New submission from Alexander Riccio <test35...@gmail.com>:

I compiled PCBuild Debug x64 from an updated clone of upstream, and when 
running the testsuite under Application Verifier with handle verification, the 
test triggers an invalid handle access by passing an invalid overlapped handle 
to CancelIoEx with this code: Py_CancelIoEx(self->handle, &self->overlapped) 
(where self->handle appears to be the offending variable).

I have no idea who's calling _overlapped.cancel, and a quick spelunking through 
the codebase only confuses me more.

----------
components: Tests
files: python_test_invalid_handle_failure.TXT
messages: 341365
nosy: Alexander Riccio
priority: normal
severity: normal
status: open
title: test_asyncio fails with application verifier!
versions: Python 3.8
Added file: 
https://bugs.python.org/file48298/python_test_invalid_handle_failure.TXT

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<https://bugs.python.org/issue36790>
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