port-i386/39866: NetBSD does not like dual GPT/mbr partitions

[hramrach%centrum.cz@localhost]

>Number:         39866
>Category:       port-i386
>Synopsis:       NetBSD does not like dual GPT/mbr partitions
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Nov 04 10:15:00 +0000 2008
>Originator:     Michal Suchanek
>Release:        5.0 BETA
>Organization:
CUNI
>Environment:
NetBSD 5.99.1 i386
>Description:
There are several problems with the new support for GPT partitions as dk 
devices.

 - on an Intel mac after upgrade from 4.01 to 5 BETA the system no longer 
boots. It is impossible to use the wd0a device (Device busy). The system comes 
up with the wd0a content mounted ro on / but fsck fails because wd0a is busy 
and the system drops into root shell.

 - the installer tries to install and upgrade on wd0a and fails miserably for 
the same reason

 - the situation with the partitions being visible in two ways but accessible 
only in one way is confusing

 - I doubt wd0b (e,f,..) would be accessible with the current scheme but I do 
not have one so I cannot tell
>How-To-Repeat:
1) install NetBSD 4.01 on a disk formatted by OS X Intel

2) upgrade the kernel to 5 BETA
>Fix:
disable GPT support in the 5 BETA kernel