mysql console, keeps outputting garbled text if 'b' key is pressed

mysql console, keeps outputting garbled text if 'b' key is pressed

mysql -u username -p
mysql>
Now in the console whenever I press the b key the screen goes berserk with garbled text:

Google doesn't help here.
Edit: using ubuntu 12.10 with xterm or the default terminal
Output of mysql --version
mysql  Ver 14.14 Distrib 5.5.31, for debian-linux-gnu (i686) using readline 6.2