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faulthandler's dump_traceback doesn't handle case where top-most frame is FRAME_OWNED_BY_CSTACK #123967

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faulthandler's dump_traceback doesn't handle case where top-most frame is FRAME_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
colesbury
opened on Sep 11, 2024

Bug report

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

cpython/Python/traceback.c

Lines 979 to 982 in 3bd942f

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

But if tstate->current_frame is a trampoline frame (i.e., FRAME_OWNED_BY_CSTACK) then dump_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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