[tor-bugs] #29875 [Core Tor/Tor]: Going from obfs4 to snowflake using the Tor Network Settings from the Torbutton doesn't work

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#29875: Going from obfs4 to snowflake using the Tor Network Settings from the
Torbutton doesn't work
-------------------------------------------------+-------------------------
 Reporter:  cypherpunks                          |          Owner:  (none)
     Type:  defect                               |         Status:
                                                 |  assigned
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.1.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.3.2.7-rc
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-needs, 034-backport,             |  Actual Points:
  034-backport, 035-backport, 040-backport,      |
  041-should, network-team-roadmap-2019-Q1Q2     |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor19-must
-------------------------------------------------+-------------------------

Comment (by gk):

 Okay, here come the steps tor reproduce this bug on a Linux system:

 1) Take a clean, new Tor Browser alpha.
 2) Start it with `./start-tor-browser.desktop --debug` on the command
 line, but don't connect directly. Rather, configure `obfs4` to use one of
 the built-in bridges.
 3) Continue bootstrap afterwards.
 4) When the browser window shows up click on the onion button on the
 toolbar and select "Tor Network Settings...".
 5) Change the the PT selected to use `snowflake`, click OK.
 6) You should see the `Failed to find node for hop #1 of our path`
 messages right away.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29875#comment:11>
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