Program: 75320
Project: 75320
Buggy source:
/** 
 * Process input packets.
 * @exception IllegalActionException If an error occurs readingor writing inputs or outputs.
 */
public void fire() throws IllegalActionException {
  super.fire();
  if (!fromValidateMpdu.hasToken(0))   return;
  int dAck=0;
  RecordToken msg=(RecordToken)fromValidateMpdu.get(0);
  int msgKind=((IntToken)msg.get("String_Node_Str")).intValue();
  if (msgKind == RxMpdu) {
    if (_debugging)     _debug("String_Node_Str");
    RecordToken pdu=(RecordToken)msg.get("String_Node_Str");
    if (intFieldValue(pdu,"String_Node_Str") == 1)     dAck=intFieldValue(pdu,"String_Node_Str");
    int dNav=intFieldValue(pdu,"String_Node_Str");
    int src=misc;
    if (intFieldValue(pdu,"String_Node_Str") == mac_broadcast_addr) {
      RecordToken msgout=new RecordToken(RxIndicateMessageFields,new Token[]{new IntToken(RxIndicate),pdu,msg.get("String_Node_Str"),msg.get("String_Node_Str")});
      toProtocolControl.send(0,msgout);
      if (_debugging)       _debug("String_Node_Str");
    }
 else     if (intFieldValue(pdu,"String_Node_Str") == getID()) {
      boolean dup=false;
      if (intFieldValue(pdu,"String_Node_Str") == 1)       dup=_searchTupleCache(pdu);
      if (intFieldValue(pdu,"String_Node_Str") == 0 || !dup) {
        RecordToken msgout=new RecordToken(RxIndicateMessageFields,new Token[]{new IntToken(RxIndicate),pdu,msg.get("String_Node_Str"),msg.get("String_Node_Str")});
        toProtocolControl.send(0,msgout);
        if (_debugging)         _debug("String_Node_Str");
      }
      if (intFieldValue(pdu,"String_Node_Str") == DataType) {
        RecordToken msgout=new RecordToken(NeedAckMessageFields,new Token[]{new IntToken(NeedAck),pdu.get("String_Node_Str"),msg.get("String_Node_Str"),msg.get("String_Node_Str"),new IntToken(dAck)});
        toProtocolControl.send(0,msgout);
        if (_debugging)         _debug("String_Node_Str");
        _updateTupleCache(pdu);
      }
    }
 else {
      if (intFieldValue(pdu,"String_Node_Str") == ControlType && intFieldValue(pdu,"String_Node_Str") == Rts)       src=Rts;
      if (intFieldValue(pdu,"String_Node_Str") <= 32767) {
        RecordToken msgout=new RecordToken(SetNavMessageFields,new Token[]{new IntToken(SetNav),msg.get("String_Node_Str"),new IntToken(dNav),new IntToken(src)});
        toChannelState.send(0,msgout);
      }
    }
  }
}

Fixed version (ground truth):
/** 
 * Process input packets.
 * @exception IllegalActionException If an error occurs readingor writing inputs or outputs.
 */
public void fire() throws IllegalActionException {
  super.fire();
  if (!fromValidateMpdu.hasToken(0))   return;
  int dAck=0;
  RecordToken msg=(RecordToken)fromValidateMpdu.get(0);
  int msgKind=((IntToken)msg.get("String_Node_Str")).intValue();
  if (msgKind == RxMpdu) {
    if (_debugging)     _debug("String_Node_Str");
    RecordToken pdu=(RecordToken)msg.get("String_Node_Str");
    if (intFieldValue(pdu,"String_Node_Str") == 1)     dAck=intFieldValue(pdu,"String_Node_Str");
    int dNav=intFieldValue(pdu,"String_Node_Str");
    int src=misc;
    if (intFieldValue(pdu,"String_Node_Str") == mac_broadcast_addr) {
      RecordToken msgout=new RecordToken(RxIndicateMessageFields,new Token[]{new IntToken(RxIndicate),pdu,msg.get("String_Node_Str"),msg.get("String_Node_Str")});
      toProtocolControl.send(0,msgout);
      if (_debugging) {
        _debug("String_Node_Str");
      }
    }
 else     if (intFieldValue(pdu,"String_Node_Str") == getID()) {
      boolean dup=false;
      if (intFieldValue(pdu,"String_Node_Str") == 1)       dup=_searchTupleCache(pdu);
      if (intFieldValue(pdu,"String_Node_Str") == 0 || !dup) {
        RecordToken msgout=new RecordToken(RxIndicateMessageFields,new Token[]{new IntToken(RxIndicate),pdu,msg.get("String_Node_Str"),msg.get("String_Node_Str")});
        toProtocolControl.send(0,msgout);
        if (_debugging)         _debug("String_Node_Str");
      }
      if (intFieldValue(pdu,"String_Node_Str") == DataType) {
        RecordToken msgout=new RecordToken(NeedAckMessageFields,new Token[]{new IntToken(NeedAck),pdu.get("String_Node_Str"),msg.get("String_Node_Str"),msg.get("String_Node_Str"),new IntToken(dAck)});
        toProtocolControl.send(0,msgout);
        if (_debugging)         _debug("String_Node_Str");
        _updateTupleCache(pdu);
      }
    }
 else {
      if (intFieldValue(pdu,"String_Node_Str") == ControlType && intFieldValue(pdu,"String_Node_Str") == Rts)       src=Rts;
      if (intFieldValue(pdu,"String_Node_Str") <= 32767) {
        RecordToken msgout=new RecordToken(SetNavMessageFields,new Token[]{new IntToken(SetNav),msg.get("String_Node_Str"),new IntToken(dNav),new IntToken(src)});
        toChannelState.send(0,msgout);
      }
    }
  }
}