[tor-bugs] #19074 [Core Tor/Tor]: Mark fallback directories down when their key is wrong

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#19074: Mark fallback directories down when their key is wrong
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     Reporter:  teor     |      Owner:
         Type:  defect   |     Status:  new
     Priority:  Medium   |  Milestone:  Tor: 0.2.8.x-final
    Component:  Core     |    Version:
  Tor/Tor                |   Keywords:  must-fix-before-0283, must-fix-
     Severity:  Normal   |  before-028-rc
Actual Points:           |  Parent ID:  #18809
       Points:  0.5      |   Reviewer:
      Sponsor:           |
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 arma says that we will happily retry fallback directories with the wrong
 key fingerprint. We can do two things to fix this:
 * mark fallback directories as down when their key fingerprint is wrong
 * cancel all pending connections to a fallback with the wrong key (perhaps
 in #18809) - this should be unlikely with 100 fallbacks

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19074>
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