NFS umount on shutdown

[Jan Stary]

This is 5.2/i386 client (ibm) on an IBM Thinkpad.
It mounts a NFS share from another box (current/amd64).
Everything works fine, except when the client shuts down,
the NFS handle is still recognized on the (amd64) server.

box:~$ showmount -a
All mount points on localhost:
ibm.stare.cz:/media

Is that intended? One would expect the shutdown
procedure to umount all filesystems, including NFS.

        Jan