The keyboard freezes, and becomes unresponsive if an ongoing action in the terminal is aborted by the user with CTRL+C
How to reproduce:
Open the terminal and begin an installation, or a compilation process of some application, using a command.
In the middle of that process abort/cancel it by the user, using CTRL+C on the keyboard layout.
The result is a complete freeze of any keyboard input whatsoever, and the phone needs to be rebooted.