[issue27585] asyncio.Lock deadlock after cancellation

[sss]

sss added the comment:

Yes, await asyncio.sleep(0) does fix it, but it would be weird if I'm supposed to put those all over my code. I made a new reproducer now that uses 2 threads in case it's not allowed to take the same lock twice from the same thread.

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Added file: http://bugs.python.org/file44007/lock2.py

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