[tor-bugs] #21969 [Core Tor/Tor]: We're missing descriptors for some of our primary entry guards

[Tor Bug Tracker & Wiki]

#21969: We're missing descriptors for some of our primary entry guards
------------------------------+--------------------------------
     Reporter:  asn           |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.1.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  tor-guard
Actual Points:                |  Parent ID:
       Points:  1.5           |   Reviewer:
      Sponsor:  SponsorU      |
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 Seems like there are still a few cases where bootstrapping will stall
 because of:
 {{{
 I learned some more directory information, but not enough to build a
 circuit: We're missing descriptors for some of our primary entry guards
 }}}

 It seems to happen mainly with bridges. For me it occured with latest
 master (`b081a7ed2`) when I was switching between using private bridges
 and the default TBB bridges. I also heard reports from s7r about this
 happening.

 We last changed this behavior in #21415, when we made Tor require that we
 have the descriptor of 2 bridges before we start building circuits.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21969>
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