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

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#21969: We're missing descriptors for some of our primary entry guards
-----------------------------------+------------------------------------
 Reporter:  asn                    |          Owner:
     Type:  defect                 |         Status:  new
 Priority:  High                   |      Milestone:  Tor: 0.3.1.x-final
Component:  Core Tor/Tor           |        Version:
 Severity:  Normal                 |     Resolution:
 Keywords:  tor-guard, tor-bridge  |  Actual Points:
Parent ID:                         |         Points:  1.5
 Reviewer:                         |        Sponsor:  SponsorU
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Comment (by catalyst):

 Replying to [comment:11 teor]:
 > All bridges are directory mirrors.
 >
 > But there will always be a tradeoff when all our primary guards aren't
 working between:
 > * fail (and be more secure), and
 > * try another guard/bridge/fallback/directory authority (and be more
 usable).
 >
 > Looks like we set the bar too low. Or there is another bug.

 I think maybe we should be more lenient about trying other guards when we
 have no (or very limited) reachability information (e.g., during
 bootstrapping from zero state) than when we have fresh reachability
 information, especially when bridges are involved.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21969#comment:12>
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