[tor-bugs] #23347 [Core Tor/Tor]: Switching from direct connection to a pluggable transport is not working anymore with tor on master

[Tor Bug Tracker & Wiki]

#23347: Switching from direct connection to a pluggable transport is not working
anymore with tor on master
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     Reporter:  gk            |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.2.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 Trying to switch from a direct connection to using a bridge is not working
 anymore with tor on `master` (found while using commit
 f2f1cab2b3c6a56f93862c424663f083b79c7bc3) on my Linux box.

 Steps to reproduce:

 1) Take a recent Tor Browser (e.g. an alpha version)
 2) Make sure you replace `tor` shipped in your Tor Browser instance with
 one compiled from a recent master commit
 3) Start Tor Browser and choose direct connection
 4) Shut Tor Browser down after you got greeted with the `about:tor` page
 5) Restart Tor Browser and press the "Open Settings" button before the
 bootstrapping is finished
 6) Select e.g. the recommended `obfs4` default bridge option
 7) The start-up stalls (I quit Tor Browser after 5 minutes waiting)

 The first bad commit is c21cfd28f43a969229ede02e20c6b554c1b88aae which
 fixed #17750. Without that one Tor Browser resumes bootstrapping after a
 couple of seconds and is using an `obfs4` bridge.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23347>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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