[tor-bugs] #28255 [Core Tor/Tor]: verify guard selection consensus expiry constraints

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#28255: verify guard selection consensus expiry constraints
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     Reporter:           |      Owner:  catalyst
  catalyst               |
         Type:  task     |     Status:  assigned
     Priority:  Medium   |  Milestone:  Tor: 0.3.6.x-final
    Component:  Core     |    Version:
  Tor/Tor                |   Keywords:  bootstrap, clock-skew, tor-guard,
     Severity:  Normal   |  usability, ux, s8-errors, 035-roadmap-subtask,
                         |  035-triaged-in-20180711, s8-bootstrap
Actual Points:           |  Parent ID:  #23605
       Points:  1        |   Reviewer:
      Sponsor:           |
  Sponsor8               |
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 The hypothesis in #23605 is that bootstrapping can get stuck at #23605 if
 there is enough clock skew for the consensus to be expired but still
 "reasonably live". Let's verify this and try to record more details.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28255>
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