[keyboard] ukbd stops working after filesystems mount at boot time

[Travelling Particle]

New symptom, as Greg House would say. It appears that keyboard is not as
dead as it looks. If I do shutdown -h, the keyboard suddenly becomes usable:
I can hit any key to reboot. However, between the start of the late boot
stage and the end of halt the system behaves exactly as if somebody pressed
Enter and stick some gum to it to stay that way.

> I am booting off USB stick because I have to attach root partition on HDD
> > with GELI. It all works fine, I am able to enter passphrase on the
> keyboard
> > (there's only ukbd keyboard in the kernel at this moment, but I had tried
> > with atkbd as well; I have also experimented with or without TEKEN with
> no
> > difference). After root partition is mounted, system mounts other geli
> > partitions on the same hard disk. It is right after the filesystems were
> > mounted that the problem starts. The output on console at that moment
> starts
> > to be interleaved with new lines symbols. After late boot stage
> completes, I
> > see login prompt on console, but system acts *as if* I had just pressed
> > Enter and presents login prompt again and again. The keyboard itself
> appears
> > to be dead. If I choose to boot single-mode, behavior is the same -- I
> see
> > multiple shell prompts as if I were hitting Enter repeatedly. I had been
> > trying various configurations in the kernel for over 5 days now, and
> still
> > couldn't make the console work on the system (I can login via network
> > though).
>