[tor-bugs] #15761 [Tor]: UseBridges and ExitNodes don't play together

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#15761: UseBridges and ExitNodes don't play together
--------------------+------------------------------
 Reporter:  qbi     |          Owner:
     Type:  defect  |         Status:  new
 Priority:  normal  |      Milestone:
Component:  Tor     |        Version:  Tor: 0.2.6.7
 Keywords:          |  Actual Points:
Parent ID:          |         Points:
--------------------+------------------------------
 Tor's Q&A page has a [https://tor.stackexchange.com/q/6697/88 question]
 where someone uses bridges and `ExitNodes` and can't get a connection. So
 I tried to reproduce it:

 1. Retrieve some bridges (with obfs3 in this case) and enter them into
 `torrc`.
 2. Set `ExitNodes {US}`
 3. restart Tor and everything is fine.
 4. Add `UseBridges 1` and restart Tor.

 Now Tor can't get a connection anymore. I see the following log message
 every second:

 {{{
 Apr 21 19:05:42.000 [info] should_delay_dir_fetches(): Delaying dir
 fetches (no running bridges known)
 Apr 21 19:05:42.000 [info] compute_weighted_bandwidths(): Empty routerlist
 passed in to consensus weight node selection for rule weight as guard
 }}}

 When I remove `UseBridges` and restart Tor everything is fine.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15761>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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