[tor-bugs] #27066 [Core Tor/Tor]: circuit_build_times_update_alpha(): Bug: Could not determine largest build time

[Tor Bug Tracker & Wiki]

#27066: circuit_build_times_update_alpha(): Bug: Could not determine largest build
time
---------------------------------------+-----------------------------------
 Reporter:  cstest                     |          Owner:  (none)
     Type:  defect                     |         Status:  new
 Priority:  Medium                     |      Milestone:  Tor:
                                       |  0.3.5.x-final
Component:  Core Tor/Tor               |        Version:  Tor: 0.3.3.9
 Severity:  Normal                     |     Resolution:
 Keywords:  034-backport 033-backport  |  Actual Points:
Parent ID:                             |         Points:
 Reviewer:                             |        Sponsor:
---------------------------------------+-----------------------------------

Comment (by mikeperry):

 Ok based on the above, my suspicions are accumulating around some kind of
 interaction between timed out circuits and the circuit failure limit,
 which would explain why your services stop working. I do not know where
 this CBT error is coming from though. #27049 is one way that it can
 happen, but if there are no loglines related to that, then something else
 must be happening.

 I also do not know why this limit is only affecting v3 services. Perhaps
 there is some v3-specific code that counts failures differently than v2.

 Are you able to run branches with additional logging and/or potential
 fixes? I have been unable to reproduce this on a v3-only service that is
 under continual use via synthetic wget activity.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27066#comment:7>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online