaration: read
"v4serv.c", line 36: warning: implicit function declaration: close
ld: Software Generation Utilities - Solaris Link Editors: 5.9-1.343
% /j2sdk1.4.2_07/bin/javac NoReuse.java
%


4. Run w/ setReuseAddress(false)
--------------------------------
4.1 First "v4serv" then "NoReuse"
---------------------------------
% netstat -a | grep 3300
% ./v4serv &
[1] 16398
% netstat -a | grep 3300
      *.3300 *.* 0 0 49152 0 LISTEN
% /j2sdk1.4.2_07/bin/java NoReuse
java.net.BindException: Address already in use
%
 Does not work.

4.2 First "NoReuse" then "v4serv"
---------------------------------
% netstat -a | grep 3300
% /j2sdk1.4.2_07/bin/java NoReuse &
[1] 16410
% netstat -a | grep 3300
      *.3300 *.* 0 0 49152 0 LISTEN
      *.3300 *.* 0 0 49152 0 LISTEN
% ./v4serv
% bind: Address already in use
%
 Does not work.


5. Run w/ setReuseAddress(true)
-------------------------------
 change line 14 in NoReuse.java:
    14 ss.setReuseAddress(true);
5.1 First "v4serv" then "NoReuse"
---------------------------------
% netstat -a | grep 3300
% ./v4serv &
[1] 16438
% netstat -a | grep 3300
      *.3300 *.* 0 0 49152 0 LISTEN
% /net/redback/data/j2sdk1.4.2_07/bin/java NoReuse &
[2] 16441
% netstat -a | grep 3300
      *.3300 *.* 0 0 49152 0 LISTEN
      *.3300 *.* 0 0 49152 0 LISTEN
      *.3300 *.* 0 0 49152 0 LISTEN
%
 Everything fine here.

5.2 First "NoReuse" then "v4serv"
---------------------------------
% netstat -a | grep 3300
% /j2sdk1.4.2_07/bin/java NoReuse &
[1] 16450
% netstat -a | grep 3300
      *.3300 *.* 0 0 49152 0 LISTEN
      *.3300 *.* 0 0 49152 0 LISTEN
% ./v4serv &
[2] 16453
% netstat -a | grep 3300
      *.3300 *.* 0 0 49152 0 LISTEN
      *.3300 *.* 0 0 49152 0 LISTEN
      *.3300 *.* 0 0 49152 0 LISTEN
%
 Everything fine here.

###@###.### 2005-03-22 14:30:27 GMT