STINNER Victor added the comment:
Attached patch fixes the issue, but it has no unit test :-(
On Windows, it looks like IocpProactor can also raise an error if the timeout
is too large:
# GetQueuedCompletionStatus() has a resolution of 1 millisecond,
# round away from zero to wait *at least* timeout seconds.
ms = math.ceil(timeout * 1e3)
if ms >= INFINITE:
raise ValueError("timeout too big")
with INFINITE = 0xffffffff.
----------
keywords: +patch
nosy: +gvanrossum, neologix
Added file: http://bugs.python.org/file33880/asyncio_timeout_overflow.patch
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