Bug 2458689

Summary: python-bytecode fails to build with Python 3.15: 9 tests fail
Product: [Fedora] Fedora Reporter: Karolina Surma <ksurma>
Component: python-bytecodeAssignee: Benson Muite <benson_muite>
Status: NEW --- QA Contact:
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: rawhideCC: benson_muite, ksurma, mhroncok
Target Milestone: ---   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2412434    

Description Karolina Surma 2026-04-15 14:20:07 UTC
python-bytecode fails to build with Python 3.15.0a8.

9 test failures with various tracebacks happen with the new Python:

FAILED tests/test_cfg.py::BytecodeBlocksTests::test_from_bytecode_loop - Valu...
FAILED tests/test_cfg.py::CFGStacksizeComputationTests::test_stack_size_computation_for_loop_continue
FAILED tests/test_cfg.py::CFGRoundTripTests::test_roundtrip_exception_handling
FAILED tests/test_code.py::CodeTests::test_loop - RuntimeError: Failed to com...
FAILED tests/test_concrete.py::ConcreteBytecodeTests::test_attr - AssertionEr...
FAILED tests/test_concrete.py::ConcreteFromCodeTests::test_extended_arg_make_function
FAILED tests/test_concrete.py::ConcreteFromCodeTests::test_fail_extended_arg_jump
FAILED tests/test_instr.py::InstrTests::test_stack_effects - AssertionError: ...
FAILED tests/test_misc.py::DumpCodeTests::test_concrete_bytecode - AssertionE...

https://docs.python.org/3.15/whatsnew/3.15.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.15/fedora-rawhide-x86_64/10318651-python-bytecode/

For all our attempts to build python-bytecode with Python 3.15, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.15/package/python-bytecode/

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 3.15:
https://copr.fedorainfracloud.org/coprs/g/python/python3.15/

Let us know here if you have any questions.

Python 3.15 is planned to be included in Fedora 45.
To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.15.
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.