Program: 156070
Project: 156070
Buggy source:
@Override protected Object decode(Channel channel,SocketAddress remoteAddress,Object msg) throws Exception {
  ChannelBuffer buf=(ChannelBuffer)msg;
  if (channel != null) {
    channel.write(ChannelBuffers.wrappedBuffer(new byte[]{0x06}),remoteAddress);
  }
  buf.readUnsignedByte();
  buf.readUnsignedShort();
  String imei=String.format("String_Node_Str",buf.readUnsignedInt()) + String.format("String_Node_Str",buf.readUnsignedMedium());
  if (!identify(imei,channel,remoteAddress)) {
    return null;
  }
  List<Position> positions=new LinkedList<>();
  while (buf.readableBytes() > 2) {
    Position position=new Position();
    position.setProtocol(getProtocolName());
    position.setDeviceId(getDeviceId());
    buf.readUnsignedByte();
    position.setLatitude(buf.readInt() * 0.000001);
    position.setLongitude(buf.readInt() * 0.000001);
    DateBuilder dateBuilder=new DateBuilder().setDate(1980,1,6).addMillis(buf.readUnsignedInt() * 1000L);
    position.setTime(dateBuilder.getDate());
    position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte() * 2));
    position.setCourse(buf.readUnsignedByte() * 2);
    int reason=buf.readUnsignedMedium();
    int status=buf.readUnsignedShort();
    position.set(Event.PREFIX_IO + 1,buf.readUnsignedByte());
    position.set(Event.PREFIX_ADC + 1,buf.readUnsignedByte());
    position.set(Event.KEY_BATTERY,buf.readUnsignedByte());
    position.set(Event.KEY_POWER,buf.readUnsignedByte());
    buf.readUnsignedByte();
    buf.skipBytes(6);
    buf.readUnsignedShort();
    buf.readUnsignedShort();
    position.setAltitude(buf.readUnsignedByte() * 20);
    int quality=buf.readUnsignedByte();
    position.set(Event.KEY_SATELLITES,quality & 0xf);
    position.set(Event.KEY_GSM,quality >> 4);
    buf.readUnsignedByte();
    if (BitUtil.check(reason,6) || BitUtil.check(reason,7)) {
      position.set(Event.KEY_RFID,buf.readBytes(7).toString(Charset.defaultCharset()));
      position.set(Event.KEY_ODOMETER,buf.readUnsignedMedium());
      buf.readUnsignedShort();
    }
    if (BitUtil.check(status,6)) {
    }
    positions.add(position);
  }
  return positions;
}

Fixed version (ground truth):
@Override protected Object decode(Channel channel,SocketAddress remoteAddress,Object msg) throws Exception {
  ChannelBuffer buf=(ChannelBuffer)msg;
  if (channel != null) {
    channel.write(ChannelBuffers.wrappedBuffer(new byte[]{0x06}),remoteAddress);
  }
  buf.readUnsignedByte();
  buf.readUnsignedShort();
  String imei=String.format("String_Node_Str",buf.readUnsignedInt()) + String.format("String_Node_Str",buf.readUnsignedMedium());
  if (!identify(imei,channel,remoteAddress)) {
    return null;
  }
  List<Position> positions=new LinkedList<>();
  while (buf.readableBytes() > 2) {
    Position position=new Position();
    position.setProtocol(getProtocolName());
    position.setDeviceId(getDeviceId());
    buf.readUnsignedByte();
    position.setLatitude(buf.readInt() * 0.000001);
    position.setLongitude(buf.readInt() * 0.000001);
    DateBuilder dateBuilder=new DateBuilder().setDate(1980,1,6).addMillis(buf.readUnsignedInt() * 1000L);
    position.setTime(dateBuilder.getDate());
    position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte() * 2));
    position.setCourse(buf.readUnsignedByte() * 2);
    int reason=buf.readUnsignedMedium();
    buf.readUnsignedShort();
    position.set(Event.PREFIX_IO + 1,buf.readUnsignedByte());
    position.set(Event.PREFIX_ADC + 1,buf.readUnsignedByte());
    position.set(Event.KEY_BATTERY,buf.readUnsignedByte());
    position.set(Event.KEY_POWER,buf.readUnsignedByte());
    buf.readUnsignedByte();
    buf.skipBytes(6);
    buf.readUnsignedShort();
    buf.readUnsignedShort();
    position.setAltitude(buf.readUnsignedByte() * 20);
    int quality=buf.readUnsignedByte();
    position.set(Event.KEY_SATELLITES,quality & 0xf);
    position.set(Event.KEY_GSM,quality >> 4);
    buf.readUnsignedByte();
    if (BitUtil.check(reason,6) || BitUtil.check(reason,7)) {
      position.set(Event.KEY_RFID,buf.readBytes(7).toString(Charset.defaultCharset()));
      position.set(Event.KEY_ODOMETER,buf.readUnsignedMedium());
      buf.readUnsignedShort();
    }
    positions.add(position);
  }
  return positions;
}