[tor-bugs] #19989 [Core Tor/Tor]: Tor fails to bootstrap with a single EntryNode

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#19989: Tor fails to bootstrap with a single EntryNode
------------------------------+--------------------------
     Reporter:  teor          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.???
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  guard
Actual Points:                |  Parent ID:
       Points:  1             |   Reviewer:
      Sponsor:                |
------------------------------+--------------------------
 When I try to run tor with EntryNodes x (where x is a single relay), it
 hangs at:

 {{{
 Aug 26 00:51:57.000 [notice] Bootstrapped 45%: Asking for relay
 descriptors
 Aug 26 00:51:57.000 [notice] I learned some more directory information,
 but not enough to build a circuit: We need more microdescriptors: we have
 0/6973, and can only build 0% of likely paths. (We have 0% of guards bw,
 0% of midpoint bw, and 0% of exit bw = 0% of path bw.)
 Aug 26 00:51:58.000 [notice] Bootstrapped 50%: Loading relay descriptors
 }}}

 This issue might prevent us from switching to one guard in future
 releases.

 I can reproduce this issue on 0.2.9.2-alpha-dev, 0.2.8.{6,7}, maint-0.2.7,
 maint-0.2.6 using the following command:
 {{{
 src/or/tor DataDirectory /tmp/tor.$$ SOCKSPort 0 EntryNodes x
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19989>
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