error mounting nfs shares

Hi all,

after updating my system to recent sources (using yesterdays
23:30 UTC checkout), my mountd won't work as expected (as it
does for about a year now).

I'm using /etc/fstab entries like below to create chroot
environments to build kernel, world and ports on a fast
machine for slower machines. All machines in my environment
are using similar fstab's.

--- BEGIN /etc/fstab extract
statler:/usr/src        /usr/room/p2/usr/src    nfs     rw,noauto 
0       0
statler:/usr/ports      /usr/room/p2/usr/ports  nfs     rw,noauto 
0       0
devfs                   /usr/room/p2/dev        devfs   rw,auto 0       0
procfs                  /usr/room/p2/proc       procfs  rw,auto 0       0
--- END /etc/fstab extract

--- BEGIN /etc/exports
/usr -alldirs -maproot=root -network 10.62.10.0 -mask 255.255.0.0
/var/www -alldirs -maproot=nobody -alldirs -network 10.62.10.0 -mask 
255.255.255.0
/mnt/tmp -alldirs -maproot=root -network 10.62.10.0 -mask 255.255.0.0
/mnt/media -alldirs -maproot=root -network 10.62.10.0 -mask 255.255.0.0
/music -alldirs -maproot=root -network 10.62.10.0 -mask 255.255.0.0
--- END /etc/exports

--- BEGIN error messages from /var/log/messages
Apr 28 10:47:23 statler mountd[507]: can't change attributes for /usr
Apr 28 10:47:23 statler mountd[507]: bad exports list line /usr -alldirs 
-maproot
Apr 28 10:47:23 statler mountd[507]: can't change attributes for /var/www
Apr 28 10:47:23 statler mountd[507]: bad exports list line /var/www 
-alldirs -maproot
Apr 28 10:47:23 statler mountd[507]: can't change attributes for /mnt/tmp
Apr 28 10:47:23 statler mountd[507]: bad exports list line /mnt/tmp 
-alldirs -maproot
Apr 28 10:47:23 statler mountd[507]: can't change attributes for /mnt/media
Apr 28 10:47:23 statler mountd[507]: bad exports list line /mnt/media 
-alldirs -maproot
Apr 28 10:47:23 statler mountd[507]: can't change attributes for /music
Apr 28 10:47:23 statler mountd[507]: bad exports list line /music 
-alldirs -maproot
Apr 28 10:47:53 statler mountd[507]: mount request denied from 
10.62.10.4 for /usr/src
--- END error messages from /var/log/messages

Finally I want say, that the first NFS mount succeeds, only the second
one and all following ones will fail. I didn't found anything that
guides me to solve an error I made on my own reading man-pages belongs
to it (mountd(8), fstab(5), exports(5) and referred ones) and
/usr/src/UPDATING.

Any help would be very nice :-)

Best regards,
Jens