I discovered that the machines that scanned our passports as we clear the customs are on Windows. How do I know that? It gave me the blue screen as I put in my passport to scan. And then it do a core dump. So me and all those queueing behind me got to queue again at the other rows. As I was in the queue in the next row, I see the machine reboot, showing the windows logo. And it shows the windows desktop after booted and display a message that say the machine just recovered from a fatal error. After that my new machine managed to scanned my passport successfully and I left.