Bug 2366454 - root fails to build with Python 3.14: AssertionErrors in test_refcount
Summary: root fails to build with Python 3.14: AssertionErrors in test_refcount
Keywords:
Status: CLOSED RAWHIDE
Alias: None
Product: Fedora
Classification: Fedora
Component: root
Version: rawhide
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Mattias Ellert
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks: PYTHON3.14
TreeView+ depends on / blocked
 
Reported: 2025-05-15 09:41 UTC by Karolina Surma
Modified: 2025-06-09 21:11 UTC (History)
4 users (show)

Fixed In Version: root-6.36.00-1.fc43
Clone Of:
Environment:
Last Closed: 2025-06-09 21:11:41 UTC
Type: Bug
Embargoed:


Attachments (Terms of Use)

Description Karolina Surma 2025-05-15 09:41:38 UTC
root fails to build with Python 3.14.0b1.

FAIL: test_refcount (rvec_asrvec.AsRVec.test_refcount)
Test reference count of returned RVec
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/root-6.34.08-build/root-6.34.08/bindings/pyroot/pythonizations/test/rvec_asrvec.py", line 110, in test_refcount
    self.assertEqual(sys.getrefcount(rvec), 2)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: 1 != 2


FAIL: test_refcount (rdataframe_makenumpy.DataFrameFromNumpy.test_refcount)
Check refcounts of associated PyObjects
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/root-6.34.08-build/root-6.34.08/bindings/pyroot/pythonizations/test/rdataframe_makenumpy.py", line 49, in test_refcount
    self.assertEqual(sys.getrefcount(data), 2)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: 1 != 2

This will probably be related to https://docs.python.org/dev/whatsnew/3.14.html#whatsnew314-refcount

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.14-b1/fedora-rawhide-x86_64/09037400-root/

For all our attempts to build root with Python 3.14, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.14-b1/package/root/

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-b1/

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 Mattias Ellert 2025-06-09 21:11:41 UTC
 Fixed in root-6.36.00-1.fc43 (built for koji target f43-python).


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