[tor-bugs] #18117 [Tor]: When stem calls controller.close_circuit(circuit_id), circuits don't really close

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#18117: When stem calls controller.close_circuit(circuit_id), circuits don't really
close
------------------------+--------------------------------
     Reporter:  teor    |      Owner:
         Type:  defect  |     Status:  new
     Priority:  Medium  |  Milestone:  Tor: 0.2.8.x-final
    Component:  Tor     |    Version:
     Severity:  Normal  |   Keywords:
Actual Points:          |  Parent ID:
       Points:          |    Sponsor:
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 I'm using master (0.2.8-alpha-dev) and a stem script similar to the
 example custom_path_selection.py, but that calls
 controller.close_circuit(circuit_id) after using each circuit.

 This may be related to the abort in #18116.

 I get a lot of messages similar to this:
 {{{
 [notice] No circuits are opened. Relaxed timeout for circuit 170239 (a
 Circuit made by controller 3-hop circuit in state doing handshakes with
 channel state open) to 60000ms. However, it appears the circuit has timed
 out anyway. 20 guards are live. [59 similar message(s) suppressed in last
 3600 seconds]
 }}}

 It may be that the log message is just wrong, or it may be that stem isn't
 doing the right thing to close the circuit, or it may be that tor isn't
 really cleaning up well after controller circuits. The abort in #18116
 suggests the latter.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18117>
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