gh-101975: Fixed a potential SegFault on garbage collection (GH-102803) · python/cpython@039714d · GitHub

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gh-101975: Fixed a potential SegFault on garbage collection (GH-102803)

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• Misc/NEWS.d/next/Core and Builtins
  • 2023-03-18-02-36-39.gh-issue-101975.HwMR1d.rst
• Python
  • ceval_macros.h

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‎Misc/NEWS.d/next/Core and Builtins/2023-03-18-02-36-39.gh-issue-101975.HwMR1d.rst‎

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Original file line number	Diff line number	Diff line change
@@ -0,0 +1 @@
	1	+ Fixed ``stacktop`` value on tracing entries to avoid corruption on garbage collection.

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‎Python/ceval_macros.h‎

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Original file line number	Diff line number	Diff line change
@@ -310,6 +310,7 @@ GETITEM(PyObject *v, Py_ssize_t i) {
310	310	_PyFrame_SetStackPointer(frame, stack_pointer); \
311	311	int err = trace_function_entry(tstate, frame); \
312	312	stack_pointer = _PyFrame_GetStackPointer(frame); \
	313	+ frame->stacktop = -1; \
313	314	if (err) { \
314	315	goto error; \
315	316	} \

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