panic when loading mirror

[Fernan Aguero]

Hi,

I'm playing with gmirror on a box with a pair of spare
slices before installing a production box.

The box is running 6.1-RC (i386), and has two identical
disks (ad0, ad2) already sliced and partitioned:

ad0:
ad0s1	unused slice
ad0s2	ad0s2b (swap), ad0s2a (/), ad0s2d (/var), ad0s2e (/usr) ...

ad2:
ad2s1	unused slice
ad2s2	ad2s2b (swap), ad2s2d (/tmp), ad2s2e (/usr/ports) ...

My idea was to use the unused slices (identical in size) to
set up a geom mirror.

After reading the man pages and the following guides
http://www.onlamp.com/pub/a/bsd/2005/11/10/FreeBSD_Basics.html?page=1
http://people.freebsd.org/~rse/mirror/
this is what I did:

# gmirror label -v -b round-robin gm0s1 ad0s1 ad2s1
Metadata value stored on ad0s1.
Metadata value stored on ad2s1.
Done.

But then attempting to load the mirror, causes a system
panic. I'm copying the messages by hand, so excuse any typo.
Also, I'm copying what I see on the screen ... I can't know
if there were other errors before the ones I'm transcribing
(capturing the session with script(1) doesn't help here).

# gmirror load
WARNING: Expected rawoffset 0, found 63
WARNING: Device name truncated! (mirror/gsm0s1ccccccccccccc...c)
[ this is repeated several times. gsm0s1 is followed above
by 51 'c's) ]

Fatal double fault:
eip = 0xc04a7982
esp = 0xe2244ff4
ebp = 0xe2245038
panic: double fault


My questions:

did I do something wrong? (maybe the system shouldn't let me
instead of entering into a panic ...)

Was this caused because I used already sliced and
partitioned disks? The second example in the guide written
by rse uses slices ... 

Or is this something that is expected to happen and should
be fixed?

Thanks in advance,

Fernan