[tor-bugs] #20509 [Core Tor/Tor]: Directory authorities should take away Guard flag from relays with #20499 bug

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#20509: Directory authorities should take away Guard flag from relays with #20499
bug
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     Reporter:  arma          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 Once we resolve #20499, or more precisely, once we figure out which
 versions it affects, we should teach the directory authorities to withhold
 the Guard flag from relays that are running those versions.

 Right now you can't bootstrap from e.g. sofia, which is a huge guard
 running 0.2.9.3-alpha.

 Then later -- or maybe this will turn out to be the easiest solution for
 everything -- we can teach the directory authorities to simply reject
 descriptors from relays running these buggy versions.

 [I'm not sure which milestone to put this in, since it will need to get
 into a majority of directory authorities for it to matter. :/ ]

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Ticket URL: <https://trac.torproject.org/ticket/20509>
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