opened /dev/cuse fd=3 — cdevpriv is now a struct cuse_server*
mount(fuse, /mnt/tc3192, fd=<cuse>) — kernel now writes a fuse_mount layout into the cuse_server ...
mount failed: Invalid argument (cuse_server already corrupted in-kernel; closing fd now runs cuse_server_free on it)
closing the cuse fd -> cuse_server_free dtor on corrupted object
survived close
TC_RC=0