Somewhere in the old RedHat 9 box, with SAMBA 3, the smbfs hang on when mount it. After some search, with the reference: 记mount NFS遇到的一个问题(-o nolock), the solution is to add an option nolock when mount. That is:
# mount -t nfs -o nolock //REMOTE /LOCAL.
The description is: Disable NFS locking. Do not start lockd. This has to be used with some old NFS servers that don’t support locking.