[tor-bugs] #19721 [Core Tor/Tor]: Circuit on detached list which I had no reason to mark

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#19721: Circuit on detached list which I had no reason to mark
------------------------------+-----------------
     Reporter:  cypherpunks   |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Major         |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+-----------------
 Running a relay on Debian 8 amd64.
 0.2.7.6-1~d80.jessie+1

 While investigating why my relay had basically no network traffic
 (<MBit/s) for several hours, I stumbled onto this log line:

 {{{circuit_unlink_all_from_channel(): Bug: Circuit on detached list which
 I had no reason to mark (on Tor 0.2.7.6 )}}}

 Network traffic was down (most likely NOT due to infrastructure/upstream
 issues), at the end of that period the log entry appeared and network
 traffic got back to normal.

 Since I'm not sure whether this is a duplicate of
 https://trac.torproject.org/projects/tor/ticket/12184
 I'm reporting it separately and leave it for others to flag it as
 duplicate if that seems to be the case.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19721>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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