bugcastershelp wanted
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Description
in particular use of loader_life_support seems problematic. This function keeps state in the global loader_patient_stack: https://github.com/pybind/pybind11/blob/b7dfe5cc84ca1891b50e728e83c9b5b393cf5272/include/pybind11/detail/internals.h#L105 In the case where a cast can release the GIL, two thread's push/pop of loader_patient_stack can become interleaved.
While releasing the GIL in a conversion seems like a bad idea, it can be surprisingly hard to avoid. Any cast that results in the bytecode interpreter being run (either directly or through something like a __del__ method) can cause python itself to release GIL (sys.setswitchinterval).