[tor-bugs] #33745 [Circumvention/Snowflake]: Merge a turbotunnel branch

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#33745: Merge a turbotunnel branch
-------------------------------------+--------------------------
 Reporter:  dcf                      |          Owner:  dcf
     Type:  task                     |         Status:  assigned
 Priority:  Medium                   |      Milestone:
Component:  Circumvention/Snowflake  |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:  turbotunnel              |  Actual Points:
Parent ID:  #19001                   |         Points:
 Reviewer:                           |        Sponsor:
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Comment (by dcf):

 Replying to [comment:1 arma]:
 > > * Test without `LearnCircuitBuildTimeout 0` and find another
 workaround, if necessary. See comment:15:ticket:33336.
 >
 > I did all my quic tests with those torrc changes commented out (i.e. I
 used what normal Tor Browser would have given me).

 Thanks, that's good to know. I added the `CircuitBuildTimeout` changes in
 an uncontrolled way at the same time as the idle timeout fixes in #33336,
 so it's possible they are not necessary. I'll try just removing them and
 see how it goes. What I was afraid of is a case where the first time you
 connect, you get lucky and get a working proxy on the first try, and tor
 learns a `CircuitBuildTimeout` of 60 seconds. Then then next time you
 connect, maybe it takes four tries to get a working proxy, but by then tor
 has given up according to the shorter timeout it learned. But I don't know
 if it really works like that or how eagerly tor adjusts the learned
 timeout.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33745#comment:3>
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