MagicStack / MagicStack/uvloop

unable to perform operation on <WriteUnixTransport closed=True reading=False 0x7f16825f8ba0

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Description

  • uvloop version: 0.17.0
  • Python version: 3.10.7
  • Platform: ubuntu 20.04
  • Can you reproduce the bug with PYTHONASYNCIODEBUG in env?: yes
  • Does uvloop behave differently from vanilla asyncio? How?: yes
Traceback (most recent call last):
  File "/usr/local/lib/python3.10/dist-packages/pytgcalls/methods/groups/join_group_call.py", line 275, in internal_sender
    await self._binding.send(request)
  File "/usr/local/lib/python3.10/dist-packages/pytgcalls/binding.py", line 212, in send
    await self._send({
  File "/usr/local/lib/python3.10/dist-packages/pytgcalls/binding.py", line 221, in _send
    self._js_process.stdin.write(
  File "/usr/lib/python3.10/asyncio/streams.py", line 326, in write
    self._transport.write(data)
  File "uvloop/handles/stream.pyx", line 674, in uvloop.loop.UVStream.write
  File "uvloop/handles/handle.pyx", line 159, in uvloop.loop.UVHandle._ensure_alive
RuntimeError: unable to perform operation on <WriteUnixTransport closed=True reading=False 0x7f16825f8ba0>; the handler is closed

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  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 in uvloop/handles/stream.pyx and uvloop/handles/handle.pyx, then compare the reported behavior with Python's asyncio streams. Reproduce the closed WriteUnixTransport failure using the provided uvloop, Python, and Ubuntu versions; done means the differing behavior is isolated and covered by a regression test.

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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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