STINNER Victor <vstin...@redhat.com> added the comment:
Interesting commit. No idea if it's related.
commit 79790bc35fe722a49977b52647f9b5fe1deda2b7
Author: Victor Stinner <vstin...@redhat.com>
Date: Fri Jun 8 00:25:52 2018 +0200
bpo-33694: Fix race condition in asyncio proactor (GH-7498)
The cancellation of an overlapped WSARecv() has a race condition
which causes data loss because of the current implementation of
proactor in asyncio.
No longer cancel overlapped WSARecv() in _ProactorReadPipeTransport
to work around the race condition.
Remove the optimized recv_into() implementation to get simple
implementation of pause_reading() using the single _pending_data
attribute.
Move _feed_data_to_bufferred_proto() to protocols.py.
Remove set_protocol() method which became useless.
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<https://bugs.python.org/issue32710>
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