[tor-bugs] #28772 [Core Tor/Tor]: DNS resolver at DNSPort stops working after some time, while tor is working. Only restart helps.

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#28772: DNS resolver at DNSPort stops working after some time, while tor is
working. Only restart helps.
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 Reporter:  toruser787                    |          Owner:  (none)
     Type:  defect                        |         Status:  new
 Priority:  Immediate                     |      Component:  Core Tor/Tor
  Version:  Tor: 0.3.5.5-alpha            |       Severity:  Blocker
 Keywords:  dns bug fail restart dnsport  |  Actual Points:
Parent ID:                                |         Points:
 Reviewer:                                |        Sponsor:
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 Hello. I am tor user more than 6 years. And always this problem existed.
 Now I am totally tired and decided to fill a bug. I am using always latest
 versions, now at 0.3.5.5 and on android the same, latest 0.3.* version.

 I use DNSPort option and route all my DNS traffic to it. After tor is
 connected, it is working well, but after some time (2-5-10 hours), it stop
 to work and return no IP address to any DNS request, while the tor itself
 continue working, log don't show anything relevant. DNS requests resolve
 only internally through socks port.

 This happens many years to me, and only restarting tor helps to get my DNS
 back.
 I even tried to open multiple DNSresolvers, like
 DNSPort 127.0.0.2:53
 DNSPort 127.0.0.3:53
 DNSPort 127.0.0.4:53

 and put them all to /etc/resolv.conf, and it helped to keep it running
 more long, but anyway after some time they all stops resolving.

 On android I have the same issue. I rerouted all DNS traffic to it, and
 after some hours only restarting to service works. I even thought to write
 some script, if domain fails to resolve, restart to service...

 Please help! DNSPort resolver must recreate it's circuits if they fails.
 and don't wait for hard reset.
 Thank you!

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28772>
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