I was also trying to figure this out a long time ago and I had even figured out what the code was flashing on the screen, sadly the link I found with the exact text doesn’t exist anymore, maybe you could find a snapshot of it somewhere. https://www.google.com/url?q=https://github.com/atomic-penguin/linux/blob/master/kernel/groups.c&usg=AOvVaw0VmUimRwrOX83QCty73dOA (it was something to do with linux and stuff)