Something is setting the result on a completed task?

• asyncpg version: 0.22.0+ (at commit 075114c195e9eb4e81c8365d81540beefb46065c)
• PostgreSQL version: CockroachDB v20.2.3
• Do you use a PostgreSQL SaaS? If so, which? Can you reproduce
  the issue with a local PostgreSQL install?: not a SaaS, we do our own deployments
• Python version: Python 3.9.1
• Platform: Linux
• Do you use pgbouncer?: no
• Did you install asyncpg with pip?: yes but from the git repo, to get the latest fixes
• If you built asyncpg locally, which version of Cython did you use?:
• Can the issue be reproduced under both asyncio and
  uvloop?: for now I've seen this under uvloop

protocol: <asyncpg.connect_utils.TLSUpgradeProto object at 0x7f3f453f9340>
transport: <TCPTransport closed=False reading=False 0x556958f834a0>
Traceback (most recent call last):
  File "uvloop/handles/stream.pyx", line 829, in uvloop.loop.__uv_stream_on_read_impl
  File "/root/aurora-extract/src/asyncpg/asyncpg/connect_utils.py", line 516, in data_received
    self.on_data.set_result(True)
asyncio.exceptions.InvalidStateError: invalid state```

从 asyncpg/connect_utils.py:516 开始，这里 TLSUpgradeProto.data_received 调用 self.on_data.set_result(True)，并追踪该 task 在 uvloop 下何时完成。如果可能，使用 CockroachDB 重现报告的 InvalidStateError；完成的标准是 TLS upgrade 不再尝试为一个已经完成的 task 设置结果。