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umount -l fs_to_umount
or forced umount:-l
Lazy unmount. Detach the filesystem from the filesystem hierarchy now, and cleanup all references to the filesystem as soon as it is not busy anymore. (Requires kernel 2.4.11 or later.)
umount -f ...
Also: https://serverfault.com/questions/17284 ... ead-chroot-f
Force unmount (in case of an unreachable NFS system). (Requires kernel 2.1.116 or later.)
wiak
But maybe getting a bit too off-topic. The export -f chroot_in situation of more interest.