Message 318876 - Python tracker

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Author	vstinner
Recipients	asvetlov, pablogsal, vstinner, yselivanov
Date	2018-06-07.02:52:02
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1528339922.49.0.592728768989.issue33694@psf.upfronthosting.co.za>
In-reply-to

Content
Something else. The bug occurs when CancelIoEx() (on the current overlapped WSARecv()) fails internally with ERROR_NOT_FOUND. According to overlapped.c, it means: /* CancelIoEx returns ERROR_NOT_FOUND if the I/O completed in-between */ HasOverlappedIoCompleted() returns 0 in that case. The problem is that currently, Overlapped.cancel() also returns None in that case, and later the asyncio IOCP loop ignores the completion event and so drops incoming received data.

Something else. The bug occurs when CancelIoEx() (on the current overlapped WSARecv()) fails internally with ERROR_NOT_FOUND. According to overlapped.c, it means:

/* CancelIoEx returns ERROR_NOT_FOUND if the I/O completed in-between */

HasOverlappedIoCompleted() returns 0 in that case.

The problem is that currently, Overlapped.cancel() also returns None in that case, and later the asyncio IOCP loop ignores the completion event and so drops incoming received data.

History
Date	User	Action	Args
2018-06-07 02:52:02	vstinner	set	recipients: + vstinner, asvetlov, yselivanov, pablogsal
2018-06-07 02:52:02	vstinner	set	messageid: <1528339922.49.0.592728768989.issue33694@psf.upfronthosting.co.za>
2018-06-07 02:52:02	vstinner	link	issue33694 messages
2018-06-07 02:52:02	vstinner	create