[issue39116] StreamReader.readexactly() raises GeneratorExit on ProactorEventLoop

[twisteroid ambassador]

twisteroid ambassador <twisteroid.ambassador at gmail.com> added the comment:

I have attached a script that should be able to reproduces this problem. It's not a minimal reproduction, but hopefully easy enough to trigger.

The script is a SOCKS5 proxy server listening on localhost:1080. In its current form it does not need any external dependencies. Run it on Windows 10 + Python 3.9, set a browser to use the proxy server, and browse a little bit, it should soon start printing mysterious errors involving GeneratorExit.

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Added file: https://bugs.python.org/file49532/prettysocks.py

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<https://bugs.python.org/issue39116>
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