Crash report

What happened?

The make testios testing target crashes when compiled --with-pydebug enabled (as is done in CI).

The error is a SIGABRT, raised during test_types; however, running test_types by itself isn't enough to reproduce the problem.

The error is raised on L8476 of typeobject.c:

    assert(self->tp_version_tag != 0);

The same failure can be manufactured on macOS with M1 hardware, as long as the test suite is executed as a single process (i.e. python -m test, not the multi-process option enabled by make test).

Full error trace on iOS:
stacktrace.txt

The same problem doesn't appear to occur when debug is not enabled.

CPython versions tested on:

CPython main branch

Operating systems tested on:

macOS, iOS

Output from running 'python -VV' on the command line:

3.14.0a0; verified on 2bac2b86, but possibly present back to dc03ce7

Linked PRs

• gh-121832: Skip subinterpreter static type check on iOS to restore test suite. #122150
• [3.13] gh-121832: Skip subinterpreter static type check on iOS to restore test suite. (GH-122150) #122159
• GH-121832: Assert that the version number of static builtin types is not changed by PyType_Modified. #122182
• [3.13] GH-121832: Assert that the version number of static builtin types is not changed by PyType_Modified. (GH-122182) #122290
• gh-121832: Revert test skip introduced by #122150. #122340
• [3.13] gh-121832: Revert test skip introduced by GH-122150. (GH-122340) #122342