Unable to unmount idle filesystem on 6.2

[Kris Kennaway]

Darren Pilgrim wrote:
> I'm unable to unmount an idle filesystem (or even drop it to
> read-only):
> 
> # mount
> /dev/da0s1a on / (ufs, local, noatime)
> devfs on /dev (devfs, local)
> /dev/da0s1d on /var (ufs, local, noatime, soft-updates)
> /dev/da0s1e on /usr (ufs, local, noatime, soft-updates)
> /dev/da0s1fp1 on /usr/obj (ufs, asynchronous, local, noatime)
> /dev/da0s1fp2 on /usr/ports (ufs, local, soft-updates)
> /dev/da0s1fp3 on /usr/src (ufs, local, soft-updates)
> /dev/da0s2d on /data (ufs, local, noatime, soft-updates)
> 
> # fstat -f /usr/ports
> USER     CMD          PID   FD MOUNT      INUM MODE         SZ|DV R/W
> 
> # umount /usr/ports
> umount: unmount of /usr/ports failed: Device busy
> 
> # umount -f /usr/ports
> umount: unmount of /usr/ports failed: Device busy
> 
> # mount -o ro /usr/ports
> mount: /dev/da0s1fp2: Operation not permitted
> 
> # uname -r
> 6.2-RELEASE-p8
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> 

Strange, can you break to DDB and do 'show lockedvnods'?

Kris