[tor-bugs] #23818 [Core Tor/Tor]: Make v3 single onion services retry failed connections with a 3-hop path

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#23818: Make v3 single onion services retry failed connections with a 3-hop path
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  teor
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.2.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.2.9.3-alpha
 Severity:  Normal                               |     Resolution:
 Keywords:  consider-backport-after-0421-alpha,  |  Actual Points:  0.2
  029-backport-maybe-not, 035-backport,          |
  040-baclport, 041-backport, v3-onion-service-  |
  feature-parity, prop224, tor-hs, single-       |
  onion, ipv6, network-team-roadmap-august       |
Parent ID:  #23493                               |         Points:  1
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor27-must
-------------------------------------------------+-------------------------
Changes (by teor):

 * status:  assigned => needs_review
 * keywords:
     v3-onion-service-feature-parity, prop224, tor-hs, single-onion, ipv6,
     network-team-roadmap-august
     =>
     consider-backport-after-0421-alpha, 029-backport-maybe-not,
     035-backport, 040-baclport, 041-backport, v3-onion-service-feature-
     parity, prop224, tor-hs, single-onion, ipv6, network-team-roadmap-
     august
 * version:   => Tor: 0.2.9.3-alpha
 * actualpoints:   => 0.2


Comment:

 It turns out that there is actually an identical bug in v2 and v3 onion
 services, from the original v2 implementation in 0.2.9.3-alpha.

 Here are the PRs for the fix:
 * 0.2.9: https://github.com/torproject/tor/pull/1255
   * v2 fix
 * 0.3.5: https://github.com/torproject/tor/pull/1256
   * v3 fix
 * master: https://github.com/torproject/tor/pull/1257
   * comment fix

 I don't know how far we should backport this fix. It's a reachability fix.
 I think we should backport to 0.3.5, I'm not sure if we should worry about
 0.2.9.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23818#comment:23>
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