[tor-bugs] #22690 [Core Tor/Tor]: SR: Authorities can add a reveal to their own vote, but expect a commit in all votes

Tor Bug Tracker & Wiki blackhole at torproject.org
Thu Jun 22 12:55:28 UTC 2017


#22690: SR: Authorities can add a reveal to their own vote, but expect a commit in
all votes
--------------------------+------------------------------------
 Reporter:  teor          |          Owner:
     Type:  defect        |         Status:  needs_information
 Priority:  Medium        |      Milestone:  Tor: 0.3.2.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  tor-sr        |  Actual Points:
Parent ID:                |         Points:  2
 Reviewer:                |        Sponsor:
--------------------------+------------------------------------

Comment (by teor):

 Replying to [comment:2 dgoulet]:
 > This is possible with a bad clock on the authority side which makes the
 relay thinks that it's in the REVEAL phase but it is in fact in the COMMIT
 phase.
 >
 > A bit weird though that you get that on chutney because all relays have
 the same clock! The logs here will definitely help out.

 chutney does some weird things with TestingV3AuthVotingStartOffset that
 might cause this issue. Occasionally one authority starts before the
 offset, and another starts after it, and their consensuses get out of
 sync.

 But this is really weird: it is an authority rejecting its own vote, so it
 has to have the same clock, right?

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22690#comment:3>
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