Something is setting the result on a completed task?

[ale-dd]

• asyncpg version: 0.22.0+ (at commit 075114c)
• 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```

[mecampbellsoup]

Also seeing this, and also under uvloop.

[w-miller]

I've created a PR to fix this

[AndrewJackson2020]

Encountered this issue as well. Would be nice to see #1117 or another fix merged.

[Jdyn]

Encountering this as well, is there any particular application pattern that could cause this to occur?