I've been running the venus client for a while now, but now it won't
start:

14:40:40 Probably another Venus is running! open(/dev/cfs0) failed (19),
exiting
[1]+  Exit 255                venus     

I checked and /dev/cfs0 exists:

crw-r--r--   1 root     root      67,   0 Jun  1 13:59 /dev/cfs0 


Also, I did ps aux as root and no venus is running.  What on earth could
be causing this?  How can I find out if other programs are already
referencing /dev/cfs0?