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Date: Wed, 28 Oct 1998 23:35:56 -0800
From: Mahadevan Iyer <iyer@internetdevices.com>
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To: java-port@FreeBSD.ORG, freebsd-java@FreeBSD.ORG,
saurabh@internetdevices.com, iyer@internetdevices.com,
namit@internetdevices.com
Subject: Possible Bug in JVM socket code on FreeBSD, java.net.Socket
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I have a simple Server and Client pair
Server listens for connections on fixed port
Clients connect to the server on the port
The Client opens N connections to the server and keeps them open
The Server sends data on each of these connections
The Client listens for data on each of these connections in a single
thread
N > 250 causes the Client to dump core
java -version
java version "1.1.6"
I do get this warning when I try to run the interpreter
/usr/libexec/ld.so: warning: /usr/lib/libc.so.3.0: minor
version 0 older than expected 1, using it anyway
/usr/libexec/ld.so: warning: /usr/lib/libc.so.3.0: minor
version 0 older than expected 1, using it anyway
Is this related to the problem described above
FreeBSD Version
> uname -a
FreeBSD fbsd.abhiweb.com 2.2-STABLE FreeBSD 2.2-STABLE #0: Fri
Aug 15 08:06:41
------------------
Connection # : 249
Connection # : 250
SIGSEGV 11* segmentation violation
Full thread dump:
"Finalizer thread" (TID:0x8414208, sys_thread_t:0x9218efc, state:CW)
prio=1
"Async Garbage Collector" (TID:0x8414250, sys_thread_t:0x91f7efc,
state:R) prio=1
"Idle thread" (TID:0x8414298, sys_thread_t:0x91d6efc, state:R)
prio=0
"Clock" (TID:0x8414088, sys_thread_t:0x91b5efc, state:CW) prio=12
"main" (TID:0x84140b0, sys_thread_t:0x4e00, state:R) prio=5 *current
thread*
java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:290)
java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:132)
java.net.PlainSocketImpl.connect(PlainSocketImpl.java:119)
java.net.Socket.<init>(Socket.java:229)
java.net.Socket.<init>(Socket.java:97)
TClient.<init>(TClient.java:19)
TClient.main(TClient.java:68)
Monitor Cache Dump:
<unknown key> (0x91f7efc): owner "Async Garbage Collector"
(0x91f7efc, 1 entry)
Registered Monitor Dump:
Thread queue lock: <unowned>
Name and type hash table lock: <unowned>
String intern lock: <unowned>
JNI pinning lock: <unowned>
JNI global reference lock: <unowned>
BinClass lock: <unowned>
Class loading lock: <unowned>
Java stack lock: <unowned>
Code rewrite lock: <unowned>
Heap lock: <unowned>
Has finalization queue lock: <unowned>
Finalize me queue lock: <unowned>
Waiting to be notified:
"Finalizer thread" (0x9218efc)
Monitor IO lock: <unowned>
Child death monitor: <unowned>
Event monitor: <unowned>
I/O monitor: <unowned>
Alarm monitor: <unowned>
Waiting to be notified:
"Clock" (0x91b5efc)
_malloc: <unowned>
Monitor registry: owner "main" (0x4e00, 1 entry)
Thread Alarm Q:
Abort trap (core dumped)
-----------------------------
I have included the 2 files TServer.java and TClient.java
To reproduce
compile java files using jdk1.1.6
su to root so that you can open at least 1024 connections
cd to directory with TServer.class and TClient.class
Server
JAVA1.1.6HOME/bin/java TServer 5000
Client
JAVA1.1.6HOME/bin/java TClient 1000
--------------AC16728A372C0B33E606B4E6
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit
<HTML>
I have a simple Server and Client pair
<BR>Server listens for connections on fixed port
<BR>Clients connect to the server on the port
<P>The Client opens N connections to the server and keeps them open
<BR>The Server sends data on each of these connections
<BR>The Client listens for data on each of these connections in a single
thread
<P>N > 250 causes the Client to dump core
<P>java -version
<BLOCKQUOTE>java version "1.1.6"</BLOCKQUOTE>
I do get this warning when I try to run the interpreter
<BLOCKQUOTE>/usr/libexec/ld.so: warning: /usr/lib/libc.so.3.0: minor version
0 older than expected 1, using it anyway
<BR>/usr/libexec/ld.so: warning: /usr/lib/libc.so.3.0: minor version 0
older than expected 1, using it anyway
<P>Is this related to the problem described above</BLOCKQUOTE>
<P>FreeBSD Version
<BLOCKQUOTE>> uname -a
<BR>FreeBSD fbsd.abhiweb.com 2.2-STABLE FreeBSD 2.2-STABLE #0: Fri Aug
15 08:06:41</BLOCKQUOTE>
------------------
<P>Connection # : 249
<BR>Connection # : 250
<BR>SIGSEGV 11* segmentation violation
<P>Full thread dump:
<BR> "Finalizer thread" (TID:0x8414208, sys_thread_t:0x9218efc,
state:CW) prio=1
<BR> "Async Garbage Collector" (TID:0x8414250, sys_thread_t:0x91f7efc,
state:R) prio=1
<BR> "Idle thread" (TID:0x8414298, sys_thread_t:0x91d6efc,
state:R) prio=0
<BR> "Clock" (TID:0x8414088, sys_thread_t:0x91b5efc,
state:CW) prio=12
<BR> "main" (TID:0x84140b0, sys_thread_t:0x4e00, state:R)
prio=5 *current thread*
<BR> java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:290)
<BR> java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:132)
<BR> java.net.PlainSocketImpl.connect(PlainSocketImpl.java:119)
<BR> java.net.Socket.<init>(Socket.java:229)
<BR> java.net.Socket.<init>(Socket.java:97)
<BR> TClient.<init>(TClient.java:19)
<BR> TClient.main(TClient.java:68)
<BR>Monitor Cache Dump:
<BR> <unknown key> (0x91f7efc): owner "Async Garbage
Collector" (0x91f7efc, 1 entry)
<BR>Registered Monitor Dump:
<BR> Thread queue lock: <unowned>
<BR> Name and type hash table lock: <unowned>
<BR> String intern lock: <unowned>
<BR> JNI pinning lock: <unowned>
<BR> JNI global reference lock: <unowned>
<BR> BinClass lock: <unowned>
<BR> Class loading lock: <unowned>
<BR> Java stack lock: <unowned>
<BR> Code rewrite lock: <unowned>
<BR> Heap lock: <unowned>
<BR> Has finalization queue lock: <unowned>
<BR> Finalize me queue lock: <unowned>
<BR> Waiting to be notified:
<BR> "Finalizer thread" (0x9218efc)
<BR> Monitor IO lock: <unowned>
<BR> Child death monitor: <unowned>
<BR> Event monitor: <unowned>
<BR> I/O monitor: <unowned>
<BR> Alarm monitor: <unowned>
<BR> Waiting to be notified:
<BR> "Clock" (0x91b5efc)
<BR> _malloc: <unowned>
<BR> Monitor registry: owner "main" (0x4e00, 1 entry)
<BR>Thread Alarm Q:
<BR>Abort trap (core dumped)
<P>-----------------------------
<P>I have included the 2 files TServer.java and TClient.java
<P>To reproduce
<BLOCKQUOTE>compile java files using jdk1.1.6</BLOCKQUOTE>
<BLOCKQUOTE>su to root so that you can open at least 1024 connections</BLOCKQUOTE>
<BLOCKQUOTE>cd to directory with TServer.class and TClient.class</BLOCKQUOTE>
Server
<BLOCKQUOTE>JAVA1.1.6HOME/bin/java TServer 5000</BLOCKQUOTE>
Client
<BLOCKQUOTE>JAVA1.1.6HOME/bin/java TClient 1000</BLOCKQUOTE>
</HTML>
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Content-Type: text/plain; charset=us-ascii; name="TServer.java"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="TServer.java"
import java.net.*;
import java.io.*;
import java.util.*;
class DataThread extends Thread {
Vector _connections;
public DataThread(Vector connections) {
_connections = connections;
}
public void run() {
int i = 0;
String[] message = {
"Hello",
"how",
"are",
"you"
};
while(true) {
i++;
try {
Thread.sleep(100);
if(_connections.isEmpty())
continue;
int index = i % _connections.size();
Socket s = (Socket)_connections.elementAt(index);
try {
s.getOutputStream().write(message[i % 4].getBytes());
}
catch(Exception e) {
System.out.println("Removing socket : " + String.valueOf(index));
_connections.removeElementAt(index);
}
System.out.print('.');
}
catch(Exception e) {
e.printStackTrace();
}
}
}
}
public class TServer {
ServerSocket _server;
Vector _clients;
public TServer(int port) throws Exception {
_server = new ServerSocket(port);
System.out.println("Listening on port : " + String.valueOf(port));
_clients = new Vector();
DataThread dt = new DataThread(_clients);
dt.start();
while(true) {
try {
Socket s = _server.accept();
_clients.addElement(s);
System.out.println("Accepted connection : " + String.valueOf(_clients.size()));
}
catch(Exception e) {
System.out.println("Error Accepting connection : " + String.valueOf(_clients.size()));
e.printStackTrace();
break;
}
}
}
public static void main(String[] args) throws Exception {
if(args.length == 0) {
System.out.println("Usage: java TServer <port>");
System.exit(1);
}
int port = Integer.parseInt(args[0]);
TServer server = new TServer(port);
}
}
--------------6512B0160517B8DDA22B1BB9
Content-Type: text/plain; charset=us-ascii; name="TClient.java"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="TClient.java"
import java.net.*;
import java.io.*;
import java.util.*;
public class TClient {
Vector _connections;
public TClient(String host, int port, int max) throws Exception {
_connections = new Vector();
System.out.println("Initializing TClient");
if(System.getProperty("DELAY") != null)
System.out.println("Using DELAY");
else
System.out.println("NOT Using DELAY");
long t1 = System.currentTimeMillis();
while(_connections.size() < max) {
try {
Socket s = new Socket(host, port);
System.out.println("Connection # : " + String.valueOf(_connections.size()));
_connections.addElement(s);
if(System.getProperty("DELAY") != null) {
System.out.println("DELAY");
Thread.sleep(10);
}
}
catch(Exception e) {
System.out.println("Error Connection # : " + String.valueOf(_connections.size()));
e.printStackTrace();
break;
}
}
long t2 = System.currentTimeMillis();
System.out.println("Average Connection time : " +
String.valueOf( (t2 - t1)/max));
}
public void poll() {
try {
while(true) {
for(int i = 0; i < _connections.size(); i++) {
Socket s = (Socket)(_connections.elementAt(i));
if(s.getInputStream().available() > 0) {
byte[] data = new byte[s.getInputStream().available()];
s.getInputStream().read(data);
String message = new String(data);
// System.out.print(String.valueOf(i) + " : " + message + "; ");
System.out.print(String.valueOf(i) + "; ");
}
}
Thread.sleep(100);
System.out.print('.');
}
}
catch(Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) throws Exception {
if(args.length < 3) {
System.out.println("Usage: java TClient <server> <port> <maxconnections>");
System.exit(1);
}
int port = Integer.parseInt(args[1]);
int max = Integer.parseInt(args[2]);
TClient client = new TClient(args[0], port, max);
client.poll();
}
}
--------------6512B0160517B8DDA22B1BB9--
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From owner-freebsd-java Thu Oct 29 08:22:02 1998
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From: Nate Williams <nate@mt.sri.com>
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To: Mahadevan Iyer <iyer@internetdevices.com>
Cc: java-port@FreeBSD.ORG, freebsd-java@FreeBSD.ORG,
saurabh@internetdevices.com, namit@internetdevices.com
Subject: Re: Possible Bug in JVM socket code on FreeBSD, java.net.Socket
In-Reply-To: <36381ADB.DCCDAB3D@internetdevices.com>
References: <36381ADB.DCCDAB3D@internetdevices.com>
X-Mailer: VM 6.34 under 19.16 "Lille" XEmacs Lucid
Sender: owner-freebsd-java@FreeBSD.ORG
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> I have a simple Server and Client pair
> Server listens for connections on fixed port
> Clients connect to the server on the port
>
> The Client opens N connections to the server and keeps them open
> The Server sends data on each of these connections
> The Client listens for data on each of these connections in a single
> thread
>
> N > 250 causes the Client to dump core
>
> java -version
>
> java version "1.1.6"
>
> I do get this warning when I try to run the interpreter
>
> /usr/libexec/ld.so: warning: /usr/lib/libc.so.3.0: minor
> version 0 older than expected 1, using it anyway
> /usr/libexec/ld.so: warning: /usr/lib/libc.so.3.0: minor
> version 0 older than expected 1, using it anyway
>
> Is this related to the problem described above
Probably not. FreeBSD 2.2.7 updated the library number, but it wouldn't
have affected Java.
Thanks for your test programs, I'll try them out and get back to you
soon.
Nate
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From owner-freebsd-java Thu Oct 29 09:05:55 1998
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From: Nate Williams <nate@mt.sri.com>
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To: Mahadevan Iyer <iyer@internetdevices.com>
Cc: java-port@FreeBSD.ORG, freebsd-java@FreeBSD.ORG,
saurabh@internetdevices.com, namit@internetdevices.com
Subject: Re: Possible Bug in JVM socket code on FreeBSD, java.net.Socket
In-Reply-To: <36381ADB.DCCDAB3D@internetdevices.com>
References: <36381ADB.DCCDAB3D@internetdevices.com>
X-Mailer: VM 6.34 under 19.16 "Lille" XEmacs Lucid
Sender: owner-freebsd-java@FreeBSD.ORG
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> I have a simple Server and Client pair
> Server listens for connections on fixed port
> Clients connect to the server on the port
>
> The Client opens N connections to the server and keeps them open
> The Server sends data on each of these connections
> The Client listens for data on each of these connections in a single
> thread
>
> N > 250 causes the Client to dump core
I can verify that this bug does indeed exist in the FreeBSD JDK.
However, I do not (yet) have any idea why. It's happening inside the OS
dependant socket code, but I haven't yet figured out why.
*IF* I run the program with 'java_g -t' (tracing), it works with more
connections, but that changes the timing quite a bit (it's ALOT slower)
and can possibly be using different compiler optimization which might
cause the program to act differently.
I'll keep looking into it, since this behavior is critical to the
success of my product.
Ahh, I just tested with a larger value, and it blows up. Unfortunately,
it doesn't tell me why it's dying, since it appears that it might be
dying in the call itself. :(
More later.
Nate
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From owner-freebsd-java Fri Oct 30 11:00:21 1998
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From: Rogerio Gatto <gatto@widesoft.com.br>
To: freebsd-java@FreeBSD.ORG
Subject: JIT on FreeBSD
Date: Fri, 30 Oct 1998 16:59:41 -0200
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Hi,
Does anyone know where I can find a JIT for JDK1.1.6 (or tell me there
isn't one yet...)?
Thanx in advance.
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To: Rogerio Gatto <gatto@widesoft.com.br>
Cc: freebsd-java@FreeBSD.ORG
Subject: Re: JIT on FreeBSD
In-Reply-To: <BBE7F889EE27D211BB1A00A0C9AC2B8309FEE1@calcio.widesoft.com.br>
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> Does anyone know where I can find a JIT for JDK1.1.6 (or tell me there
> isn't one yet...)?
There isn't one for unix.
Nate
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From owner-freebsd-java Sat Oct 31 06:49:53 1998
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From: Adam Barber <abarber@nimbus.skycache.com>
To: java@FreeBSD.ORG
Subject: sparc
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Is there a version of JDK or JRE that will work on a sparc 10 running
NetBSD or Freebsd? If you could please point me in the correct direction
I would greatly appreciate it.
Thank you,
Adam Barber
Skycache, Inc.
Network Operations Engineer
abarber@skycache.com
"No! Try not. Do, or do not. There is no try."
-Yoda
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From owner-freebsd-java Sat Oct 31 09:41:13 1998
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To: Adam Barber <abarber@nimbus.skycache.com>
Cc: java@FreeBSD.ORG
Subject: Re: sparc
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> Is there a version of JDK or JRE that will work on a sparc 10 running
> NetBSD or Freebsd?
Since there is no port of FreeBSD for the Sparc, there is no version of
Java that would run on it. You might want to check the other *BSD's for
a version of the JDK for the Sparc. (I know that NetBSD has a JDK for
some releases, so they would be the most likely candidate...)
Nate
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