[tor-bugs] #15515 [Tor]: Don't allow multiple INTRODUCE1s on the same circuit

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#15515: Don't allow multiple INTRODUCE1s on the same circuit
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     Reporter:  asn      |      Owner:
         Type:  defect   |     Status:  needs_review
     Priority:  normal   |  Milestone:  Tor: 0.2.6.x-final
    Component:  Tor      |    Version:
   Resolution:           |   Keywords:  026-backport 025-backport
Actual Points:           |  024-backport
       Points:           |  Parent ID:  #15463
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Comment (by asn):

 <armadev> dgoulet: what if the hsdesc has only two intro points, and
 there's a newer hsdesc with two and one of them overlaps. you try both,
 discard desc, get new desc, try the two new ones, there you are with a
 fine intro circ open already to one of the two new ones.

 here is a possible edge case for clients that don't have `b5525476`, that
 could make us trigger this warning.

 if the above is possible we should consider one of these two possible
 avenues:
 - reduce the logging severity of the warning message from this ticket to
 info, till 0.2.5 goes out of style.
 - backport `b5525476` to older releases
 - ???

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15515#comment:19>
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