STINNER Victor added the comment:

Errors in the traceback module (caused by linecache) are common when working on 
the asyncio module in debug mode. The asyncio tries to log exceptions at exit 
to help the debug to track bugs. It uses the garbage collector and destructors 
on objects. Example of debug tool:
https://docs.python.org/dev/library/asyncio-dev.html#detect-exceptions-never-consumed

See for examples issues #22428 and #22480.

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<http://bugs.python.org/issue22599>
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