[tor-bugs] #24991 [Core Tor/Tor]: relay frequently claiming "missing descriptors for 1/2 of our primary entry guards"

[Tor Bug Tracker & Wiki]

#24991: relay frequently claiming "missing descriptors for 1/2 of our primary entry
guards"
-------------------------------------------------+-------------------------
 Reporter:  alecmuffett                          |          Owner:  (none)
     Type:  defect                               |         Status:
                                                 |  needs_information
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.3.0.1-alpha
 Severity:  Minor                                |     Resolution:
 Keywords:  single-onion, guards, logging,       |  Actual Points:
  easy, 034-triage-20180328,                     |
  034-removed-20180328                           |
Parent ID:  #23863                               |         Points:  0.5
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by starlight):

 Issue arrived, EDT:

 Jun 1 08:04:48 Tor[]: Our directory information is no longer up-to-date
 enough. . .
 Jun 1 08:04:48 Tor[]: I learned some more directory information. . .
 Jun 1 08:04:48 Tor[]: We now have enough directory information to build
 circuits.

 Provided debug log off-ticket due to sensitive content and difficulty of
 obfuscation.  Will provide to any interested dev.

 Looking it over, seems to me the authorities prepare consensus diff
 documents a couple of times each hour and about 50 or so generally arrive.
 Appears some descriptors are overlooked (rather odd odd, perhaps a bug),
 and curiously the handful of missing descriptors contains one of the
 relay's guard nodes about once a day.  The relay requests the missing/out-
 of-date descriptors which arrive shortly and repair the deficit.  What's
 strange is after performing DROPGUARDS it kept happening, implying that a
 significant percentage of guards fall into the "overlooked" group any
 given day.  This is casual observation and could be quite wrong--did not
 delve into it deeply.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24991#comment:17>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online