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

Tor Bug Tracker & Wiki blackhole at torproject.org
Fri Nov 11 06:42:29 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 teor):

 Ok, so #20610 deals with the excessive logging part of this issue, #19974
 deals with the monotonic time part of this issue.

 I suspect that `[warn] assign_to_cpuworker failed. Ignoring.` is a symptom
 of the host name lookup timeout. So I've retitled this issue to focus on
 the hostname lookup timeout.

 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.

 Alternately, we could log a message when tor_addr_lookup() takes more than
 N seconds, encouraging relay operators to set 'Address', modify /etc/hosts
 and /etc/hostname, or use IP addresses rather than hostnames in their
 config.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20423#comment:28>
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