[tor-bugs] #25061 [Core Tor/Tor]: Relays consider it a bootstrapping failure if they can't extend for somebody else's circuit

[Tor Bug Tracker & Wiki]

#25061: Relays consider it a bootstrapping failure if they can't extend for
somebody else's circuit
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     Reporter:  arma          |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.3.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  backport-032
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 Say you have a relay that is up and listed as non-slow in the consensus.
 Due to the current overload (#24902), this relay is getting many many
 circuit requests per second. Due to bug #24767, we will make a huge number
 of connection attempts to other relays that are down, because as soon as
 we get a "connection refused", we will get another circuit request that
 triggers another connection attempt.

 So when your relay restarts, since it's still in the consensus and clients
 still think it's usable, it will immediately get flooded with circuit
 requests, causing these connection attempts to resume.

 And Tor calls every one of those connection attempts a bootstrapping
 attempt, even if there are no origin circuits related to that connection
 attempt.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25061>
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