port-atari/48599: NetBSD crashes when switched over virtual terminal with F10 on Atari TT

[segabor%gmail.com@localhost]

>Number:         48599
>Category:       port-atari
>Synopsis:       NetBSD crashes when switched over virtual terminal with F10 on 
>Atari TT
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-atari-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Feb 16 16:00:00 +0000 2014
>Originator:     Gabor Sebestyen
>Release:        NetBSD 6.1.3
>Organization:
>Environment:
NetBSD teetime 6.1.3 NetBSD 6.1.3 (ATARITT) atari
>Description:
I installed a fresh copy of NetBSD 6.1.3 to my Atari TT030. Vanilla ATARITT 
kernel is used.
The machine has 4 MB ST + 16 MB TT RAM, no additional cards or mods.

Currently two virtual terminals, ttye0 and ttye1 is enabled, they can be 
accessed by pressing Alt + F1 or Alt + F2.
But when I try to switch over an unconfigured virtual terminal, BSD crashes 
with "panic: MMU fault" then reboots after generating core dump.

>How-To-Repeat:
It is easy to repeat. Just press Alt+F10 or a higher function key which is 
known to jump over a undefined vt.

>Fix: