[3.11] gh-101975: Fixed a potential SegFault on garbage collection (GH-102803) (GH-102807)

markshannon · web-flow · commit d149f15d637a · 2023-03-20T14:42:15.000Z
Authored-by: gaogaotiantian &lt;gaogaotiantian@hotmail.com&gt;
diff --git a/Misc/NEWS.d/next/Core and Builtins/2023-03-18-02-36-39.gh-issue-101975.HwMR1d.rst b/Misc/NEWS.d/next/Core and Builtins/2023-03-18-02-36-39.gh-issue-101975.HwMR1d.rst
@@ -0,0 +1 @@
+Fixed ``stacktop`` value on tracing entries to avoid corruption on garbage collection.
diff --git a/Python/ceval.c b/Python/ceval.c
@@ -1536,6 +1536,7 @@ eval_frame_handle_pending(PyThreadState *tstate)
         _PyFrame_SetStackPointer(frame, stack_pointer); \
         int err = trace_function_entry(tstate, frame); \
         stack_pointer = _PyFrame_GetStackPointer(frame); \
+        frame->stacktop = -1; \
         if (err) { \
             goto error; \
         } \

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.