[tor-bugs] #21967 [Core Tor/Tor]: obfs4proxy not killed when unused

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#21967: obfs4proxy not killed when unused
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     Reporter:  asn           |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.1.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  tor-pt
Actual Points:                |  Parent ID:
       Points:  1.5           |   Reviewer:
      Sponsor:                |
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 Seems like Tor does not successfuly kill obfs4proxy when it's no longer
 used. It's unclear why. Maybe obfs4proxy never receives the SIGTERM, or
 never notices that the stdin is closed?

 Experiment:
 - Startup Tor Browser using default obfs4 bridges.
 - Check that obfs4proxy process has spawned (`ps -fax | grep obfs`)
 - Reconfigure Tor Browser to not use bridges at all.
 - Check that obfs4proxy process is still there...

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21967>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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