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SystemError when passing invalid argument to posix_spawn #143698
Description
Bug report
Bug description:
Seems os.posix_spawn uses new-style argument parsing with kwtuple in a vectorcall function, which can trigger a SystemError instead of a TypeError for invalid keyword-only argument.
Tested on Ubuntu 22.04:
>>> import os
>>> os.posix_spawn("/bin/echo", ["echo", "hi"], os.environ, scheduler=None)
Traceback (most recent call last):
File "<python-input-1>", line 1, in <module>
os.posix_spawn("/bin/echo", ["echo", "hi"], os.environ, scheduler=None)
~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
SystemError: new style getargs format but argument is not a tupleCPython versions tested on:
CPython main branch, 3.9
Operating systems tested on:
Linux
Linked PRs
- gh-143698: correctly check
schedulerandsetpgroupvalues foros.posix_spawn[p]#143699 - [3.14] gh-143698: correctly check
schedulerandsetpgroupvalues foros.posix_spawn[p](GH-143699) #145073 - [3.13] gh-143698: correctly check
schedulerandsetpgroupvalues foros.posix_spawn[p](GH-143699) #145074
Activity
pythongh-143698: correctly check `scheduler` type for `os.posix_spawn…
pythongh-143698: correctly check `scheduler` type for `os.posix_spawn…
picnixz commentedon Jan 11, 2026
Thanks for the report and sorry if you have actually planned to write a PR!
fury0928 commentedon Jan 13, 2026
HI @picnixz nice to meet you
I'd like to contribute on this issue
May I take up this if still open?
Thank you
picnixz commentedon Jan 13, 2026
Not really, I am already working on it.
fury0928 commentedon Jan 13, 2026
Do you have any issue that might be good fit for contribution?
If so, please assign me
gh-143698: correctly check `scheduler` and `setpgroup` values for `os…
[3.14] pythongh-143698: correctly check `scheduler` and `setpgroup` v…
[3.13] pythongh-143698: correctly check `scheduler` and `setpgroup` v…
[3.14] gh-143698: correctly check `scheduler` and `setpgroup` values …
[3.13] gh-143698: correctly check `scheduler` and `setpgroup` values …
pythongh-143698: correctly check `scheduler` and `setpgroup` values f…
pythongh-143698: correctly check `scheduler` and `setpgroup` values f…