When I try to umount the FUSE file system, I get an error:
root@ubuntu:/home/fufs/src# fusermount -u /tmp/kpfss
fusermount: failed to unmount /tmp/kpfss: Invalid argument
root@ubuntu:/home/fufs/src# fusermount -z -u /tmp/kpfss
fusermount: failed to unmount /tmp/kpfss: Invalid argument
How can I umount the file system? Thanks.