Tor fails to create new controller circuits when the path isn't specified. ``` extendcircuit 0 purpose=general 250 EXTENDED 8 extendcircuit 0 purpose=controller 551 Couldn't start circuit ``` and logs... ``` Oct 30 14:43:25.000 [warn] circuit_launch_by_extend_info(): Bug: unexpected purpose 19 when cannibalizing a circ. ```