MagicStack / MagicStack/uvloop

RuntimeError: File descriptor 2877 is used by transport <TCPTransport closed=False reading=True 0x55b8dc9baa90>

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Description

In our service we had aiohttp==3.8.5 and upgraded aiohttp to 3.10.5 version. That is all. In production now we have issues like issue below.
Maybe i should to write issue to another libs, tell me about it if so, or maybe you have your own fix then tell me uvloop version i need to upgrade in my service.

traceback:

```
RuntimeError: File descriptor 2877 is used by transport
File "our_service/app/client.py", line 204, in get_recommendations
async with self._session.get(
File "aiohttp/client.py", line 1353, in __aenter__
self._resp = await self._coro
File "aiohttp/client.py", line 657, in _request
conn = await self._connector.connect(
File "aiohttp/connector.py", line 564, in connect
proto = await self._create_connection(req, traces, timeout)
File "aiohttp/connector.py", line 975, in _create_connection
_, proto = await self._create_direct_connection(req, traces, timeout)
File "aiohttp/connector.py", line 1319, in _create_direct_connection
transp, proto = await self._wrap_create_connection(
File "aiohttp/connector.py", line 1073, in _wrap_create_connection
sock = await aiohappyeyeballs.start_connection(
File "aiohappyeyeballs/impl.py", line 104, in start_connection
raise first_exception
File "aiohappyeyeballs/impl.py", line 82, in start_connection
sock = await _connect_sock(
File "aiohappyeyeballs/impl.py", line 174, in _connect_sock
await loop.sock_connect(sock, address)
File "uvloop/loop.pyx", line 2631, in sock_connect
fut = self._sock_connect(sock, address)
File "uvloop/loop.pyx", line 1089, in uvloop.loop.Loop._sock_connect
self._add_writer(sock, handle)
File "uvloop/loop.pyx", line 837, in uvloop.loop.Loop._add_writer
self._ensure_fd_no_transport(fd)
File "uvloop/loop.pyx", line 764, in uvloop.loop.Loop._ensure_fd_no_transport
raise RuntimeError(
```

python version:
Python 3.10.15

os info:
PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"
NAME="Debian GNU/Linux"
VERSION_ID="12"
VERSION="12 (bookworm)"
VERSION_CODENAME=bookworm
ID=debian

other installed libs:
aiohttp==3.10.5
aiohttp_traversal==0.11.0
aiojobs==1.2.0
asyncpg==0.29.0
orjson==3.9.10
uvloop==0.19.0
yarl==1.12.1

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the traceback entry points in uvloop/loop.pyx, especially _ensure_fd_no_transport and _add_writer, then compare them with aiohttp/connector.py and aiohappyeyeballs/impl.py for the reported dependency versions. Reproduce the file-descriptor conflict using Python 3.10.15 on Debian 12 with uvloop 0.19.0 and aiohttp 3.10.5; done means identifying a reproducible cause and providing a regression test or documented compatibility fix.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
networking
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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