[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
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 Reporter:  tgragnato            |          Owner:  (none)
     Type:  defect               |         Status:  new
 Priority:  Very High            |      Milestone:  Tor: 0.3.5.x-final
Component:  Core Tor/Tor         |        Version:  Tor: 0.3.4.7-rc
 Severity:  Minor                |     Resolution:
 Keywords:  tor-hs, regression?  |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
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Changes (by dgoulet):

 * priority:  Very Low => Very High
 * keywords:   => tor-hs, regression?
 * milestone:   => Tor: 0.3.5.x-final


Comment:

 Wow... this one is very surprising, I've never seen it in the wild until
 now...

 The big picture of what this means is that we got the ACK from the
 Rendezvous so we were about to send the INTRODUCE1 cell to the intro point
 but using the HS identifier in the introduction circuit we have, we were
 unable to find the intro point object leading to the assert().

 Thus, something somehow, made our intro point object to be removed or the
 intro point authentication key on the circuit is unknown to the service...

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27471#comment:1>
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