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JIT corruption in wcmatch test suite: yield from [] triggers "AttributeError: 'list' object has no attribute 'send'" #155823
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interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)topic-JITtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
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Bug description:
When running wcmatch 15.0.1 complete test suite (doesn't happen with parts of it, or the older version), I'm seeing the following corruption:
$ uv venv -p ~/cpython/python
Using CPython 3.16.0a0 interpreter at: /home/mgorny/cpython/python
Creating virtual environment at: .venv
Activate with: source .venv/bin/activate
$ uv pip install -e . pytest
Resolved 7 packages in 659ms
Built wcmatch @ file:///home/mgorny/wcmatch
Prepared 1 package in 210ms
Installed 7 packages in 58ms
+ bracex==3.0.1
+ iniconfig==2.3.0
+ packaging==26.3
+ pluggy==1.6.0
+ pygments==2.20.0
+ pytest==9.1.1
+ wcmatch==11.0.1 (from file:///home/mgorny/wcmatch)
$ .venv/bin/pytest
========================================================= test session starts =========================================================
platform linux -- Python 3.16.0a0, pytest-9.1.1, pluggy-1.6.0
rootdir: /home/mgorny/wcmatch
configfile: pyproject.toml
collected 1409 items
tests/test_fnmatch.py ......................................................................................................... [ 7%]
................................................................s............................... [ 14%]
tests/test_glob.py ....s..s.................s.s..s.s..s.........sssssss.......s.ssss........s.s..............s.........s.s..... [ 21%]
........s..s.................s.s..s.s..s.........sssssss.......s.ssss........s.s..............s.........s.s......s............. [ 30%]
.s..s......s.s.........ssssss....s..s.................s.s..s.s..s.........sssssss.......s.ssss........s.s..............s....... [ 39%]
..s.s........sss..s............... [ 42%]
tests/test_globmatch.py ss...............s.s.s..........s...............................................s............s...s..... [ 49%]
s.s....s....s...s.s......s..s......s......s..........................s.......s.......................................s...s..... [ 58%]
...................s..s.s........s..s....s.s.....s.....ss...............s.s.s..........s....................................... [ 67%]
........s............s...s.....s.s....s....s...s.s......s..s......s......s..........................s.......s.................. [ 76%]
.....................s...s........................s..s.s........s..s....s.s.....s.............................................. [ 85%]
...............................F..........s....................................................... [ 92%]
tests/test_pathlib.py ......................................................... [ 96%]
tests/test_versions.py .... [ 97%]
tests/test_wcmatch.py .......................... [ 98%]
tests/test_wcparse.py ................ [100%]
============================================================== FAILURES ===============================================================
____________________________________________ TestGlobMatchSpecial.test_empty_pattern_lists ____________________________________________
self = <tests.test_globmatch.TestGlobMatchSpecial testMethod=test_empty_pattern_lists>
def test_empty_pattern_lists(self):
"""Test empty pattern lists."""
> self.assertFalse(glob.globmatch('test', []))
^^^^^^^^^^^^^^^^^^^^^^^^^^
tests/test_globmatch.py:1021:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
wcmatch/glob.py:1005: in globmatch
return _wcparse.compile(
wcmatch/_wcparse.py:759: in compile
positive, negative = compile_pattern(patterns, flags, limit, exclude)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
wcmatch/_wcparse.py:718: in compile_pattern
for pattern in iter_patterns(patterns):
^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
patterns = []
def iter_patterns(patterns: AnyStr | Sequence[AnyStr]) -> Iterable[AnyStr]:
"""Return a simple string sequence."""
if isinstance(patterns, (str, bytes)):
yield patterns
else:
> yield from patterns
E AttributeError: 'list' object has no attribute 'send'
wcmatch/_wcparse.py:338: AttributeError
======================================================= short test summary info =======================================================
FAILED tests/test_globmatch.py::TestGlobMatchSpecial::test_empty_pattern_lists - AttributeError: 'list' object has no attribute 'send'
============================================ 1 failed, 1257 passed, 151 skipped in 12.57s =============================================CPython versions tested on:
3.15, CPython main branch
Operating systems tested on:
Linux
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interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)topic-JITtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
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mgorny commentedon Aug 15, 2026
Oh, sorry: reproduced with 3.15 as of 042df0a, and main as of 9ee248c.
aisk commentedon Aug 15, 2026
Can you run the tests with
PYTHON_JIT=0to ensure this is caused by JIT?mgorny commentedon Aug 15, 2026
Sorry if that wasn't clear: I've done that, and with JIT disabled, the tests pass.
gh-155823: Fix stale stack on _SEND_VIRTUAL_TIER_TWO exhausted exit (G…
[3.15] gh-155823: Fix stale stack on _SEND_VIRTUAL_TIER_TWO exhausted…