On Sep 19, 2006, at 11:05 AM, Jukka Salmi wrote:

> Jukka Salmi --> current-users (2006-09-19 17:02:58 +0200):
>> Hi,
>>
>> I haven't used sysinst about a year, and I don't know if it is still
>> supposed to work. In case it is: I just failed to install a NetBSD/ 
>> i386
>> system using sysinst:
>
> Forgot to mention: this is CVS HEAD sysinst as of 2006-09-15.

Try this in a shell:
# mount -u $ROOTDEV /

And see if you get:
mount: cannot open '/dev/md0a': Operation not permitted


That being the case, it looks like some kauth / security policy  
change fallout. I reported the same problem on the 12th.