[tor-bugs] #27841 [Core Tor/Tor]: Surprise race: Intro point closes circuit after NACK, at the same time as client tries to extend circuit to new intro point

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#27841: Surprise race: Intro point closes circuit after NACK, at the same time as
client tries to extend circuit to new intro point
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 Reporter:  asn                                  |          Owner:  neel
     Type:  defect                               |         Status:  closed
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.5.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:  fixed
 Keywords:  tor-hs dos 035-backport              |  Actual Points:
  040-backport 041-backport                      |
Parent ID:                                       |         Points:
 Reviewer:  dgoulet                              |        Sponsor:
                                                 |  Sponsor27
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Comment (by dgoulet):

 Replying to [comment:29 nickm]:
 > I remember that yesterday you were showing me logs that involved an
 intropoint on a relay that still had 0.3.4.  Maybe it's time to tell the
 authorities to stop listing these?

 That is how I found this issue, by running intro points on 0.3.4.9 ... so
 either that or we patch clients to stop selecting them.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27841#comment:30>
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