Does the program freeze when calling a function in a slot?

Question

Qt

void MainWindow::readData()
{
    QByteArray data = serial->readAll();
    console->putData(data);

    //ProcessRawData();
}

If uncommented, the program freezes (

Answer 1

Well, for example, it would be possible to provide the code of the function on which everything hangs (I mean ProcessRawData)