[tor-bugs] #21534 [Core Tor/Tor]: "Client asked me to extend back to the previous hop" in small networks

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#21534: "Client asked me to extend back to the previous hop" in small networks
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 Reporter:  teor                                 |          Owner:  (none)
     Type:  defect                               |         Status:  new
 Priority:  Very High                            |      Milestone:  Tor:
                                                 |  0.3.2.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  regression?, guard-selection,        |  Actual Points:
  dirauth                                        |
Parent ID:  #21573                               |         Points:  1
 Reviewer:                                       |        Sponsor:
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Comment (by dgoulet):

 I appears that `longclaw` is seeing those warnings quite a bit. Info logs
 from October 25th shows that it happens a lot thus it is confirmed that
 this is on the real network as well.

 Fortunately, things like reachability test from authorities don't require
 a `Guard` so this random circuit breakage wouldn't affect that at least
 thus failing to vote on Running for some relays.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21534#comment:7>
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