make release problem?

Hi,

To experiment with some sysinstall things, I'm trying to build a
-CURRENT release.  This chugs along for some hours and all works fine,
until it tries to create some mfsroot filesystems, right at (nearly) the
end:

[...]
sh -e /usr/src/release/scripts/doFS.sh bsdlabel "" /R/stage/mfsroot/mfsroot /R/stage /mnt  4320 /R/stage/mfsfd 8000 minimum3
+ export BLOCKSIZE=512
+ DISKLABEL=bsdlabel
+ shift
+ MACHINE=
+ shift
+ FSIMG=/R/stage/mfsroot/mfsroot
+ shift
+ RD=/R/stage
+ shift
+ MNT=/mnt
+ shift
+ FSSIZE=4320
+ shift
+ FSPROTO=/R/stage/mfsfd
+ shift
+ FSINODE=8000
+ shift
+ FSLABEL=minimum3
+ shift
+ [ 4320 -eq 0 -a minimum3 = auto ]
+ rm -f /R/stage/mfsroot/mfsroot
+ dd of=/R/stage/mfsroot/mfsroot if=/dev/zero count=4320 bs=1k
+ uname -r
+ [ -f /R/stage/trees/base/boot/boot ]
+ BOOT=-B -b /R/stage/trees/base/boot/boot
+ dofs_md
+ [ x != x ]
+ mdconfig -a -t vnode -f /R/stage/mfsroot/mfsroot
+ MDDEVICE=md0
+ [ ! -c /dev/md0 ]
+ trap umount /mnt; mdconfig -d -u md0 EXIT
+ [ xbsdlabel != x ]
+ bsdlabel -w -B -b /R/stage/trees/base/boot/boot md0 minimum3
+ newfs -O1 -i 8000 -o space -m 0 /dev/md0c
fstab: /etc/fstab:0: No such file or directory
newfs: /dev/md0c: could not find special device
+ umount /mnt
umount: /mnt: not a file system root directory
*** Error code 1

Stop in /usr/src/release.
[...]

AFAICS, it looks like bsdlabel does NOT create /dev/md0c anymore, only
/dev/md0a.  Since the doFS.sh script hasn't been changed since 2004, I
guess there must be some other change somewhere, that has changed either
bsdlabel's (or possibly devd's?) behaviour.

Example:

# dd of=mfsroot if=/dev/zero count=4320 bs=1k
4320+0 records in
4320+0 records out
4423680 bytes transferred in 0.117794 secs (37554363 bytes/sec)
# mdconfig -a -t vnode -f mfsroot
md0
# ls -l /dev/md*
crw-r-----  1 root  operator    0,  90 Jan 16 15:16 /dev/md0
crw-------  1 root  wheel       0,  78 Jan 16 09:08 /dev/mdctl
# bsdlabel -w -B -b /boot/boot md0 minimum3
# ls -l /dev/md*
crw-r-----  1 root  operator    0,  90 Jan 16 15:17 /dev/md0
crw-r-----  1 root  operator    0,  95 Jan 16 15:17 /dev/md0a
crw-------  1 root  wheel       0,  78 Jan 16 09:08 /dev/mdctl
# newfs -O1 -i 8000 -o space -m 0 /dev/md0c
newfs: /dev/md0c: could not find special device

Or am I doing something completely crazy here? :)