[tor-bugs] #19162 [Core Tor/Tor]: Make it even harder to become HSDir

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#19162: Make it even harder to become HSDir
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 Reporter:  asn                                  |          Owner:  arma
     Type:  defect                               |         Status:
 Priority:  Medium                               |  accepted
Component:  Core Tor/Tor                         |      Milestone:  Tor:
 Severity:  Normal                               |  0.2.9.x-final
 Keywords:  tor-hs SponsorR 029-proposed         |        Version:  Tor:
  TorCoreTeam201606                              |  0.2.7
Parent ID:                                       |     Resolution:
 Reviewer:                                       |  Actual Points:
                                                 |         Points:
                                                 |        Sponsor:
                                                 |  SponsorR-can
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Comment (by asn):

 Hmm, interesting. I tried to repro this in chutney, and indeed the tks
 seem to increase all the time even if I kill some of the relays. However,
 I don't know if rephist works the same in chutney as in the normal net, so
 this might be worth exploring further on moria.

 Roger, how would you feel about adding something like this:
 {{{
   {
     int i = 0;
     for (i = 0 ; i < n_active; i++) {
       log_warn(LD_GENERAL, "TK %d/%d: %ld", i, n_active, tks[i]);
     }
   }
 }}}
 in `dirserv_compute_performance_thresholds()` after the `tks` array gets
 initialized? That will result in about 6k lines of logs every hour... But
 just doing it for a few hours should be sufficient to get some
 understanding.

 When I did the above in chutney, all the tk elements seem to increase even
 if the corresponding relay was down. Also, the first element of the array
 was always set to 0 (maybe that's us and it's a bug?).

 (Finally, looking at moria's logs, `guard_tk` seems to always be set to
 `TIME_KNOWN_TO_GUARANTEE_FAMILIAR`. I guess that's on purpose.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19162#comment:9>
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