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[tor-bugs] #21446 [Core Tor/Tor]: Number of Introduction Points for a (SingleOnion?) HS seems variable, or degrades with time

#21446: Number of Introduction Points for a (SingleOnion?) HS seems variable, or
degrades with time
------------------------------+-----------------
     Reporter:  alecmuffett   |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+-----------------
 I'm helping some people tune a very large Tor Onion site which has
 recently converted to 2.9.9 and Single Onions.

 There have been some strange reachability issues which I am helping
 triage.

 Analysis is tricky because independent copies of the onion exist in two
 different datacentres, and they both descriptors into the HSDirs.

 To date this configuration has not contributed to any outages that we're
 aware.

 For this ticket the specific onion address is "fbsbx2q4mvcl63pw" - though
 at least one other onion address (out of 3) has been showing the same
 symptoms.

 All onions are configured with "HiddenServiceNumIntroductionPoints 10"

 I have been monitoring the Onion descriptors with a Stem script* that
 prints the HS Descriptor IPs, and over time the listed IPs appear to drop
 from the expected 10, to as low as 4.

 Partial output from the script log, for this morning, is at:

 https://gist.github.com/alecmuffett/2910328730012f9af3410a28e5e6071e

 At 0800h the IPs in retrieved HSDescriptor (reminder: from one of two
 purposely-duplicated HS instances) looked like this, lines 1..12 in the
 Gist; note NumIntroductionPoints/nip=10

 Mon 13 Feb 2017 08:00:55 GMT
 v=2 age=55 nip=10 pub(2017-02-13 08:00:00) now(2017-02-13 08:00:55)
 fbsbx2q4mvcl63pw
         0: 134.19.177.109:443
         1: 178.254.20.134:9001
         2: 185.73.220.8:443
         3: 188.114.140.245:9001
         4: 37.187.4.8:21
         5: 46.101.102.71:443
         6: 46.4.49.201:9001
         7: 62.210.82.44:21
         8: 62.210.92.11:9001
         9: 83.44.207.3:9001

 Yet further down the file, a different descriptor, possibly from the other
 instance (lines 50-57)

 Mon 13 Feb 2017 08:21:03 GMT
 v=2 age=1263 nip=6 pub(2017-02-13 08:00:00) now(2017-02-13 08:21:03)
 fbsbx2q4mvcl63pw
         0: 188.118.217.236:443
         1: 192.42.116.161:9001
         2: 37.187.4.8:21
         3: 80.248.208.131:9001
         4: 82.165.207.102:9001
         5: 88.190.210.240:9001

 ...only 6 introduction points.

 If we assume (?) that it's unlikely for the two daemons to pick the same
 introduction point, the fact that "188.118.217.236:443" is present in all
 the descriptors in lines 40..150 suggests that all these descriptors are
 from the same daemon instance - however the number of introduction points
 varies.

 See attached image for highlight. Is this expected?

 *script: https://github.com/alecmuffett/halfagigonion/blob/master/ls-
 hsdir.py

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21446>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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