BUG in tty_open when using containers and ptrace

[Alan Cox]

> Talking to myself (again), kmemleak doesn't report anything (apart from
> a few unrelated early-init warnings) but running the startup/shutdown loop
> on tty1 causes totally crazy behaviour on every VT I used. By "totally
> crazy" I mean not responding properly to arrow keys, backspace etc., but

You are only seeing this with containers ?