To reproduce, create a venv on python3.12 with the current requirements in build_requirements and test_requirements, then:

spin build --clean -- -Dbuildtype=debug
spin test

On ubuntu 24.04, x86_64, I get a segfault in test_dict_recursion, which is meant to fail with a RecursionError. The other similar tests for recursion properly raise the RecursionError. Setting sys.setrecursionlimit(100) (where it usually is 1000) does not cause the RecursionError to be raised. Is the recursion detection somehow different for dtype-from-dict than for dtype-from-list or dtype-from-tuple?

This is the only test that fails for me when using a debug build.