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[Free Threading] test_builtin.ImmortalTests fail on i686 (32-bit) #128058
Description
Bug report
Bug description:
In Fedora Linux, when building 3.14.0a3 on i686 architecture and freethreading-debug build, test_tuple_respect_immortality, test_list_repeat_respect_immortality and test_immortals fail.
This is not happening on x86_64, aarch64. We don't know about the other arches yet.
FAIL: test_tuple_repeat_respect_immortality (test.test_builtin.ImmortalTests.test_tuple_repeat_respect_immortality) [256]
----------------------------------------------------------------------
Traceback (most recent call last):
File "/builddir/build/BUILD/python3.14-3.14.0_a3-build/Python-3.14.0a3/Lib/test/test_builtin.py", line 2702, in assert_immortal
self.assertEqual(sys.getrefcount(immortal), self.IMMORTAL_REFCOUNT)
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: 1342177280 != 1879048192
FAIL: test_immortals (test.test_builtin.ImmortalTests.test_immortals) [None]
----------------------------------------------------------------------
Traceback (most recent call last):
File "/builddir/build/BUILD/Python-3.14.0a3/Lib/test/test_builtin.py", line 2702, in assert_immortal
self.assertEqual(sys.getrefcount(immortal), self.IMMORTAL_REFCOUNT)
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: 1342177280 != 1879048192CPython versions tested on:
3.14
Operating systems tested on:
Linux
Activity
vstinner commentedon Dec 18, 2024
cc @ericsnowcurrently
[-]AssertionError in `test_tuple_repeat_respect_immortality`, `test_immortals` during the freethreading-debug build on i686[/-][+]AssertionError in `test_{tuple,list}_repeat_respect_immortality`, `test_immortals` during the freethreading-debug build on i686[/+]ZeroIntensity commentedon Dec 18, 2024
I think this is probably because there's a different reference count for heap immortals and static immortals now (#127797). Does this occur on non-free-threaded builds?
cc @markshannon
pythongh-128058: Fix test_builtin ImmortalTests
vstinner commentedon Dec 18, 2024
Ah, it's a simple typo in ImmortalTests.IMMORTAL_REFCOUNT: on 32-bit systems, _Py_IMMORTAL_INITIAL_REFCNT is defined as 5 << 28, not as 7 << 28.Free Threading uses a different value for immortal objects.
vstinner commentedon Dec 18, 2024
I created PR gh-128068 to fix this regression.
[-]AssertionError in `test_{tuple,list}_repeat_respect_immortality`, `test_immortals` during the freethreading-debug build on i686[/-][+][Free Threading] test_builtin.ImmortalTests fail on i686 (32-bit)[/+]gh-128058: Fix test_builtin ImmortalTests (#128068)
vstinner commentedon Dec 20, 2024
Fixed by change daa260e. Thanks for the report @befeleme.
pythongh-128058: Fix test_builtin ImmortalTests (python#128068)
pythongh-128058: Fix test_builtin ImmortalTests (python#128068)