[tor-bugs] #17147 [Tor]: long-running client path-selection not seeing some (fast) exit nodes

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#17147: long-running client path-selection not seeing some (fast) exit nodes
---------------------------+-------------------------------
     Reporter:  starlight  |      Owner:
         Type:  defect     |     Status:  needs_information
     Priority:  normal     |  Milestone:  Tor: 0.2.???
    Component:  Tor        |    Version:  Tor: 0.2.6.10
   Resolution:             |   Keywords:
Actual Points:             |  Parent ID:
       Points:             |    Sponsor:
---------------------------+-------------------------------

Comment (by starlight):

 Think might have identified the problem.

 Looks like client-mode gets confused when the exit policy for a node
 changes.

 before

 {{{
 BabylonNetwork00 Ivn7UYzogAgbMQG3C52F1b1NeWc p reject
 22,25,109-110,119,143,563,4899,6881-6889,18353,23574,31826
 }}}

 after

 {{{
 BabylonNetwork00 Ivn7UYzogAgbMQG3C52F1b1NeWc p accept
 20-21,23,43,53,79-81,88,110,143,194,220,389,443,464-465,531,543-544,554,563,587,636,706,749,873,902-904,981,989-995,1194,1220,1293,1500,1533,1677,1723,1755,1863,2082-2083,2086-2087,2095-2096,2102-2104,3128,3389,3690,4321,4643,5050,5190,5222-5223,5228,5900,6660-6669,6679,6697,8000,8008,8074,8080,8082,8087-8088,8332-8333,8443,8888,9418,9999-10000,11371,19294,19638,50002,64738
 }}}

 First tried testing port 110, which is excluded by the old policy and
 accepted by the new policy.  This led to <path fail> displays in Vidalia
 But then also ran into port 80 failing as well.  Trace of this is attached
 to the ticket.

 Was running with UseMicrodescriptors=0 and StrictNodes=1 where the latter
 was set because the client would grab another node when BabylonNetwork00
 failed.  Think StrictNodes=0 was in effect with the port 110 fail but
 not certain.

 The exit policy change is quite recent so any other long-running client
 might exhibit the problem at the preset time.

 Have had

 {{{
 WarnPlaintextPorts ""
 WarnUnsafeSocks 0
 }}}

 at all times.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17147#comment:4>
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