[tor-bugs] #20472 [Core Tor/Tor]: circuit_pick_extend_handshake: Non-fatal assertion !(node_prev == NULL) failed

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#20472: circuit_pick_extend_handshake: Non-fatal assertion !(node_prev == NULL)
failed
-------------------------------------------------+-------------------------
 Reporter:  cypherpunks                          |          Owner:
     Type:  defect                               |         Status:
                                                 |  needs_revision
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.2.9.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.2.9.3-alpha
 Severity:  Normal                               |     Resolution:
 Keywords:  TorCoreTeam201610, regression,       |  Actual Points:  0.3
  029-backport                                   |
Parent ID:                                       |         Points:  0.3
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by teor):

 (It's a different case for supporting TAP keys, because we don't just need
 to know *whether* a node supports ntor, we also need its ntor key, which
 the current HS protocol just doesn't provide.)

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Ticket URL: <https://troodi.torproject.org/projects/tor/ticket/20472#comment:5>
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