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Bug ID: JDK-6372405 Server thread hangs when fragments don't complete because of connection abort
JDK-6372405 : Server thread hangs when fragments don't complete because of connection abort

Details
Type:
Bug
Submit Date:
2006-01-13
Status:
Resolved
Updated Date:
2010-07-29
Project Name:
JDK
Resolved Date:
2008-07-28
Component:
other-libs
OS:
windows_xp
Sub-Component:
corba:orb
CPU:
generic
Priority:
P4
Resolution:
Fixed
Affected Versions:
1.4.2_10
Fixed Versions:
5.0u16-rev (b05)

Related Reports
Backport:
Backport:
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Relates:

Sub Tasks

Description
Bug has been filed as well through (Review ID: 624057)
When a client crashes or loses its connection while a fragmented call is in
progress, the receiving server thread gets stuck. This wastes a thread on
the server side, and keeps the ORB from shutting down cleanly.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. compile the source provided below
2. In one terminal, run
java com.coremedia.corba.DefragHang
3. copy the IOR that is printed in terminal 1. In a second terminal, run
java com.coremedia.corba.DefragHang <theIORthatWasPrinted> -x 4. In terminal
1, press return  (to shutdown the server)


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The output I expect in terminal 1 is:
press any key to shut down...
incoming call...
...call handled
shutting down...
shut down.

ACTUAL -
press any key to shut down...
incoming call...
shutting down...


ERROR MESSAGES/STACK TRACES THAT OCCUR :
for Java 1.5:

"p: default-threadpool; w: 0" daemon prio=5 tid=0x0acc0c60 nid=0x1d08 in
Object.wait() [0x0af0f000..0x0af0fd68]
        at java.lang.Object.wait(Native Method)
        - waiting on <0x02b39f28> (a
com.sun.corba.se.impl.encoding.BufferQueue)
        at java.lang.Object.wait(Object.java:474)
        at
com.sun.corba.se.impl.encoding.BufferManagerReadStream.underflow(BufferManag
erReadStream.java:97)
        - locked <0x02b39f28> (a com.sun.corba.se.impl.encoding.BufferQueue)
        at
com.sun.corba.se.impl.encoding.CDRInputStream_1_1.grow(CDRInputStream_1_1.ja
va:75)
        at
com.sun.corba.se.impl.encoding.CDRInputStream_1_0.read_octet_array(CDRInputS
tream_1_0.java:684)
        at
com.sun.corba.se.impl.encoding.CDRInputStream.read_octet_array(CDRInputStrea
m.java:177)
        at
com.coremedia.corba.DefragHang$MyServant._invoke(DefragHang.java:68)
        at
com.sun.corba.se.impl.protocol.CorbaServerRequestDispatcherImpl.dispatchToSe
rvant(CorbaServerRequestDispatcherImpl.java:637)
        at
com.sun.corba.se.impl.protocol.CorbaServerRequestDispatcherImpl.dispatch(Cor
baServerRequestDispatcherImpl.java:189)
        at
com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleRequestRequest
(CorbaMessageMediatorImpl.java:1680)
        at
com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaM
essageMediatorImpl.java:1540)
        at
com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleInput(CorbaMes
sageMediatorImpl.java:922)
        at
com.sun.corba.se.impl.protocol.giopmsgheaders.RequestMessage_1_2.callback(Re
questMessage_1_2.java:181)
        at
com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaM
essageMediatorImpl.java:694)
        at
com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.dispatch(Socke
tOrChannelConnectionImpl.java:451)
        at
com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.doWork(SocketO
rChannelConnectionImpl.java:1187)
        at
com.sun.corba.se.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(Thr
eadPoolImpl.java:417)


for Java 1.4:

"RequestProcessor[0]" daemon prio=5 tid=0x00a66740 nid=0x17d8 in
Object.wait() [2f5f000..2f5fd8c]
        at java.lang.Object.wait(Native Method)
        - waiting on <0x1007c068> (a
com.sun.corba.se.internal.iiop.BufferQueue)
        at java.lang.Object.wait(Object.java:429)
        at
com.sun.corba.se.internal.iiop.BufferManagerReadStream.underflow(BufferManag
erReadStream.java:62)
        - locked <0x1007c068> (a com.sun.corba.se.internal.iiop.BufferQueue)
        at
com.sun.corba.se.internal.iiop.CDRInputStream_1_1.grow(CDRInputStream_1_1.ja
va:73)
        at
com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_octet_array(CDRInputS
tream_1_0.java:586)
        at
com.sun.corba.se.internal.iiop.CDRInputStream.read_octet_array(CDRInputStrea
m.java:217)
        at
com.coremedia.corba.DefragHang$MyServant._invoke(DefragHang.java:68)
        at
com.sun.corba.se.internal.POA.GenericPOAServerSC.dispatchToServant(GenericPO
AServerSC.java:517)
        at
com.sun.corba.se.internal.POA.GenericPOAServerSC.internalDispatch(GenericPOA
ServerSC.java:207)
        at
com.sun.corba.se.internal.POA.GenericPOAServerSC.dispatch(GenericPOAServerSC
.java:109)
        at com.sun.corba.se.internal.iiop.ORB.process(ORB.java:280)
        at
com.sun.corba.se.internal.iiop.RequestProcessor.process(RequestProcessor.jav
a:81)
        at
com.sun.corba.se.internal.orbutil.ThreadPool$PooledThread.run(ThreadPool.jav
a:106)


REPRODUCIBILITY :
This bug can be reproduced occasionally.

---------- BEGIN SOURCE ----------
/*
 * Copyright (c) 2006 CoreMedia AG, Hamburg. All rights reserved.
 */
package com.coremedia.corba;

import org.omg.CORBA.ORB;
import org.omg.CORBA.SystemException;
import org.omg.CORBA.portable.*;
import org.omg.PortableServer.POA;
import org.omg.PortableServer.POAHelper; import
org.omg.PortableServer.Servant;

import java.util.Properties;

public class DefragHang {

  static final String[] ORB_INIT_ARGS = {}; // {"-ORBDebug", "transport"};

  public static void main(String[] args) throws /*a lot of*/ Exception {
    if(args.length == 0) {
      // server, poa, servant
      ORB server = ORB.init(ORB_INIT_ARGS, new Properties());
      POA poa =
POAHelper.narrow(server.resolve_initial_references("RootPOA"));
      poa.the_POAManager().activate();

      byte[] oid = poa.activate_object(new MyServant());
      org.omg.CORBA.Object reference = poa.id_to_reference(oid);
      String ior = server.object_to_string(reference);
      System.out.println(ior);
      System.out.println("press any key to shut down...");
      System.in.read();
      // shutdown will hang waiting for the unfinished fragmented call
      System.out.println("shutting down...");
      server.shutdown(true);
      System.out.println("shut down.");
    } else {
      String ior = args[0];

      // client, stub
      ORB client = ORB.init(new String[0], new Properties());
      ObjectImpl stub = (ObjectImpl) client.string_to_object(ior);

      // make request big enough to provoke fragmentation
      byte[] payload = new byte[1024];

      OutputStream request = stub._request("callme", true);
      request.write_long(payload.length);
      request.write_octet_array(payload, 0, payload.length);
      if(args.length > 1) {
	// this is the interesting case - server thread remains stuck in
read_octet_array
	// because last fragment never arrives
	System.exit(0);
      }
      InputStream reply = stub._invoke(request);
      stub._releaseReply(reply);
      client.shutdown(true);
    }
  }


  static class MyServant extends Servant implements InvokeHandler {
    public String[] _all_interfaces(POA poa, byte[] objectId) {
      return new String[] { "IDL:egal:1.0" };
    }

    public OutputStream _invoke(String method, InputStream input,
ResponseHandler handler) throws SystemException {
      System.out.println("incoming call...");
      try {
	int length = input.read_long();
	byte[] payload = new byte[length];
	input.read_octet_array(payload, 0, length);
	System.out.println("call to "+method+" received with
"+payload.length+" bytes");
	return handler.createReply();
      } finally {
	System.out.println("...call handled");
      }
    }
  }
}

---------- END SOURCE ----------

                                    

Comments
EVALUATION

Error has been fixed in the current ORB that will be part of JDK 7, except
that it prints an unwanted WARNING from a logger.  This simply
requires changing the REQUEST_CANCELED entry in orbutil.mc to FINE.
                                     
2006-08-12



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