[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
---------------------------+------------------------
 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:
---------------------------+------------------------
Description changed by juga:

Old description:

> As pastly reported in https://github.com/pastly/simple-bw-
> scanner/issues/198,
> stem giving this traceback:
>
> `File "/home/pastly/src/simple-bw-scanner/venv-editable/lib/python3.5
> /site-packages/stem/exit_policy.py", line 285, in can_exit_to`
>
> `if not self.is_exiting_allowed():KeyError:
> (<stem.exit_policy.MicroExitPolicy object at 0x7f8de6438ba8>,)`
>
> Apparently caused by  a Python bug with `lru_cache`.
>
> pastly is already trying to find out which Python versions fail, to use
> `stem`'s `lru_cache` for those ones.

New description:

 As pastly reported in https://github.com/pastly/simple-bw-
 scanner/issues/198,
 stem giving this traceback:

 `File "/home/pastly/src/simple-bw-scanner/venv-editable/lib/python3.5
 /site-packages/stem/exit_policy.py", line 285, in can_exit_to`

 `if not self.is_exiting_allowed():KeyError:
 (<stem.exit_policy.MicroExitPolicy object at 0x7f8de6438ba8>,)`

 Apparently caused by  a Python bug with `lru_cache`.

 pastly is already trying to find out which Python versions fail, to use
 `stem`'s `lru_cache` for those ones.

 This ticket blocks #26848

 Edit: blocks ticket

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26412#comment:7>
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