WIndows 7 DLL load failed

[PhilippSelenium]

>> import zmq
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\venv\lib\site-packages\zmq\__init__.p
    _load_libzmq()
  File "C:\Users\venv\lib\site-packages\zmq\__init__.p
    from . import libzmq
ImportError: DLL load failed: The specified module could not be found.

• python 3.6.8 (Python 3.6.8 (tags/v3.6.8:3c6b436a57, Dec 24 2018, 00:16:47) [MSC v.1916 64 bit (AMD64)] on win32)
• windows 7 enterprise
• pyzmq==21.0.0

Note: Works fine with pyzmq==20.0.0
Maybe some packaging error?

[minrk]

Thanks for testing! Indeed, this is the first release built from a new CI infrastructure. win32 or win_amd64?

[PhilippSelenium]

It is 64bit

[minrk]

Hm, ok. I've tested 32b and 64b on my Windows VM (server-2019) and they work okay. I'll see if I can find an older one. Maybe they've been linked with some too-recent dependency.

Can you test with a later Python to see if it's isolated to 3.6?

[PhilippSelenium]

I get the same error for:

Python 3.8.7 (tags/v3.8.7:6503f05, Dec 21 2020, 17:59:51) [MSC v.1928 64 bit (AMD64)] on win32

[m-melis]

Probably related to error "Windows fatal exception: code 0xc0000139" we are getting with version 21. Was fine with version 20.

https://gitlab.com/secml/secml/-/jobs/965036924

[minrk]

I set up a new VM with server-2012 and get the same errors due to missing DLLs (first: vcruntime140_1.dll, which is added in Python >=3.8).

I think I tracked it down to building on windows-2019 with vs2019 instead of windows-2016 with vs2017. GitHub Actions doesn't appear to have a build environment with vs2015, which is used for Python 3.6, so we'll see.

#1473 will build new wheels with vs2017 and we can test them out.

[minrk]

@PhilippSelenium can you test with the wheels in the wheels-win_amd64 artifact? It's a zipfile of win_amd64 wheels for py36-39. They work on my Windows server-2012 VM, so I think they are going to work for you. I'll go a head and cut 21.0.1 with the fix if you can confirm that those wheels work for you.

[minrk]

depending on timeline, I will cut 21.0.1 before I have to quit for the day if I don't hear anything (I'm not sure what your timezone is, it might already be the middle of the night for you!), since it at least fixes the issue for my environment where I was able to reproduce the issue. There's always 21.0.2 :)

[PhilippSelenium]

@minrk Thanks for the lightning fast fix. Sadly it does not fix my problem. But it might have to do with my environment. I'm investigating ...

[minrk]

make sure to remove the old pyzmq before installing the new one, since those wheels have the same version and a simple pip install ./pyzmq-21... will give "I already have that!" and not actually install the new one.

I used Dependency Walker on the installed libzmq....pyd to identify what's missing. If you can do the same and share a screenshot, that would help.

[PhilippSelenium]

I uninstalled the old zmq first and also checked that the folder is not in site-packages.

As requested I attached a screenshot

[minrk]

Does the python 3.8 wheel work for you?

[PhilippSelenium]

No it is the same error for both :(

[PhilippSelenium]

Using pyzmq==20.0.0 (which works for me) I get the following dependency erros:

I also tried reinstalling vc_redist.x64.exe but the problem might be the old windows version or just using windows.
I will try to update to win10 or pin the pyzmq dependency.