[issue23095] asyncio: race condition when cancelling a _WaitHandleFuture

[STINNER Victor]

STINNER Victor added the comment:

The race condition occurs when _WaitHandleFuture().cancel() is called. This 
object is created by IocpProactor.wait_for_handle().

_WaitHandleFuture().cancel() is only called by 4 tests:

- test_cancel_post_init()
- test_cancel_make_subprocess_transport_exec
- test_wait_for_handle
- test_wait_for_handle_cancel

It looks like the "GetQueuedCompletionStatus() returned an unexpected event" 
error is logged when test_wait_for_handle() and/or 
test_wait_for_handle_cancel() is executed(). Disabling these tests is enough to 
workaround this issue.

Using Tulip, use "python3 runtests.py -r" to reproduce the issue. You may have 
to run this command multiple times to see the error, the bug is random.

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[issue23095] asyncio: race condition when cancelling a _WaitHandleFuture

[STINNER Victor]

Changes by STINNER Victor :


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title: asyncio: race condition in IocpProactor.wait_for_handle() -> asyncio: 
race condition when cancelling a _WaitHandleFuture

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