Python 3.11: Assertion `_PyOpcode_Deopt[first_instr[frame->f_code->_co_firsttraceable]] == RESUME' failed

[vstinner]

Oh, Python 3.11 was aborted by an assertion failure on "s390x Fedora Clang 3.11" buildbot at commit 3b4f5ed:

build: https://buildbot.python.org/all/#builders/953/builds/161

python: Python/ceval.c:5617: PyObject *_PyEval_EvalFrameDefault(PyThreadState *, _PyInterpreterFrame *, int): Assertion `_PyOpcode_Deopt[first_instr[frame->f_code->_co_firsttraceable]] == RESUME' failed.
Fatal Python error: Aborted

Current thread 0x000003ff8b376710 (most recent call first):
  File "/home/dje/cpython-buildarea/3.11.edelsohn-fedora-z.clang/build/Lib/bdb.py", line 595 in run
  File "/home/dje/cpython-buildarea/3.11.edelsohn-fedora-z.clang/build/Lib/doctest.py", line 2653 in debug_script
  File "/home/dje/cpython-buildarea/3.11.edelsohn-fedora-z.clang/build/Lib/doctest.py", line 2633 in debug_src
  File "<doctest test.test_doctest.test_debug[3]>", line 1 in <module>
  File "/home/dje/cpython-buildarea/3.11.edelsohn-fedora-z.clang/build/Lib/doctest.py", line 1350 in __run
  File "/home/dje/cpython-buildarea/3.11.edelsohn-fedora-z.clang/build/Lib/doctest.py", line 1497 in run
  File "/home/dje/cpython-buildarea/3.11.edelsohn-fedora-z.clang/build/Lib/doctest.py", line 2215 in runTest
  (...)
  File "/home/dje/cpython-buildarea/3.11.edelsohn-fedora-z.clang/build/Lib/runpy.py", line 198 in _run_module_as_main

Extension modules: _testcapi, _testinternalcapi (total: 2)

[vstinner]

Oh, many tests failed!

17 tests failed:
    test_audit test_bdb test_cprofile test_doctest test_import
    test_patma test_pdb test_profile test_pstats test_regrtest
    test_scope test_sys_setprofile test_sys_settrace test_threading
    test_trace test_unittest test_zipimport_support

@pablogsal: I suggest to hold the next release until this issue is investigated!

[vstinner]

Same on a similar buildbot worker: "s390x Fedora Rawhide Refleaks 3.11"
https://buildbot.python.org/all/#/builders/1000/builds/53

17 tests failed:
    test_audit test_bdb test_cprofile test_doctest test_import
    test_patma test_pdb test_profile test_pstats test_regrtest
    test_scope test_sys_setprofile test_sys_settrace test_threading
    test_trace test_unittest test_zipimport_support

[tiran]

Fixed by #94411

[tiran]

The assert breaks on big endian machiens because it is missing a _Py_OPCODE(). My PR #94411 removes the assert. It is not present in main.

[markshannon]

Thanks @tiran for fixing this