What’s a stale file handle? A file handle becomes stale when the file or directory referenced by the handle is removed by another host/server, while our client still holds an active reference to the object file/directory. A typical example occurs when the current directory of a process, running on our client, is removed on the server (either by a process running on the server or on another client).
If your NFS file handles are stale, run this command.
/usr/bin/exportfs -a |