3.15.0b2, openSUSE/Factory, i586: failing test: test_c_stack_unwind (specifically test_manual_unwind_finds_expected_frames)

Bug report

Bug description:

As a followup to https://github.com/python/cpython/issues/151040 I am creating this separate ticket for i586. The traceback is exactly the same:

[ 3208s]   test_manual_unwind_finds_expected_frames (test.test_c_stack_unwind.ManualStackUnwindTests.test_manual_unwind_finds_expected_frames) (env={'PYTHON_JIT': '0'}) ... FAIL
[ 3208s] 
[ 3208s] ======================================================================
[ 3208s] FAIL: test_manual_unwind_finds_expected_frames (test.test_c_stack_unwind.ManualStackUnwindTests.test_manual_unwind_finds_expected_frames) (env={'PYTHON_JIT': '0'})
[ 3208s] ----------------------------------------------------------------------
[ 3208s] Traceback (most recent call last):
[ 3208s]   File "/home/abuild/rpmbuild/BUILD/python315-3.15.0_b2-build/Python-3.15.0b2/Lib/test/test_c_stack_unwind.py", line 285, in test_manual_unwind_finds_expected_frames
[ 3208s]     self.assertGreaterEqual(
[ 3208s]     ~~~~~~~~~~~~~~~~~~~~~~~^
[ 3208s]         python_frames,
[ 3208s]         ^^^^^^^^^^^^^^
[ 3208s]         STACK_DEPTH,
[ 3208s]         ^^^^^^^^^^^^
[ 3208s]         f"expected to find Python frames on {self.machine} with env {env}",
[ 3208s]         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[ 3208s]     )
[ 3208s]     ^
[ 3208s] AssertionError: 1 not greater than or equal to 10 : expected to find Python frames on i686 with env {'PYTHON_JIT': '0'}
[ 3208s] 
[ 3208s] ----------------------------------------------------------------------
[ 3208s] Ran 1 test in 0.276s
[ 3208s] 
[ 3208s] FAILED (failures=1)

Build log shows all used packages and steps required to be taken. The repository with the package source is https://src.opensuse.org/python-interpreters/python315

@vstinner on the other ticket commented:

That's a different architecture. If you care, you should open a separated issue for i586. You pass explicitly -fomit-frame-pointer which goes against PEP 831 (approved in Python 3.15).

Yes, we have -fomit-frame-pointer specifically for i586 architecture.

CPython versions tested on:

3.15

Operating systems tested on:

Linux

Start with Lib/test/test_c_stack_unwind.py, especially ManualStackUnwindTests.test_manual_unwind_finds_expected_frames around line 285, and reproduce the failure on i586 using the openSUSE python315 package build. Inspect the build log and the explicit -fomit-frame-pointer setting in relation to PEP 831. Done means the failing test reliably passes on i586 or the platform limitation is documented with an appropriate test outcome.