I did inspect the code, and saw more closely where the problem seems to
be.

An unknown client do some file system access, then ltspfsd tries to
mount the device, because the device is still listed in
/var/run/ltsp_fstab. Then, the script /usr/sbin/ltspfs_mount detect this
condition, and call /lib/udev/ltspfs_entry remove, to clean the mount
point from fstab.

At the same moment, udev triggers the remove event, and also call the
script /lib/udev/ltspfs_entry remove.

Both script instances hang on "lbmount --umount".

-- 
ltspfsd hang while removing usb key without LDM
https://bugs.launchpad.net/bugs/378495
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