[tor-bugs] #21052 [Core Tor/Tor]: Bad prop271 behavior when exhausting all guards

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#21052: Bad prop271 behavior when exhausting all guards
--------------------------------------------+------------------------------
 Reporter:  asn                             |          Owner:  asn
     Type:  defect                          |         Status:  needs_review
 Priority:  High                            |      Milestone:  Tor:
                                            |  0.3.0.x-final
Component:  Core Tor/Tor                    |        Version:
 Severity:  Normal                          |     Resolution:
 Keywords:  prop271, tor-guard, regression  |  Actual Points:  0.6
Parent ID:  #20822                          |         Points:  1.5
 Reviewer:  nickm                           |        Sponsor:
--------------------------------------------+------------------------------

Comment (by asn):

 Replying to [comment:6 nickm]:
 > Yes, I think this is a good approach.  Nice code reuse too. I've merged
 it to master.
 >
 > I ''do'' wonder about whether this can ever cause us to hammer on all of
 our sampled guards, over and over.  But maybe that suggest we should rate-
 limit circuits when we seem to be down or something.  In any case, it's
 not a regression from 0.2.9.x behavior as far as I can tell.
 >
 > As a followup, could you please write a quick note about this in guard-
 spec.txt before we close the ticket?
 >

 ACK. Please see branch `bug21052` in my torspec repo.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21052#comment:7>
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