Windows Python wheels: Bad address src\epoll.cpp:100

[zhanggyarcher]

Hello, recently I set up a new python environment on a new computer as usual, I got automatically installed pyzmq==21.0.2, and I cannot use jupyter notebook, Jupyter lab, vs code at all, the python kernel crashes every time when I open a editor, and after one second, it directly crashes and lose connection to the kernel.

This problem annoyed me for several weeks, and today I saw many people encountered this issue From December 2020 to January 2021. And I have never encountered this issue in the past.

Also, this error message is somewhat not useful and not making sense, finally I realized its pyzmq error.
I degraded it to pyzmq==19.0.2 , it finally resolved this issue.

I hope this could be fixed, or if you could push old versions of pyzmq for users to install as dependencies.
Thank you very much!

[minrk]

Can you test with current pyzmq 22.0.2? As far as I am aware, all of these issues are fixed in the latest release.

pyzmq has no control over error messages from the C runtime thrown by the underlying libzmq.

[zhanggyarcher]

Can you test with current pyzmq 22.0.2? As far as I am aware, all of these issues are fixed in the latest release.

pyzmq has no control over error messages from the C runtime thrown by the underlying libzmq.

Sure, I will have a look and let you know. But could you stop letting them push 21.0.2 as dependencies? Thanks!

[minrk]

But could you stop letting them push 21.0.2 as dependencies?

Who are 'they'? If you pip install pyzmq you should get 22.0.2. That's all I have control over.

[zhanggyarcher]

But could you stop letting them push 21.0.2 as dependencies?

Who are 'they'? If you pip install pyzmq you should get 22.0.2. That's all I have control over.

When I install pyzmq==22.0.2, it still has this crash problem. Then I reverted to 19.0.2, the problem resolved. Everything is working fine.

When I check dependency list, ipykernel is calling to install pyzmq, when user is installing jupyter or jupyter-lab, pyzmq==21.0.2 is automatically installed, so I hope you could let them to install pyzmq==19.0.2, not the later version.
Thank you!

[minrk]

Thank you for testing and confirming this is an issue in the current version!

Can you run:

python3 -m pip install pytest pyzmq==22.0.2
python3 -m pytest -v -m "not wheel and not new_console" --pyargs zmq.tests

and share the output?

Also, can you share some more information about your environment, so I can learn a bit about what makes your environment different from all of our tests?

• Windows Version
• Python version, and how it is installed (from Python.org, conda-forge, etc.)

@bluca any hints as to why this epoll_ctl assert would fail on Windows? This is using the libzmq-v141-x64-4_3_4 artifact on bintray.

so I hope you could let them to install pyzmq==19.0.2, not the later version.

I'm sorry, I really don't know what you mean by this. Anyone is free to install any version, so this is already the case.

[bluca]

• Windows Version
• Python version, and how it is installed (from Python.org, conda-forge, etc.)

@bluca any hints as to why this epoll_ctl assert would fail on Windows? This is using the libzmq-v141-x64-4_3_4 artifact on bintray.

Sorry, don't know - maybe @sigiesec can help

[zhanggyarcher]

@minrk Sorry for the late reply, I will try my best to test these on a new computer as soon as I can(to avoid damaging my environment).
For this issue, I encontered on Windows 10 1909, 20H2, python 3.6.8, 3.7.9, 3.8.6, 3.8.7, so this is not only the issue for python 3.6. So I am not sure the modified title for this issue is suitable or not. And I tried all these versions and I reinstalled windows10 and the python environment more than 20 times, this issue always appear.
I installed python 3.6.8 or other versions via windows x86_64 installer, and then I use pip to install these packages sequentially: tensorflow, tensorflow-gpu, matplotlib, scipy,scikit-learn,torch, jupyterlab. As what I said above, the jupyter need ipykernel, and ipykernel needs pyzmq. When I install jupyterlab or jupyter-notebook, it automatically install ipykernel and automatically install pyzmq=21.0.2, I have no choice. And many users don't know they installed pyzmq, and they never know the version. I manually degraded to pyzmq=19.0.2, it solves the issue.
My friend tried to use anaconda to help me to install the environment, it is ok to open the jupyter to run "hello world", but the tensorflow will fail, it's weird and it's another story.

Thank you!

All the package versions are listed below.
`
PS C:\Windows\system32> pip list
Package Version

---

absl-py 0.11.0
anyio 2.1.0
argon2-cffi 20.1.0
astor 0.8.1
astunparse 1.6.3
async-generator 1.10
attrs 20.3.0
backcall 0.2.0
bleach 3.3.0
cached-property 1.5.2
cachetools 4.2.1
certifi 2020.12.5
cffi 1.14.4
chardet 4.0.0
colorama 0.4.4
contextvars 2.4
cryptography 3.2.1
cycler 0.10.0
dataclasses 0.8
decorator 4.4.2
defusedxml 0.6.0
entrypoints 0.3
flatbuffers 1.12
future 0.18.2
gast 0.3.3
google-auth 1.25.0
google-auth-oauthlib 0.4.2
google-pasta 0.2.0
grpcio 1.32.0
h5py 2.10.0
idna 2.10
immutables 0.15
importlib-metadata 3.4.0
ipykernel 5.4.3
ipython 7.16.1
ipython-genutils 0.2.0
jedi 0.18.0
Jinja2 2.11.3
json5 0.9.5
jsonschema 3.2.0
jupyter-client 6.1.11
jupyter-core 4.7.1
jupyter-kite 1.2.0
jupyter-server 1.3.0
jupyterlab 2.2.9
jupyterlab-pygments 0.1.2
jupyterlab-server 1.2.0
Keras-Applications 1.0.8
Keras-Preprocessing 1.1.2
kiwisolver 1.3.1
Markdown 3.3.3
MarkupSafe 1.1.1
matplotlib 3.3.4
mistune 0.8.4
mysqlclient 2.0.3
nbclient 0.5.2
nbconvert 6.0.7
nbformat 5.1.2
nest-asyncio 1.5.1
nodejs 0.1.1
notebook 6.2.0
npm 0.1.1
numpy 1.19.5
oauthlib 3.1.0
opt-einsum 3.3.0
optional-django 0.1.0
packaging 20.9
pandas 1.1.5
pandocfilters 1.4.3
parso 0.8.1
pickleshare 0.7.5
Pillow 8.1.0
pip 18.1
pipdeptree 2.0.0
prometheus-client 0.9.0
prompt-toolkit 3.0.14
protobuf 3.14.0
pyasn1 0.4.8
pyasn1-modules 0.2.8
pycparser 2.20
Pygments 2.7.4
pyparsing 2.4.7
pyrsistent 0.17.3
python-dateutil 2.8.1
pytz 2021.1
pywin32 300
pywinpty 0.5.7
pyzmq 19.0.2
requests 2.25.1
requests-oauthlib 1.3.0
rsa 4.7
Send2Trash 1.5.0
setuptools 53.0.0
six 1.15.0
sniffio 1.2.0
tb-nightly 2.5.0a20210209
tensorboard 2.4.1
tensorboard-plugin-wit 1.8.0
tensorflow 2.4.1
tensorflow-estimator 2.4.0
tensorflow-gpu 2.4.1
termcolor 1.1.0
terminado 0.9.2
testpath 0.4.4
tf-estimator-nightly 2.5.0.dev2021020901
torch 1.7.0+cpu
torchaudio 0.7.0
torchvision 0.8.1+cpu
tornado 6.1
traitlets 4.3.3
typing-extensions 3.7.4.3
urllib3 1.24.3
wcwidth 0.2.5
webencodings 0.5.1
Werkzeug 1.0.1
wheel 0.36.2
wrapt 1.12.1
zipp 3.4.0
You are using pip version 18.1, however version 21.0.1 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.
`

[minrk]

Thanks for the info! I'll see if I can figure out how to debug it. Since it does not occur on my Windows VMs, I don't really feel like I have any actions available at the moment.

Were you able to run pyzmq tests with the commands I gave above? That might help narrow down the issue.

When I install jupyterlab or jupyter-notebook, it automatically install ipykernel and automatically install pyzmq=21.0.2, I have no choice

You do have a choice. You can always specify pinning of any package in the install command. For example:

pip install jupyterlab 'pyzmq<20'

ipykernel does not request 'pyzmq==22.0.2', it requests 'pyzmq' which gets the latest version by default. If you want to specify a different version, you can do that.

My friend tried to use anaconda to help me to install the environment

If you are using conda, it's a good idea to use conda to install packages like tensorflow and pyzmq that have DLL dependencies instead of mixing conda and pip. Tensorflow wheels in particular are known to have serious compatibility issues. For example:

conda create -n tensorflow tensorflow-gpu jupyterlab python=3.8

to create an environment called 'tensorflow' with tensorflow-gpu and jupyterlab with Python 3.8.

[zhanggyarcher]

@minrk the result is:

[minrk]

@zhanggyarcher could you download libzmq-v141-x64-4_3_4.zip from https://dl.bintray.com/zeromq/generic/ and run test_reqrep_tcp.exe and see if you get a similar error? If you do, could you also download the v140 version and test that?

[zhanggyarcher]

@minrk nothing has displayed, no error message

[zoloc]

Hello, recently I set up a new python environment on a new computer as usual, I got automatically installed pyzmq==21.0.2, and I cannot use jupyter notebook, Jupyter lab, vs code at all, the python kernel crashes every time when I open a editor, and after one second, it directly crashes and lose connection to the kernel.

This problem annoyed me for several weeks, and today I saw many people encountered this issue From December 2020 to January 2021. And I have never encountered this issue in the past.

Also, this error message is somewhat not useful and not making sense, finally I realized its pyzmq error.
I degraded it to pyzmq==19.0.2 , it finally resolved this issue.

I hope this could be fixed, or if you could push old versions of pyzmq for users to install as dependencies.
Thank you very much!

Thanks for the solution, I've fixed it