[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
------------------------------+------------------------------------------
     Reporter:  teor          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.0.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  regression?, guard-selection
Actual Points:                |  Parent ID:
       Points:  1             |   Reviewer:
      Sponsor:                |
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 When chutney runs under tor's `make test-network` (bridges+hs flavour) on
 master, it sometimes logs a message:
 {{{
 Client asked me to extend back to the previous hop
 }}}

 This could be due to the new guard code, so I'm putting it in 0.3.0 until
 we know for sure. (I've not seen it in 0.2.9, but it's hard to know for
 sure, because it's intermittent.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21534>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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