java.net.ServerSocket fails with core

Name: dfC67450 Date: 05/11/99



java.net.ServerSocket fails with core after being in idle state during
more than 15 minutes. Idle state is the state when no clients are connected
to this server. For work with new connection server creates new thread which
writes into outputstream "Hi Amigo" and prints everything from inputstream.

Example of client in Client.java.
It connects to server, reads something from server and writes "Hello".
Then client disconnects. To run client you should pass to it 2 parameters:
host name and port number.

To reproduce the bug do the following:

1. run server for example on 'spb' with command: java Server
2. run client in another console with command: java Client spb 0xfda0
3. wait for 15 minutes
4. repeat #2, server will fail with core.


-----------------Server.java------------------------
import java.net.ServerSocket;
import java.net.Socket;
import java.net.InetAddress;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class Server extends ServerSocket {

    public int port = 0;

    public static void main (String args[]) {
        try {
            Server server = new Server(0xFDA0);
            server.go();
        } catch (IOException e) {
            System.out.println("Error of server initialization: " + e);
        }
        return;
    }

    public Server(int port) throws IOException {
        super(port);
        this.port = getLocalPort();
        System.out.println("--- port: " + this.port + " ---");
    }

    public void go() {
        while (true) {
            try {
                Socket sock = accept();
                Dialog d = new Dialog(this, sock);
                System.out.println(" -- address: " + sock.getInetAddress());
                d.start();
            } catch (IOException e) {
                System.out.println("unexpected ): " + e);
            }
        }
    }
}

class Dialog extends Thread {

    Socket socket = null;
    Server server = null;
    InputStream in = null;
    OutputStream out = null;


    public Dialog (Server server,
                   Socket sock) throws IOException {
        this.server = server;
        this.socket = sock;
        try {
            in = socket.getInputStream();
            out = socket.getOutputStream();
        } catch (IOException e) {
            throw new IOException("error with open stream: " + e.toString());
        }
    }
    
    public void run() {
        System.out.println("== new client connected == ");
        try {
            out.write("Hi Amigo".getBytes());
            int len = 0;
            while (len >= 0) {
                byte[] bytes = new byte[80];
                len = in.read(bytes);
                if (len > 0) System.out.println(new String(bytes, 0, len));
            }
            in.close();
            out.close();
        } catch (IOException e) {
            System.out.println("Thread thrown an exception " + e);
            System.out.println("And will be interrupted");
            e.printStackTrace(System.out);
        }
        System.out.println("== client disconnected == ");

    }
}

-----------------Client.java------------------------
import java.net.ServerSocket;
import java.net.Socket;
import java.net.InetAddress;
import java.net.MalformedURLException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class Client {
    public int port = 0;
    public String host = null;
    OutputStream out = null;
    InputStream in = null;

    String name = null;

    public static void main (String args[]){
        String host = args[0];
        int port = Integer.decode(args[1]).intValue();
        Client client = new Client(host, port);
        client.go();
    }

    public Client(String host, int port) {
        this.host = host;
        this.port = port;
    }

    public void go() {
        try {
            Socket sock = new Socket(host, port);
            out = sock.getOutputStream();
            in = sock.getInputStream();
            byte[] bytes = new byte[80];
            int len = in.read(bytes);
            if (len > 0)
                System.out.println("received: " + new String(bytes, 0, len));
            out.write("Hello".getBytes());
        } catch (Exception e) {
             System.out.println("exception: " + e);
        }
        
    }
}

---------Output of Server ---------------------
<spb> showrev -p
Patch: 103630-13 Obsoletes: Packages: SUNWcsu, SUNWcsr
Patch: 103663-14 Obsoletes: 103683-01 Packages: SUNWcsu, SUNWcsr, SUNWhea
Patch: 103582-18 Obsoletes: Packages: SUNWcsu, SUNWcsr
Patch: 103594-16 Obsoletes: 105520-01 Packages: SUNWcsu, SUNWcsr, SUNWnisu
Patch: 103603-09 Obsoletes: Packages: SUNWcsu
Patch: 103612-46 Obsoletes: 103615-04, 103654-01 Packages: SUNWcsu, SUNWcsr, SUNWarc, SUNWscpu, SUNWfns, SUNWnisu, SUNWsra, SUNWsutl
Patch: 103622-12 Obsoletes: Packages: SUNWcsu, SUNWcsr, SUNWhea
Patch: 103627-05 Obsoletes: 103606-02, 105069-01 Packages: SUNWcsu, SUNWcsr, SUNWarc, SUNWbtool, SUNWhea, SUNWtoo, SUNWxcu4
Patch: 103640-23 Obsoletes: 103591-09, 103658-02, 103920-05, 103600-18, 103609-02 Packages: SUNWcsu, SUNWcsr, SUNWkvm, SUNWcar, SUNWhea
Patch: 103680-02 Obsoletes: Packages: SUNWcsu
Patch: 103690-06 Obsoletes: Packages: SUNWcsu
Patch: 103696-04 Obsoletes: Packages: SUNWcsu, SUNWcsr
Patch: 103699-02 Obsoletes: Packages: SUNWcsu
Patch: 103817-02 Obsoletes: Packages: SUNWcsu
Patch: 103934-08 Obsoletes: Packages: SUNWcsu, SUNWcsr, SUNWhea
Patch: 104166-03 Obsoletes: Packages: SUNWcsu
Patch: 104220-03 Obsoletes: Packages: SUNWcsu
Patch: 104266-01 Obsoletes: Packages: SUNWcsu
Patch: 104317-01 Obsoletes: Packages: SUNWcsu
Patch: 104331-07 Obsoletes: Packages: SUNWcsu
Patch: 104433-07 Obsoletes: Packages: SUNWcsu, SUNWcsr
Patch: 104490-05 Obsoletes: 103847-02 Packages: SUNWcsu
Patch: 104334-01 Obsoletes: Packages: SUNWcsu
Patch: 104613-01 Obsoletes: Packages: SUNWcsu
Patch: 104650-02 Obsoletes: Packages: SUNWcsu
Patch: 104654-05 Obsoletes: Packages: SUNWcsu
Patch: 104692-01 Obsoletes: Packages: SUNWcsu
Patch: 104708-14 Obsoletes: 104710-01, 103766-02 Packages: SUNWcsu, SUNWhea, SUNWssadv, SUNWssaop
Patch: 104736-04 Obsoletes: Packages: SUNWcsu
Patch: 104776-02 Obsoletes: Packages: SUNWcsu, SUNWarc
Patch: 104935-01 Obsoletes: Packages: SUNWcsu
Patch: 103738-08 Obsoletes: Packages: SUNWcsu
Patch: 104956-04 Obsoletes: Packages: SUNWcsu
Patch: 104958-01 Obsoletes: Packages: SUNWcsu
Patch: 104960-01 Obsoletes: Packages: SUNWcsu
Patch: 104968-02 Obsoletes: Packages: SUNWcsu
Patch: 105050-01 Obsoletes: Packages: SUNWcsu, SUNWscpu
Patch: 105092-01 Obsoletes: Packages: SUNWcsu
Patch: 105784-02 Obsoletes: Packages: SUNWcsu, SUNWarc
Patch: 103981-14 Obsoletes: Packages: SUNWcsu, SUNWcsr
Patch: 103597-04 Obsoletes: Packages: SUNWcsr
Patch: 104283-04 Obsoletes: Packages: SUNWcsr
Patch: 104560-05 Obsoletes: Packages: SUNWcsr
Patch: 104893-01 Obsoletes: Packages: SUNWcsr
Patch: 105004-10 Obsoletes: 104604-04 Packages: SUNWcsr, SUNWcar, SUNWhea
Patch: 105299-01 Obsoletes: Packages: SUNWcsr
Patch: 105352-01 Obsoletes: Packages: SUNWcsr
Patch: 104795-02 Obsoletes: Packages: SUNWkvm
Patch: 104595-06 Obsoletes: Packages: SUNWkvm
Patch: 104489-08 Obsoletes: Packages: SUNWtltk, SUNWtltkd
Patch: 103566-36 Obsoletes: 103508-01 Packages: SUNWxwfnt, SUNWxwplt, SUNWxwopt, SUNWxwslb
Patch: 104338-02 Obsoletes: Packages: SUNWxwplt, SUNWxwslb
Patch: 104010-01 Obsoletes: Packages: SUNWvolu
Patch: 104841-03 Obsoletes: Packages: SUNWvolu
Patch: 106382-01 Obsoletes: Packages: SUNWvolu
Patch: 103901-11 Obsoletes: Packages: SUNWolrte, SUNWolinc, SUNWolslb
Patch: 104533-04 Obsoletes: Packages: SUNWolrte, SUNWolslb
Patch: 104976-03 Obsoletes: Packages: SUNWoldcv, SUNWoldst
Patch: 103461-27 Obsoletes: Packages: SUNWmfrun
Patch: 103558-12 Obsoletes: Packages: SUNWadmap, SUNWadmc, SUNWsadml
Patch: 106224-01 Obsoletes: Packages: SUNWoldst
Patch: 103879-04 Obsoletes: Packages: SUNWkcsrt
Patch: 104516-03 Obsoletes: Packages: SUNWapppu
Patch: 103959-08 Obsoletes: Packages: SUNWscpu, SUNWlpr, SUNWlpu, SUNWlps
Patch: 103866-05 Obsoletes: Packages: SUNWbcp
Patch: 103743-01 Obsoletes: Packages: SUNWfns
Patch: 104605-08 Obsoletes: Packages: SUNWhea
Patch: 103686-02 Obsoletes: Packages: SUNWnisu
Patch: 105344-01 Obsoletes: Packages: SUNWtoo
Patch: 103900-01 Obsoletes: Packages: SUNWowbcp
Patch: 105251-01 Obsoletes: Packages: SUNWowbcp
Patch: 105789-02 Obsoletes: 103796-19 Packages: SUNWvlxil
Patch: 103801-07 Obsoletes: Packages: SUNWsprot, SUNWxcu4t

<spb> showrev -p |grep -c Patch
73

<spb> uname -a
SunOS spb 5.5.1 Generic_103640-23 sun4u sparc SUNW,Ultra-1

<spb> java -version
java version "1.3"
Classic VM (build JDK-1.3-C, green threads, sunwjit)

<spb> java Server
--- port: 64928 ---
 -- address: spb.sparc.spb.su/192.168.205.170
== new client connected ==
Hello
== client disconnected ==
SIGSEGV 11* segmentation violation
    si_signo [11]: SIGSEGV 11* segmentation violation
    si_errno [0]: Error 0
    si_code [1]: SEGV_MAPERR [addr: 0xFA066014]
 
        stackpointer=efffe8f8
 
Full thread dump Classic VM (JDK-1.3-C, green threads):
    "Finalizer" (TID:0xebc98308, sys_thread_t:0x61500, state:CW) prio=8
        at java.lang.Object.wait(Native Method)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:112)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:127)
        at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:174)
    "Reference Handler" (TID:0xebc98398, sys_thread_t:0x5dd98, state:CW) prio=10
        at java.lang.Object.wait(Native Method)
        at java.lang.Object.wait(Object.java:424)
        at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:114)
    "Signal dispatcher" (TID:0xebc983c8, sys_thread_t:0x582b8, state:CW) prio=5
    "main" (TID:0xebc981c8, sys_thread_t:0x26810, state:R) prio=5
        at Server.go(Server.java, Compiled Code)
        at Server.main(Server.java, Compiled Code)
Monitor Cache Dump:
    java.lang.ref.ReferenceQueue$Lock@EBC98320/EBCCE028: <unowned>
        Waiting to be notified:
            "Finalizer" (0x61500)
    java.lang.Class@EBCBF570/EBD913A8: owner "main" (0x26810) 1 entry
    sun.misc.Launcher$AppClassLoader@EBC993F0/EBCE05E8: owner "main" (0x26810) 1 entry
    java.lang.ref.Reference$Lock@EBC983A8/EBCCDB20: <unowned>
        Waiting to be notified:
            "Reference Handler" (0x5dd98)
Registered Monitor Dump:
    PCMap lock: <unowned>
    utf8 hash table: <unowned>
    JNI pinning lock: <unowned>
    JNI global reference lock: <unowned>
    BinClass lock: <unowned>
    Class linking lock: <unowned>
    System class loader lock: <unowned>
    Code rewrite lock: <unowned>
    Heap lock: <unowned>
    Monitor cache lock: owner "main" (0x26810) 1 entry
    Dynamic loading lock: <unowned>
    Monitor IO lock: <unowned>
    User signal monitor: <unowned>
        Waiting to be notified:
            "Signal dispatcher" (0x582b8)
    Child death monitor: <unowned>
    I/O monitor: <unowned>
    Alarm monitor: <unowned>
        Waiting to be notified:
            <unknown thread> (0x2bb00)
    Thread queue lock: owner "main" (0x26810) 1 entry
    Monitor registry: owner "main" (0x26810) 1 entry
 
SIGABRT 6* abort (generated by abort(3) routine)
    si_signo [6]: SIGABRT 6* abort (generated by abort(3) routine)
    si_errno [0]: Error 0
    si_code [0]: SI_USER [pid: 18489, uid: 314]
        stackpointer=efffe8f8
 
Full thread dump Classic VM (JDK-1.3-C, green threads):
    "Finalizer" (TID:0xebc98308, sys_thread_t:0x61500, state:CW) prio=8
        at java.lang.Object.wait(Native Method)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:112)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:127)
        at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:174)
    "Reference Handler" (TID:0xebc98398, sys_thread_t:0x5dd98, state:CW) prio=10
        at java.lang.Object.wait(Native Method)
        at java.lang.Object.wait(Object.java:424)
        at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:114)
    "Signal dispatcher" (TID:0xebc983c8, sys_thread_t:0x582b8, state:CW) prio=5
    "main" (TID:0xebc981c8, sys_thread_t:0x26810, state:R) prio=5
        at Server.go(Server.java, Compiled Code)
        at Server.main(Server.java, Compiled Code)
Monitor Cache Dump:
    java.lang.ref.ReferenceQueue$Lock@EBC98320/EBCCE028: <unowned>
        Waiting to be notified:
            "Finalizer" (0x61500)
    java.lang.Class@EBCBF570/EBD913A8: owner "main" (0x26810) 1 entry
    sun.misc.Launcher$AppClassLoader@EBC993F0/EBCE05E8: owner "main" (0x26810) 1 entry
    java.lang.ref.Reference$Lock@EBC983A8/EBCCDB20: <unowned>
        Waiting to be notified:
            "Reference Handler" (0x5dd98)
Registered Monitor Dump:
    PCMap lock: <unowned>
    utf8 hash table: <unowned>
    JNI pinning lock: <unowned>
    JNI global reference lock: <unowned>
    BinClass lock: <unowned>
    Class linking lock: <unowned>
    System class loader lock: <unowned>
    Code rewrite lock: <unowned>
    Heap lock: <unowned>
    Monitor cache lock: owner "main" (0x26810) 1 entry
    Dynamic loading lock: <unowned>
    Monitor IO lock: <unowned>
    User signal monitor: <unowned>
        Waiting to be notified:
            "Signal dispatcher" (0x582b8)
    Child death monitor: <unowned>
    I/O monitor: <unowned>
    Alarm monitor: <unowned>
        Waiting to be notified:
            <unknown thread> (0x2bb00)
    Thread queue lock: owner "main" (0x26810) 1 entry
    Monitor registry: owner "main" (0x26810) 1 entry


--------- Output of Client ---------------------
<spb> java Client spb 0xfda0
received: Hi Amigo

<spb> java Client spb 0xfda0

<spb>
--------------------------------------------------

======================================================================