Python regression related to unix sockets

Sun Nov 6 22:50:29 GMT 2022

Hi Fabian,
Fabian Henze wrote:
> Hi all,
>> This is a follow-up on a mail thread from February 2021.
>> Mark Geisert via Cygwin wrote:
>> Fabian Henze via Cygwin wrote:
>>> Hi Cygwin users,
>>> I noticed a regression in the recent Python packages: Between version
>>> 3.6.10-1 and 3.6.12-2, accessing the SSH agent via the paramiko python
>>> package broke. When a ssh agent is used, paramiko tries to connect to
>>> it via the unix socket and just freezes. Python 3.8 is also affected,
>>> but I don't know which was the last working one.
>>> I was able to pinpoint that error to 3.6.12-socketmodule.patch [1].
>>> Reverting/removing the patch fixes the ssh agent access.
>>> A few weeks ago there was a discussion regarding "Problems with native
>>> Unix domain sockets on Win 10/2019", but it seems unrelated as the
>>> cygwin1.dll from [2] does not work for me.
>>>>>> Can you please check if you are able to reproduce that? I uploaded a
>>> script [3] for that.
>>>>>> Best regards,
>>> Fabian Henze
>>>> Thanks for the report and sorry you've run into this. The patch is a workaround that's evidently too draconian. I will debug the situation using your testcase.
>> Thank you very much for the testcase.
>> Did you (or anyone else) make any progress on this that you can share?
> Unfortunately the issue still persists in all current python versions.
> If no one has time to debug and fix this, would it be an option to remove the
> 3.6.12-socketmodule.patch that is causing the regression since it only fixes a
> theoretical problem in unit tests, but causes real-world issues? Maybe the
> upcoming (?) Python 3.10 or 3.11 bump would be a good candidate to do so?

Sorry for delay in responding; I've just returned from vacation.
Let me find my notes for this issue and see if I can improve on the patch or find 
some other solution for now-current versions of Python and/or Cygwin DLL.
..mark