ControlPort has undocumented behavior
== Problem 1
ControlPort's value can be set to address:port though
man torrc says that only port can be specified.
== Problem 2
ControlPort can be set few times to bind to different "address:port"s. This is also not documented. Other options which can be set multiple times are explicitly documented with a statement like
This directive can be specified multiple times to bind to multiple addresses/ports
Original comment about these issues is [[http://ea5faa5po25cf7fb.onion/projects/tor/ticket/28676#comment:15|here]].