[tor-bugs] #27471 [Core Tor/Tor]: HS intermittently fails: Non-fatal assertion failed in send_introduce1

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#27471: HS intermittently fails: Non-fatal assertion failed in send_introduce1
-------------------------------------------------+-------------------------
 Reporter:  tgragnato                            |          Owner:  dgoulet
     Type:  defect                               |         Status:
                                                 |  accepted
 Priority:  Very High                            |      Milestone:  Tor:
                                                 |  0.3.4.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.3.2.1-alpha
 Severity:  Minor                                |     Resolution:
 Keywords:  tor-hs, 035-backport, 034            |  Actual Points:
  -unreached-backport, network-team-             |
  roadmap-2019-Q1Q2                              |
Parent ID:  #29995                               |         Points:  3
 Reviewer:  asn                                  |        Sponsor:
                                                 |  Sponsor27-must
-------------------------------------------------+-------------------------
Changes (by dgoulet):

 * owner:  (none) => dgoulet
 * status:  assigned => accepted


Comment:

 My main theory here is related to #28970.

 We've wiped a descriptor from the client cache but kept an intro circuit
 opened. Then, a new descriptor came in for the same service. The RP was
 launched and when it joined, the old intro circuit was selected leading to
 this `BUG()` of a missing IP object.

 The original fix we did was good but not enough where we closed intro
 circuits when we were _replacing_ a descriptor but the case remains of the
 cache cleanup + desc fetch.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27471#comment:45>
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