New submission from anonymous2017:

Details here: 
http://stackoverflow.com/questions/41708609/unfair-scheduling-bad-lock-optimization-in-asyncio-event-loop

Essentially there should be a `yield` before this line otherwise a coroutine 
that only acquires and releases a lock will never yield to other coroutines.

----------
components: asyncio
messages: 285688
nosy: anonymous2017, gvanrossum, yselivanov
priority: normal
severity: normal
status: open
title: asyncio.Lock.acquire() does not always yield
type: behavior
versions: Python 3.6

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29303>
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