[tor-bugs] #28860 [Core Tor/Tor]: Increased DNS failure rate when using ServerDNSResolvConfFile with tor 0.3.4.9 (as opposed to 0.3.3.x)

[Tor Bug Tracker & Wiki]

#28860: Increased DNS failure rate when using ServerDNSResolvConfFile with tor
0.3.4.9 (as opposed to 0.3.3.x)
-------------------------------------------------+-------------------------
 Reporter:  nusenu                               |          Owner:  (none)
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-dns, regression,                 |  Actual Points:
  040-deferred-20190220                          |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by cypherpunks):

 DNS:
 {{{
 Tor Exit Failures

 Average probability-weighted failure rate: 7.1%

 Test ran at 2019-07-12 12:14:00 UTC
 }}}
 7.1%!!!

 Top-5 bad exits are on Tor 0.4.0.5!
 {{{
 failure_rate    connection_time nickname        fingerprint     as_name
 country_name    contact platform        bandwidth_rate  exit_probability
 80.0    0.8471200466156006      renewablefreedom
 CA94704217260E7483DA88719CACD7A94C564D5C        Zwiebelfreunde e.V.
 Germany https://www.torservers.net/donate.html <support .AT. torservers
 .DOT. net>      Tor 0.4.0.5 on Linux    52428800        0.005871822
 80.0    0.7933343648910522      iVPN
 A2534EF23390CAE079B1586F0FDF9CE11F556062        Zwiebelfreunde e.V.
 Germany https://www.torservers.net/donate.html <support .AT. torservers
 .DOT. net>      Tor 0.4.0.5 on Linux    52428800        0.0056790924
 80.0    0.8955183029174805      RSFPressFreedom
 A2DB293FFC5A76A718863BF1AEDBC8DFB1CB1097        Zwiebelfreunde e.V.
 Germany Exit by Reporters without Borders via https://www.torservers.net/
 Tor 0.4.0.5 on Linux    52428800        0.0055955765
 80.0    0.8538782596588135      AnosognosiaRedux
 D6D6B6614C9EF2DAD13AC0C94487AD8ED3B6877F        Zwiebelfreunde e.V.
 Germany https://www.torservers.net/donate.html <support .AT. torservers
 .DOT. net>      Tor 0.4.0.5 on Linux    52428800        0.005524909
 90.0    1.153367280960083       HSLtor
 E43A346CB81DDF364B6FF68235AFADBA0E8692B8        Zwiebelfreunde e.V.
 Germany https://www.torservers.net/donate.html <support .AT. torservers
 .DOT. net>      Tor 0.4.0.5 on Linux    31457280        0.0048182346
 70.0    3.1669646898905435      dorrisdeebrown
 FDAED15C98CFE7A416E5676F614254F78406105C        Zwiebelfreunde e.V.
 Germany https://www.torservers.net/donate.html <support .AT. torservers
 .DOT. net>      Tor 0.4.0.5 on Linux    52428800        0.0060902485
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28860#comment:6>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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