New submission from Sebastien Bourdeauducq:
1. Open a listening socket:
$ nc6 -l -p 1066
2. Run the following (tested here on Linux):
import asyncio
async def bug():
reader, writer = await asyncio.open_connection("::1", "1066")
while True:
writer.write("foo\n".encode())
await writer.drain()
# Uncommenting this makes drain() raise BrokenPipeError
# when the server closes the connection.
#await asyncio.sleep(0.1)
loop = asyncio.get_event_loop()
loop.run_until_complete(bug())
3. Terminate netcat with Ctrl-C. The program will go on a endless loop of
"socket.send() raised exception." as writer.drain() fails to raise an exception
to report the closed connection. Reducing the output rate of the program by
using asyncio.sleep causes writer.drain() to raise BrokenPipeError (and
shouldn't it be ConnectionResetError?)
----------
components: asyncio
messages: 253181
nosy: gvanrossum, haypo, sebastien.bourdeauducq, yselivanov
priority: normal
severity: normal
status: open
title: StreamWriter.drain() unreliably reports closed sockets
versions: Python 3.5
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25441>
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