[issue29930] Waiting for asyncio.StreamWriter.drain() twice in parallel raises an AssertionError when the transport stopped writing

[Aymeric Augustin]

Aymeric Augustin added the comment:

I worked around this bug in websockets by serializing access to `drain()` with a lock:

https://github.com/aaugustin/websockets/commit/198b71537917adb44002573b14cbe23dbd4c21a2

I suspect this is inefficient but it beats crashing.

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<https://bugs.python.org/issue29930>
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