Trying to ./python -m test -R: test_index crashes with a failed assertion

[ambv]

Bug report

Bug description:

❯ ./configure --with-pydebug
❯ make
❯ ./python.exe -m test -R: test_index
Using random seed: 2250434908
0:00:00 load avg: 4.79 Run 1 test sequentially in a single process
0:00:00 load avg: 4.79 [1/1] test_index
beginning 9 repetitions. Showing number of leaks (. for 0 or less, X for 10 or more)
12345:6789
XAssertion failed: (!_PyErr_Occurred(tstate)), function _PyEval_EvalFrameDefault, file generated_cases.c.h, line 12425.
Fatal Python error: Aborted

Current thread 0x000000020f324c80 (most recent call first):
  File "/Volumes/RAMDisk/cpython/Lib/test/test_index.py", line 7 in __index__
  File "/Volumes/RAMDisk/cpython/Lib/test/test_index.py", line 216 in __getitem__
  File "/Volumes/RAMDisk/cpython/Lib/test/test_index.py", line 158 in <lambda>
  File "/Volumes/RAMDisk/cpython/Lib/unittest/case.py", line 247 in handle
  File "/Volumes/RAMDisk/cpython/Lib/unittest/case.py", line 813 in assertRaises
  File "/Volumes/RAMDisk/cpython/Lib/test/test_index.py", line 159 in test_error
  File "/Volumes/RAMDisk/cpython/Lib/unittest/case.py", line 615 in _callTestMethod
  File "/Volumes/RAMDisk/cpython/Lib/unittest/case.py", line 669 in run
  File "/Volumes/RAMDisk/cpython/Lib/unittest/case.py", line 725 in __call__
  File "/Volumes/RAMDisk/cpython/Lib/unittest/suite.py", line 122 in run
  File "/Volumes/RAMDisk/cpython/Lib/unittest/suite.py", line 84 in __call__
  File "/Volumes/RAMDisk/cpython/Lib/unittest/suite.py", line 122 in run
  File "/Volumes/RAMDisk/cpython/Lib/unittest/suite.py", line 84 in __call__
  File "/Volumes/RAMDisk/cpython/Lib/test/libregrtest/testresult.py", line 148 in run
  File "/Volumes/RAMDisk/cpython/Lib/test/libregrtest/single.py", line 84 in _run_suite
  File "/Volumes/RAMDisk/cpython/Lib/test/libregrtest/single.py", line 42 in run_unittest
  File "/Volumes/RAMDisk/cpython/Lib/test/libregrtest/single.py", line 162 in test_func
  File "/Volumes/RAMDisk/cpython/Lib/test/libregrtest/refleak.py", line 138 in runtest_refleak
  File "/Volumes/RAMDisk/cpython/Lib/test/libregrtest/single.py", line 114 in regrtest_runner
  File "/Volumes/RAMDisk/cpython/Lib/test/libregrtest/single.py", line 165 in _load_run_test
  File "/Volumes/RAMDisk/cpython/Lib/test/libregrtest/single.py", line 210 in _runtest_env_changed_exc
  File "/Volumes/RAMDisk/cpython/Lib/test/libregrtest/single.py", line 319 in _runtest
  File "/Volumes/RAMDisk/cpython/Lib/test/libregrtest/single.py", line 348 in run_single_test
  File "/Volumes/RAMDisk/cpython/Lib/test/libregrtest/main.py", line 389 in run_test
  File "/Volumes/RAMDisk/cpython/Lib/test/libregrtest/main.py", line 419 in run_tests_sequentially
  File "/Volumes/RAMDisk/cpython/Lib/test/libregrtest/main.py", line 561 in _run_tests
  File "/Volumes/RAMDisk/cpython/Lib/test/libregrtest/main.py", line 596 in run_tests
  File "/Volumes/RAMDisk/cpython/Lib/test/libregrtest/main.py", line 768 in main
  File "/Volumes/RAMDisk/cpython/Lib/test/libregrtest/main.py", line 776 in main
  File "/Volumes/RAMDisk/cpython/Lib/test/__main__.py", line 2 in <module>
  File "/Volumes/RAMDisk/cpython/Lib/runpy.py", line 88 in _run_code
  File "/Volumes/RAMDisk/cpython/Lib/runpy.py", line 198 in _run_module_as_main

Current thread's C stack trace (most recent call first):
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at _Py_DumpStack+0x44 [0x102e106a0]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at faulthandler_dump_c_stack+0x68 [0x102e2f06c]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at faulthandler_fatal_error+0x204 [0x102e2ee78]
  Binary file "/usr/lib/system/libsystem_platform.dylib", at _sigtramp+0x38 [0x1a048b624]
  Binary file "/usr/lib/system/libsystem_pthread.dylib", at pthread_kill+0x128 [0x1a045188c]
  Binary file "/usr/lib/system/libsystem_c.dylib", at abort+0x7c [0x1a035ac60]
  Binary file "/usr/lib/system/libsystem_c.dylib", at err+0x0 [0x1a0359eec]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at _PyEval_EvalFrameDefault+0x3cdc0 [0x102d20568]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at _PyEval_EvalFrame+0x3c [0x102ce3500]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at _PyEval_Vector+0x228 [0x102ce3448]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at _PyFunction_Vectorcall+0x13c [0x102af23f8]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at _PyObject_VectorcallTstate+0x13c [0x102bdd44c]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at vectorcall_unbound+0x70 [0x102bdd620]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at vectorcall_method+0xbc [0x102bdb5e8]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at slot_nb_index+0x44 [0x102bf3944]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at _PyNumber_Index+0xb8 [0x102ac49bc]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at PyNumber_AsSsize_t+0x1c [0x102ac07c0]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at _PyEval_SliceIndex+0x50 [0x102d285ec]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at PySlice_Unpack+0x124 [0x102bc6c80]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at list_slice_subscript+0xb0 [0x102b41ddc]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at list_subscript+0xc4 [0x102b49070]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at PyObject_GetItem+0x78 [0x102ac0524]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at _PyEval_EvalFrameDefault+0x4f4 [0x102ce3c9c]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at _PyEval_EvalFrame+0x3c [0x102ce3500]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at _PyEval_Vector+0x228 [0x102ce3448]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at _PyFunction_Vectorcall+0x13c [0x102af23f8]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at _PyObject_VectorcallTstate+0x13c [0x102bdd44c]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at vectorcall_unbound+0x70 [0x102bdd620]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at vectorcall_method+0xbc [0x102bdb5e8]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at slot_mp_subscript+0x50 [0x102bf3fe0]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at PyObject_GetItem+0x78 [0x102ac0524]
  Binary file "/Volumes/RAMDisk/cpython/python.exe", at _PyEval_EvalFrameDefault+0x4d80 [0x102ce8528]
  <truncated rest of calls>

Extension modules: _testinternalcapi (total: 1)

Platforms reproduced:

• Windows 11 AMD64
• macOS Sequoia 15.4.1 M1 Max
• Ubuntu 22.04 M1 Max

The crash is present on ad2f088 (latest main at time of writing). Currently bisecting.

CPython versions tested on:

CPython main branch

Operating systems tested on:

macOS

Linked PRs

• gh-133258: fix crash in test_index #133262

[ambv]

Bisected to 5529213, i.e. #132626.

[itamaro]

looks like this is fixed & done, closing