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JIT: _Py_uop_sym_set_recorded_type may receive a non-type at trace optimization time. #148439

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JIT: _Py_uop_sym_set_recorded_type may receive a non-type at trace optimization time.#148439
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interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)topic-JITtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
@Fidget-Spinner

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@Fidget-Spinner
Fidget-Spinner
opened on Apr 12, 2026
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Bug report

Bug description:

_Py_uop_sym_set_recorded_type asserts PyType_Check, but it's possible to have an instance change its __class__/type to a non-PyType_Check-ed class after JIT trace but right before JIT optimization time.

I think the fix is to convert that to a check instead of an assert?

CPython versions tested on:

CPython main branch

Operating systems tested on:

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    interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)topic-JITtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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