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faulthandler'sdump_traceback doesn't handle case where top-most frame isFRAME_OWNED_BY_CSTACK #123967

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3.12only security fixes3.13bugs and security fixes3.14bugs and security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error
@colesbury

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@colesbury

Bug report

We properly skip trampoline frames when they are not the top-most frame:

if (frame->owner==FRAME_OWNED_BY_CSTACK) {
/* Trampoline frame */
frame=frame->previous;
}

But iftstate->current_frame is a trampoline frame (i.e.,FRAME_OWNED_BY_CSTACK) thendump_traceback will crash if faulthandler is triggered when executing a trampoline frame.

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    3.12only security fixes3.13bugs and security fixes3.14bugs and security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error

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