Program: 32421
Project: 32421
Buggy source:
private void handleControlFrame(SdlPacket packet){
  int frameInfo=packet.getFrameInfo();
  SessionType serviceType=SessionType.valueOf((byte)packet.getServiceType());
  if (frameInfo == FrameDataControlFrameType.Heartbeat.getValue()) {
    handleProtocolHeartbeat(packet);
  }
  if (frameInfo == FrameDataControlFrameType.HeartbeatACK.getValue()) {
    handleProtocolHeartbeatACK(packet);
  }
 else   if (frameInfo == FrameDataControlFrameType.StartSession.getValue()) {
    sendStartProtocolSessionACK(serviceType,(byte)packet.getSessionId());
  }
 else   if (frameInfo == FrameDataControlFrameType.StartSessionACK.getValue()) {
    Object messageLock=_messageLocks.get(packet.getSessionId());
    if (messageLock == null) {
      messageLock=new Object();
      _messageLocks.put((byte)packet.getSessionId(),messageLock);
    }
    int hashID=0;
    if (_version > 1) {
      if (packet.payload != null && packet.dataSize == 4) {
        hashID=BitConverter.intFromByteArray(packet.payload,0);
      }
    }
    handleProtocolSessionStarted(serviceType,(byte)packet.getSessionId(),_version,"String_Node_Str",hashID,packet.isEncrypted());
  }
 else   if (frameInfo == FrameDataControlFrameType.StartSessionNACK.getValue()) {
    if (serviceType.eq(SessionType.NAV) || serviceType.eq(SessionType.PCM)) {
      handleProtocolSessionNACKed(serviceType,(byte)packet.getSessionId(),_version,"String_Node_Str");
    }
 else {
      handleProtocolError("String_Node_Str" + packet.getSessionId(),null);
    }
  }
 else   if (frameInfo == FrameDataControlFrameType.EndSession.getValue()) {
    if (_version > 1) {
      handleProtocolSessionEnded(serviceType,(byte)packet.getSessionId(),"String_Node_Str");
    }
 else {
      handleProtocolSessionEnded(serviceType,(byte)packet.getSessionId(),"String_Node_Str");
    }
  }
 else   if (frameInfo == FrameDataControlFrameType.EndSessionACK.getValue()) {
    handleProtocolSessionEnded(serviceType,(byte)packet.getSessionId(),"String_Node_Str");
  }
 else   if (frameInfo == FrameDataControlFrameType.EndSessionNACK.getValue()) {
    handleProtocolSessionEndedNACK(serviceType,(byte)packet.getSessionId(),"String_Node_Str");
  }
 else   if (frameInfo == FrameDataControlFrameType.ServiceDataACK.getValue()) {
    if (packet.getPayload() != null && packet.getDataSize() == 4) {
      int serviceDataAckSize=BitConverter.intFromByteArray(packet.getPayload(),0);
      handleProtocolServiceDataACK(serviceType,serviceDataAckSize,(byte)packet.getSessionId());
    }
  }
}

Fixed version (ground truth):
private void handleControlFrame(SdlPacket packet){
  Integer frameTemp=Integer.valueOf(packet.getFrameInfo());
  Byte frameInfo=frameTemp.byteValue();
  SessionType serviceType=SessionType.valueOf((byte)packet.getServiceType());
  if (frameInfo == FrameDataControlFrameType.Heartbeat.getValue()) {
    handleProtocolHeartbeat(packet);
  }
  if (frameInfo == FrameDataControlFrameType.HeartbeatACK.getValue()) {
    handleProtocolHeartbeatACK(packet);
  }
 else   if (frameInfo == FrameDataControlFrameType.StartSession.getValue()) {
    sendStartProtocolSessionACK(serviceType,(byte)packet.getSessionId());
  }
 else   if (frameInfo == FrameDataControlFrameType.StartSessionACK.getValue()) {
    Object messageLock=_messageLocks.get(packet.getSessionId());
    if (messageLock == null) {
      messageLock=new Object();
      _messageLocks.put((byte)packet.getSessionId(),messageLock);
    }
    int hashID=0;
    if (_version > 1) {
      if (packet.payload != null && packet.dataSize == 4) {
        hashID=BitConverter.intFromByteArray(packet.payload,0);
      }
    }
    handleProtocolSessionStarted(serviceType,(byte)packet.getSessionId(),_version,"String_Node_Str",hashID,packet.isEncrypted());
  }
 else   if (frameInfo == FrameDataControlFrameType.StartSessionNACK.getValue()) {
    if (serviceType.eq(SessionType.NAV) || serviceType.eq(SessionType.PCM)) {
      handleProtocolSessionNACKed(serviceType,(byte)packet.getSessionId(),_version,"String_Node_Str");
    }
 else {
      handleProtocolError("String_Node_Str" + packet.getSessionId(),null);
    }
  }
 else   if (frameInfo == FrameDataControlFrameType.EndSession.getValue()) {
    if (_version > 1) {
      handleProtocolSessionEnded(serviceType,(byte)packet.getSessionId(),"String_Node_Str");
    }
 else {
      handleProtocolSessionEnded(serviceType,(byte)packet.getSessionId(),"String_Node_Str");
    }
  }
 else   if (frameInfo == FrameDataControlFrameType.EndSessionACK.getValue()) {
    handleProtocolSessionEnded(serviceType,(byte)packet.getSessionId(),"String_Node_Str");
  }
 else   if (frameInfo == FrameDataControlFrameType.EndSessionNACK.getValue()) {
    handleProtocolSessionEndedNACK(serviceType,(byte)packet.getSessionId(),"String_Node_Str");
  }
 else   if (frameInfo == FrameDataControlFrameType.ServiceDataACK.getValue()) {
    if (packet.getPayload() != null && packet.getDataSize() == 4) {
      int serviceDataAckSize=BitConverter.intFromByteArray(packet.getPayload(),0);
      handleProtocolServiceDataACK(serviceType,serviceDataAckSize,(byte)packet.getSessionId());
    }
  }
  _assemblerForMessageID.remove(packet.getMessageId());
}