pyzmq 26, Windows 11: Bad file descriptor

[malgarop]

This is a pyzmq bug

• This is a pyzmq-specific bug, not an issue of zmq socket behavior. Don't worry if you're not sure! We'll figure it out together.

What pyzmq version?

26.0.0

What libzmq version?

none

Python version (and how it was installed)

3.12.3

OS

windows 11

What happened?

When installing jupyter on a new windows machine, it will fail to connect to any python3 kernel, with the following error popup: "Error Starting KernelNetworkError when attempting to fetch resource."

To reproduce:
On a Powershell on a Windows 11 machine with python 3.12.3:

'pip install jupyter'
'python -m jupyter notebook' or 'jupyter-lab'
start a new notebook, or open an existing one, with python3 kernel
process fails and error pops up. In the shell I get the following output:
"Bad file descriptor (C:\Users\runneradmin\AppData\Local\Temp\tmp9czwcdbh\build_deps\bundled_libzmq-src\src\epoll.cpp:73)"

It works after I uninstall pyzmq and reinstall the Dec 5, 2023 version:

'pip freeze | findstr pyzmq'
output: "pyzmq==26.0.0"
'pip uninstall pyzmq'
'pip install pyzmq==25.1.2'

Code to reproduce bug

pip install jupyter
python -m jupyter notebook' or 'jupyter-lab

Traceback, if applicable

Bad file descriptor (C:\Users\runneradmin\AppData\Local\Temp\tmp9czwcdbh\build_deps\bundled_libzmq-src\src\epoll.cpp:73)

More info

No response

[minrk]

Can I ask how you installed pyzmq and Python? Do you have any other Python versions available to test?

Can you run a basic script like:

import zmq
ctx = zmq.Context()
with ctx:
    with ctx.socket(zmq.PUSH) as s:
        s.bind("tcp://127.0.0.1:5555")

[grvstick]

same issue here. FYI @minrk, I've just run your code to confirm.

import zmq
ctx = zmq.Context()
with ctx:
    with ctx.socket(zmq.PUSH) as s:
        s.bind("tcp://127.0.0.1:5555")

Bad file descriptor (C:\Users\runneradmin\AppData\Local\Temp\tmpuk6z2au_\build\_deps\bundled_libzmq-src\src\epoll.cpp:73)

Also using python 3.12.3 via microsoft store(WIN 11)

[malgarop]

@minrk thanks for your patience, running the scripts you suggested results in:
Bad file descriptor (C:\Users\runneradmin\AppData\Local\Temp\tmps23b75cz\build\_deps\bundled_libzmq-src\src\epoll.cpp:73)

I installed python via Mirosoft store on windows 11. Python pip installed pyzmq for me as a dependency for the module jupyter

[minrk]

Interesting that you both got it via the Store. Do you have access to another source, e.g. a miniconda install or Python.org installer? Just to test if it's related to the Python installation instead of the environment?

[grvstick]

@minrk just confirmed that it does not happen with python.org release of 3.12.3, both on jupyter lab and the test code you provided. I've failed to test conda, since jupyter is only seems to be able to run in conda packages, not pip. I wanted to test in pyzmq >= 26.0.0