Construction of a new ServerSocket taking abnormally long - ipv6-related

Question

SUMMARY
It takes 180+ seconds to open a ServerSocket if IPv6 is present on the loopback device.
SYSTEM
Debian unstable
Linux desktop3.mgn 2.4.27-speakup #1 Fri Feb 25 15:43:38 EST 2005 i686 GNU/Linux
java version "1.4.2_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_06-b03)
Java HotSpot(TM) Client VM (build 1.4.2_06-b03, mixed mode)
MORE INFO
Last place within PlainSocketImpl everything's alright is     /**
     * Load net library into runtime.
    static {
     java.security.AccessController.doPrivileged(
            new sun.security.action.LoadLibraryAction("net"));
     initProto();
    }After the call to initProto (which is a native method) it takes 180+ seconds for the last connect() call below (got i from running strace) to timeout:socket(PF_INET6, SOCK_STREAM, IPPROTO_IP) = 5
listen(5, 1)                            = 0
getsockname(5, {sa_family=AF_INET6, sin6_port=htons(37753), inet_pton(AF_INET6, "::", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, [28]) = 0
socket(PF_INET6, SOCK_STREAM, IPPROTO_IP) = 6
connect(6, {sa_family=AF_INET6, sin6_port=htons(37753), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=3221214872}, 24) = -1 ETIMEDOUT (Connection timed out)TEST PROGRAMimport java.net.*;
public class Test {
     public static void main(String[] args) {
          try {
               long start = System.currentTimeMillis();
               ServerSocket serverSocket = new ServerSocket(4445);  // <-- this is what takes abnormally long
               long stop = System.currentTimeMillis();
               System.out.println("stop - start = " + (stop - start));
          } catch (UnknownHostException e) {
               e.printStackTrace();
               System.exit(-1);
          } catch (java.io.IOException e) {
               e.printStackTrace();
               System.exit(-2);
}CASE "ON"# ip a show dev lo
1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
$ java Test
stop - start = 189011CASE "OFF"# ip a del ::1/128 dev lo
# ip a show dev lo
1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
$ java Test
stop - start = 18Commands executed to "turn ipv6 on/off":ip a del ::1/128 dev lo
ip a add ::1/128 dev loNo other programs show this delay. Is this a bug?

Answer 1

I think so, I've read something like that in BugParade.
Try Java5 or Java6 (Mustang) with your code.
--Marc