Bug 2323164 - python-iniparse fails to build with Python 3.14: _pickle.PicklingError: Can't pickle local object <function TestIni.test_queue.<locals>.getxy at 0x7f86659a7740>
Summary: python-iniparse fails to build with Python 3.14: _pickle.PicklingError: Can't...
Keywords:
Status: NEW
Alias: None
Product: Fedora
Classification: Fedora
Component: python-iniparse
Version: 42
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Ali Erdinc Koroglu
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks: PYTHON3.14
TreeView+ depends on / blocked
 
Reported: 2024-11-01 14:47 UTC by Karolina Surma
Modified: 2025-02-26 13:14 UTC (History)
6 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Type: Bug
Embargoed:


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System ID Private Priority Status Summary Last Updated
Github python cpython issues 126831 0 None open 3.14.0a1: `_pickle.PicklingError: Can't pickle local object` when a multiprocessing.Process is started with target funct... 2024-11-14 12:48:23 UTC

Description Karolina Surma 2024-11-01 14:47:03 UTC
python-iniparse fails to build with Python 3.14.0a1.

ERROR: test_queue (tests.test_multiprocessing.TestIni.test_queue)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/python-iniparse-0.5-build/python-iniparse-0.5/tests/test_multiprocessing.py", line 27, in test_queue
    p.start()
    ~~~~~~~^^
  File "/usr/lib64/python3.14/multiprocessing/process.py", line 121, in start
    self._popen = self._Popen(self)
                  ~~~~~~~~~~~^^^^^^
  File "/usr/lib64/python3.14/multiprocessing/context.py", line 224, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
  File "/usr/lib64/python3.14/multiprocessing/context.py", line 300, in _Popen
    return Popen(process_obj)
  File "/usr/lib64/python3.14/multiprocessing/popen_forkserver.py", line 35, in __init__
    super().__init__(process_obj)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
  File "/usr/lib64/python3.14/multiprocessing/popen_fork.py", line 20, in __init__
    self._launch(process_obj)
    ~~~~~~~~~~~~^^^^^^^^^^^^^
  File "/usr/lib64/python3.14/multiprocessing/popen_forkserver.py", line 47, in _launch
    reduction.dump(process_obj, buf)
    ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.14/multiprocessing/reduction.py", line 60, in dump
    ForkingPickler(file, protocol).dump(obj)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^
_pickle.PicklingError: Can't pickle local object <function TestIni.test_queue.<locals>.getxy at 0x7f86659a7740>
when serializing dict item '_target'
when serializing multiprocessing.context.Process state
when serializing multiprocessing.context.Process object

----------------------------------------------------------------------
Ran 96 tests in 0.046s

FAILED (errors=1, skipped=1)

https://docs.python.org/3.14/whatsnew/3.14.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.14/fedora-rawhide-x86_64/08189203-python-iniparse/

For all our attempts to build python-iniparse with Python 3.14, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.14/package/python-iniparse/

Testing and mass rebuild of packages is happening in copr.
You can follow these instructions to test locally in mock if your package builds with Python 3.14:
https://copr.fedorainfracloud.org/coprs/g/python/python3.14/

Let us know here if you have any questions.

Python 3.14 is planned to be included in Fedora 43.
To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.14.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires),
so if this package is required a lot, it's important for us to get it fixed soon.

We'd appreciate help from the people who know this package best,
but if you don't want to work on this now, let us know so we can try to work around it on our side.

Comment 1 Karolina Surma 2024-11-18 09:19:17 UTC
Per https://docs.python.org/dev/whatsnew/3.14.html#multiprocessing:

The default start method (see Contexts and start methods) changed from fork to forkserver on platforms other than macOS & Windows where it was already spawn. If you require the threading incompatible fork start method you must explicitly request it using a context from multiprocessing.get_context() (preferred) or change the default via multiprocessing.set_start_method(). (Contributed by Gregory P. Smith in gh-84559.)

Comment 2 Aoife Moloney 2025-02-26 13:14:19 UTC
This bug appears to have been reported against 'rawhide' during the Fedora Linux 42 development cycle.
Changing version to 42.


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