Pathlib throws "Bad file descriptor", but only with `uvloop`.

[decorator-factory]

• uvloop version: 0.15.3
• Python version: 3.9.5
• Platform: Manjaro, kernel is 5.10.42-1
• Can you reproduce the bug with PYTHONASYNCIODEBUG in env?: no
• Does uvloop behave differently from vanilla asyncio? How?: without uvloop, the script works just fine.

When spawning processes and creating file, an OSError: [Errno 9] Bad file descriptor sometimes appears.

Script and output: https://gist.github.com/decorator-factory/6b5276ab5fb87f4c009f1d22dc4b20a9

Sometimes it also just hangs, with 0 CPU consumption. When I press CTRL+C, I get this traceback: https://gist.github.com/decorator-factory/888a584cbc4d44600ea62f5e7e344b66

Sometimes it completes successfully.

[graingert]

Is this fixed by #408 ?

[decorator-factory]

Is this fixed by #408 ?

Doesn't seem to be, I just tested on 0.15.3, and I get the same results

[decorator-factory]

Update: on 16.0 I no longer get the core dump, but the 'bad file descriptor' persists. I wonder if there's something wrong with my system, is there some way to debug the system side of file descriptors?

[th3hamm0r]

Fyi: I don't know if this is related to that issue, but we see similar log entries of Error while closing socket [Errno 9] Bad file descriptor logged by gunicorn in our django setup with gunicorn, uvicorn, uvloop, websockets, when the server is shutting down. Tested with the latest version of uvloop, uvicorn etc.

[shughes-uk]

We are seeing this a lot with asyncio.create_subprocess_exec . Guincorn + uvicorn workers + uvloop+ websockets. Also passing it Path objects and not strings

proc = await asyncio.create_subprocess_exec(
File "/opt/conda/lib/python3.8/asyncio/subprocess.py", line 236, in create_subprocess_exec
transport, protocol = await loop.subprocess_exec(
File "uvloop/loop.pyx", line 2793, in subprocess_exec
File "uvloop/loop.pyx", line 2751, in __subprocess_run
File "uvloop/handles/process.pyx", line 597, in uvloop.loop.UVProcessTransport.new
File "uvloop/handles/process.pyx", line 127, in uvloop.loop.UVProcess._init
OSError: [Errno 9] Bad file descriptor

[graingert]

@decorator-factory can you try my patch #466 ?

[shughes-uk]

Yes I’ll putt this through it’s paces and report back

…

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[decorator-factory]

@graingert Yes this fixes it for me. Thanks for finding the issue

[cbay]

@graingert I can confirm that your one-liner fixes the issue for me as well. I've been running my application for the last few days with your fix, and I haven't had any OSError: [Errno 9] Bad file descriptor since (I had dozens every day before).

Thanks!