[tor-bugs] #18116 [Tor]: abort in circuitmux_detach_all_circuits on Tor Browser exit with stem scripts running

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#18116: abort in circuitmux_detach_all_circuits on Tor Browser exit with stem
scripts running
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 Reporter:  teor                     |          Owner:  andrea
     Type:  defect                   |         Status:  assigned
 Priority:  Medium                   |      Milestone:  Tor: 0.2.8.x-final
Component:  Tor                      |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:  crash TorCoreTeam201602  |  Actual Points:
Parent ID:  #18117                   |         Points:
  Sponsor:                           |
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Comment (by andrea):

 So, the assert is happening because it failed to find a circuit for the
 chanid/circid pair left over in the chanid_circid_muxinfo_map, and
 couldn't free the cmux policy specific data for that reason.  The bug here
 is definitely that something is removing a circuit earlier on without
 telling cmux about it, and leaving behind a chanid_circid_muxinfo_map
 entry.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18116#comment:9>
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