Suppose I have an NFS mount on /foo and another on top of that, say /foo/bar. Now, when the NFS server dies, I can't umount /foo because of the /foo/bar mount. But I also cannot umount /foo/bar because that apparently tries to access /foo/bar (the bar directory in the /foo NFS mount) and that failes.
Is that intentional? Any way to get out short of rebooting? (In the real case, the NFS server didn't die, it was updated from -6 to -8 and the NFS handles seem to be incompatible, probably because of the struct ufid change.)
