[tor-relays] eventdns: Address mismatch on received DNS packet.

[s7r]

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We have a ticket open for this:

https://trac.torproject.org/projects/tor/ticket/11600

I think this is a libevent error.

It happened to me on FreeBSD 10 with Bind910, FreeBSD 10 with Unbound,
Debian Wheezy with Unbound, Debian Wheezy with Bind, Debian Wheezy
with ISP-assigned-resolvers (pretty much everything). Happened
initially on Tor 0.2.4.21, followed to all upgrades of 0.2.4.x series
and also happens currently on 0.2.5.10, but on the latest version the
error appears not to occur as often as it used to in 0.2.4.x series.

On 2/21/2015 4:06 AM, Sebastian Urbach wrote:
> On February 21, 2015 2:09:48 AM Libertas <libertas at mykolab.com>
> wrote:
> 
> Hi,
> 
>> On 02/20/2015 06:31 PM, Jacob Corbin wrote:
>>> I'm sorry for the late reply on this but I've been having
>>> problems
>> with my
>>> Internet connection and am trying to catch up on emails. I've
>>> never
>> received
>>> that message but months ago I started getting messages in the
>>> posts you referenced like:
>>> 
>>> Jan 05 12:36:58.138 [warn] eventdns: All nameservers have
>>> failed Jan 05 12:36:58.354 [notice] eventdns: Nameserver
>>> 192.0.2.7 is back up
>> 
>> I get this constantly on my exit node running OpenBSD with a
>> local Unbound caching DNS server. I think libevent (this is part
>> of libevent, right?) is just a little too trigger-happy with
>> reporting DNS requests as failed, as my failures never last more
>> than a second. I was considering opening a ticket about this.
> 
> Unbound at Debian here, the same effect. Thanks in advance if you do
> open a ticket.
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