[tor-bugs] #18809 [Tor]: Handle linked connections better during bootstrap

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#18809: Handle linked connections better during bootstrap
------------------------+------------------------------------
     Reporter:  teor    |      Owner:
         Type:  defect  |     Status:  new
     Priority:  Medium  |  Milestone:  Tor: 0.2.8.x-final
    Component:  Tor     |    Version:  Tor: 0.2.8.1-alpha
     Severity:  Normal  |   Keywords:  must-fix-before-028-rc
Actual Points:          |  Parent ID:
       Points:          |   Reviewer:
      Sponsor:          |
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 begindir connections advance directly to the CLIENT_SENDING state, even
 before their TLS connection is created.

 So we need to modify the logic from #4483 that checks for consensuses that
 are downloading:
 * is it a direct connection in state after connecting, or
 * a linked connection that's attached, or
 * a linked connection that's in a state after sending

 And then do the standard "extra consensus download check" when we're about
 to link a directory connection to a TLS connection.

 Or arma may have a better idea.

 I am not sure whether we should fix this in 0.2.8, because the current
 code works, but it's not optimal when too many TLS connections hang.
 Tagging it just in case.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18809>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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