[tor-bugs] #26412 [Core Tor/Stem]: KeyError in can_exit_to caused by lru_cache

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#26412: KeyError in can_exit_to caused by lru_cache
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 Reporter:  juga           |          Owner:  atagar
     Type:  defect         |         Status:  new
 Priority:  Medium         |      Milestone:
Component:  Core Tor/Stem  |        Version:
 Severity:  Normal         |     Resolution:
 Keywords:  tor-bwauth     |  Actual Points:
Parent ID:                 |         Points:
 Reviewer:                 |        Sponsor:
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Comment (by pastly):

 I'm running a little toy script that kinda sorta behaves like sbws in
 hopes that I can reproduce this. I have been doing so for 24 hours or so
 now.

 I'm also running sbws 0.4.2-dev through a very limited Tor client with
 `BandwidthRate 500 KBytes` set, and have been doing so for 24 hours.

 I'm doing all of this with Python 3.4.8, 3.5.3, and 3.6.5.

 I will do this for a few more days. If I don't get these errors, I will
 switch sbws to the version it was at when these KeyErrors were happening.
 Of note, at that time we were getting exit policies from micro descriptors
 but now we get them from server descriptors.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26412#comment:2>
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