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

Bug report

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

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.

Linked PRs

pythongh-123967: Fix faulthandler for trampoline frames

gh-123967: Fix faulthandler for trampoline frames (#127329)

pythongh-123967: Fix faulthandler for trampoline frames (pythonGH-127329

[3.12] gh-123967: Fix faulthandler for trampoline frames (#127329) (#…

[3.13] gh-123967: Fix faulthandler for trampoline frames (GH-127329) (#…

Closing since completed and backported.

pythongh-123967: Fix faulthandler for trampoline frames (python#127329)

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

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

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picnixz commented on Nov 30, 2024

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