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I mounted a disk image using a few different FUSE modules and then subsequently renamed the parent directory.

The mounts have disappeared from the mtab and now the OS refuses to unmount them.

fusermount -u mnt returns:

    fusermount: entry for /home/catskul/foo/mnt not found in /etc/mtab

sudo fusermount -u mnt returns:

    fusermount: failed to unmount /home/catskul/foo/mnt: Device or resource busy

sudo fuser -a mnt returns:

    Cannot stat file /proc/986/fd/55: Permission denied
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Killing the process that had the "permission denied" fd and then subsequently issuing fusermount -u mnt did the trick.

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