[tor-bugs] #20423 [Core Tor/Tor]: Clock jumps on FreeBSD relay due to hostname lookup timeouts

Mon Nov 14 13:59:45 UTC 2016

#20423: Clock jumps on FreeBSD relay due to hostname lookup timeouts
--------------------------------+------------------------------------
 Reporter:  Felixix             |          Owner:
     Type:  defect              |         Status:  new
 Priority:  High                |      Milestone:  Tor: 0.2.9.x-final
Component:  Core Tor/Tor        |        Version:  Tor: 0.2.8.9
 Severity:  Normal              |     Resolution:
 Keywords:  regression freebsd  |  Actual Points:
Parent ID:                      |         Points:
 Reviewer:                      |        Sponsor:
--------------------------------+------------------------------------

Comment (by nickm):

 Replying to [comment:28 teor]:
 > We could improve this issue by avoiding calling getaddrinfo() or
 gethostbyname() so often (although it's only being called once per hour,
 which is probably the right frequency), or by somehow putting a lower
 timeout on it, or by calling it asynchronously.

 I think that "calling it asynchronously" is the right answer. We could do
 that either from a job that we pass to a worker thread, or using
 libevent's evdns resolver.  (I believe that might not initialize the
 libevent evdns resolver very well, though, so the "use a worker" thing
 might be a better option)

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20423#comment:29>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online