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test_strftime_y2k fails while cross-compiling 3.14a3 for x86_64_v2 and x86_64_v3 on Linux #128104

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#128106
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test_strftime_y2k fails while cross-compiling 3.14a3 for x86_64_v2 and x86_64_v3 on Linux#128104
#128106
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3.14bugs and security fixesbugs and security fixesextension-modulesC modules in the Modules dirC modules in the Modules dirtestsTests in the Lib/test dirTests in the Lib/test dirtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
@zanieb

Description

@zanieb
zanieb
opened on Dec 19, 2024
Issue body actions

Bug report

Bug description:

The PGO test suite fails on the test_datetime tests; in particular, the test_strftime_y2k test cases. It looks like the padding is wrong:

cpython-3.14> AssertionError: '1-01-01' != '0001-01-01'

I believe this is related to:

Note this is occuring in the python-build-standalone builds. I have not reproduced it independently. This isn't a problem during our x86_64_v4 builds because we're not running PGO on them. The normal x86_64 build is working.

Toggle for the full test output 
cpython-3.14> test_system_transitions (test.datetimetester.ZoneInfoTest_Fast.test_system_transitions) ... ok
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDate_Fast.test_strftime_y2k) (year=1, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '1-01-01' != '0001-01-01'
cpython-3.14> - 1-01-01
cpython-3.14> + 0001-01-01
cpython-3.14> ? +++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDate_Fast.test_strftime_y2k) (year=1, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDate_Fast.test_strftime_y2k) (year=48, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '48-01-01' != '0048-01-01'
cpython-3.14> - 48-01-01
cpython-3.14> + 0048-01-01
cpython-3.14> ? ++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDate_Fast.test_strftime_y2k) (year=48, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDate_Fast.test_strftime_y2k) (year=70, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '70-01-01' != '0070-01-01'
cpython-3.14> - 70-01-01
cpython-3.14> + 0070-01-01
cpython-3.14> ? ++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDate_Fast.test_strftime_y2k) (year=70, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDate_Fast.test_strftime_y2k) (year=99, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '99-01-01' != '0099-01-01'
cpython-3.14> - 99-01-01
cpython-3.14> + 0099-01-01
cpython-3.14> ? ++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDate_Fast.test_strftime_y2k) (year=99, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDate_Fast.test_strftime_y2k) (year=99, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '99-01-01' != '0099-01-01'
cpython-3.14> - 99-01-01
cpython-3.14> + 0099-01-01
cpython-3.14> ? ++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDate_Fast.test_strftime_y2k) (year=99, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDate_Fast.test_strftime_y2k) (year=999, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '999-01-01' != '0999-01-01'
cpython-3.14> - 999-01-01
cpython-3.14> + 0999-01-01
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDate_Fast.test_strftime_y2k) (year=999, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '9' != '09'
cpython-3.14> - 9
cpython-3.14> + 09
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTime_Fast.test_strftime_y2k) (year=1, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '1-01-01' != '0001-01-01'
cpython-3.14> - 1-01-01
cpython-3.14> + 0001-01-01
cpython-3.14> ? +++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTime_Fast.test_strftime_y2k) (year=1, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTime_Fast.test_strftime_y2k) (year=48, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '48-01-01' != '0048-01-01'
cpython-3.14> - 48-01-01
cpython-3.14> + 0048-01-01
cpython-3.14> ? ++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTime_Fast.test_strftime_y2k) (year=48, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTime_Fast.test_strftime_y2k) (year=70, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '70-01-01' != '0070-01-01'
cpython-3.14> - 70-01-01
cpython-3.14> + 0070-01-01
cpython-3.14> ? ++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTime_Fast.test_strftime_y2k) (year=70, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTime_Fast.test_strftime_y2k) (year=99, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '99-01-01' != '0099-01-01'
cpython-3.14> - 99-01-01
cpython-3.14> + 0099-01-01
cpython-3.14> ? ++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTime_Fast.test_strftime_y2k) (year=99, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTime_Fast.test_strftime_y2k) (year=99, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '99-01-01' != '0099-01-01'
cpython-3.14> - 99-01-01
cpython-3.14> + 0099-01-01
cpython-3.14> ? ++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTime_Fast.test_strftime_y2k) (year=99, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTime_Fast.test_strftime_y2k) (year=999, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '999-01-01' != '0999-01-01'
cpython-3.14> - 999-01-01
cpython-3.14> + 0999-01-01
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTime_Fast.test_strftime_y2k) (year=999, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '9' != '09'
cpython-3.14> - 9
cpython-3.14> + 09
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTimeTZ_Fast.test_strftime_y2k) (year=1, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '1-01-01' != '0001-01-01'
cpython-3.14> - 1-01-01
cpython-3.14> + 0001-01-01
cpython-3.14> ? +++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTimeTZ_Fast.test_strftime_y2k) (year=1, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTimeTZ_Fast.test_strftime_y2k) (year=48, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '48-01-01' != '0048-01-01'
cpython-3.14> - 48-01-01
cpython-3.14> + 0048-01-01
cpython-3.14> ? ++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTimeTZ_Fast.test_strftime_y2k) (year=48, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTimeTZ_Fast.test_strftime_y2k) (year=70, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '70-01-01' != '0070-01-01'
cpython-3.14> - 70-01-01
cpython-3.14> + 0070-01-01
cpython-3.14> ? ++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTimeTZ_Fast.test_strftime_y2k) (year=70, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTimeTZ_Fast.test_strftime_y2k) (year=99, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '99-01-01' != '0099-01-01'
cpython-3.14> - 99-01-01
cpython-3.14> + 0099-01-01
cpython-3.14> ? ++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTimeTZ_Fast.test_strftime_y2k) (year=99, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTimeTZ_Fast.test_strftime_y2k) (year=99, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '99-01-01' != '0099-01-01'
cpython-3.14> - 99-01-01
cpython-3.14> + 0099-01-01
cpython-3.14> ? ++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTimeTZ_Fast.test_strftime_y2k) (year=99, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTimeTZ_Fast.test_strftime_y2k) (year=999, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '999-01-01' != '0999-01-01'
cpython-3.14> - 999-01-01
cpython-3.14> + 0999-01-01
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestDateTimeTZ_Fast.test_strftime_y2k) (year=999, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '9' != '09'
cpython-3.14> - 9
cpython-3.14> + 09
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestSubclassDateTime_Fast.test_strftime_y2k) (year=1, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '1-01-01' != '0001-01-01'
cpython-3.14> - 1-01-01
cpython-3.14> + 0001-01-01
cpython-3.14> ? +++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestSubclassDateTime_Fast.test_strftime_y2k) (year=1, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestSubclassDateTime_Fast.test_strftime_y2k) (year=48, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '48-01-01' != '0048-01-01'
cpython-3.14> - 48-01-01
cpython-3.14> + 0048-01-01
cpython-3.14> ? ++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestSubclassDateTime_Fast.test_strftime_y2k) (year=48, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestSubclassDateTime_Fast.test_strftime_y2k) (year=70, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '70-01-01' != '0070-01-01'
cpython-3.14> - 70-01-01
cpython-3.14> + 0070-01-01
cpython-3.14> ? ++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestSubclassDateTime_Fast.test_strftime_y2k) (year=70, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestSubclassDateTime_Fast.test_strftime_y2k) (year=99, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '99-01-01' != '0099-01-01'
cpython-3.14> - 99-01-01
cpython-3.14> + 0099-01-01
cpython-3.14> ? ++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestSubclassDateTime_Fast.test_strftime_y2k) (year=99, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestSubclassDateTime_Fast.test_strftime_y2k) (year=99, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '99-01-01' != '0099-01-01'
cpython-3.14> - 99-01-01
cpython-3.14> + 0099-01-01
cpython-3.14> ? ++
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestSubclassDateTime_Fast.test_strftime_y2k) (year=99, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '0' != '00'
cpython-3.14> - 0
cpython-3.14> + 00
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestSubclassDateTi
cpython-3.14> me_Fast.test_strftime_y2k) (year=999, specifier='F')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '999-01-01' != '0999-01-01'
cpython-3.14> - 999-01-01
cpython-3.14> + 0999-01-01
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ======================================================================
cpython-3.14> FAIL: test_strftime_y2k (test.datetimetester.TestSubclassDateTime_Fast.test_strftime_y2k) (year=999, specifier='C')
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Traceback (most recent call last):
cpython-3.14>   File "/build/Python-3.14.0a3/Lib/test/datetimetester.py", line 1814, in test_strftime_y2k
cpython-3.14>     self.assertEqual(d.strftime(f"%{specifier}"), expected)
cpython-3.14>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cpython-3.14> AssertionError: '9' != '09'
cpython-3.14> - 9
cpython-3.14> + 09
cpython-3.14> ? +
cpython-3.14> 
cpython-3.14> 
cpython-3.14> ----------------------------------------------------------------------
cpython-3.14> Ran 1058 tests in 3.495s
cpython-3.14> 
cpython-3.14> FAILED (failures=48, skipped=52)
cpython-3.14> test test_datetime failed

You can see the run in CI here, though it does not include the test output because you have to hack the test suite to show verbose output with --pgo.

I believe this is basically a duplicate of #123681, but I figured I'd open a issue for discoverability.

CPython versions tested on:

3.14

Operating systems tested on:

Linux

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    3.14bugs and security fixesbugs and security fixesextension-modulesC modules in the Modules dirC modules in the Modules dirtestsTests in the Lib/test dirTests in the Lib/test dirtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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