[issue32710] test_asyncio: ProactorEventLoopTests sendfile tests leak references on Windows

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

It took me 1 year, a few sleepless nights, multiple attempts to understand the leak, but I eventually found it! WSASend() doesn't release the memory if it fails immediately. I wrote PR 11469 to fix the memory leak. ReadFile() has the same bug, I also fixed it.

By the way, the _overlapped.Overlapped type has no traverse function: it may help the garbage collector to add once, since asyncio is famous for building reference cycles by design (Future.set_exception()).

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<https://bugs.python.org/issue32710>
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