[tor-bugs] #1936 [Tor Relay]: "All nameservers have failed" eventdns message

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#1936: "All nameservers have failed" eventdns message
---------------------------+------------------------------------------------
 Reporter:  varnav         |        Type:  defect   
   Status:  new            |    Priority:  normal   
Milestone:                 |   Component:  Tor Relay
  Version:  Tor: 0.2.1.26  |    Keywords:           
   Parent:                 |  
---------------------------+------------------------------------------------
 The symptom is messages appearing in the log after some uptime, usually
 several days:

 Sep 11 10:42:30.665 [warn] eventdns: All nameservers have failed
 Sep 11 10:42:39.684 [notice] eventdns: Nameserver 4.2.2.1 is back up
 Sep 13 08:56:58.089 [warn] eventdns: All nameservers have failed
 Sep 13 08:57:01.788 [notice] eventdns: Nameserver 4.2.2.1 is back up
 Sep 13 08:57:03.089 [warn] eventdns: All nameservers have failed
 Sep 13 08:57:12.396 [notice] eventdns: Nameserver 4.2.2.2 is back up

 After that tor process usually terminates without warning.

 There are numerous reports about this issue on the net, just if you try to
 google that log message.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/1936>
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