[3.12] gh-123967: Fix faulthandler for trampoline frames (#127329) (#127363)

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

If the top-most frame is a trampoline frame, skip it.

(cherry picked from commit 58e334e)

Author: vstinner

Misc/NEWS.d/next/Library/2024-11-27-14-06-35.gh-issue-123967.wxUmnW.rst

@@ -0,0 +1,2 @@
+Fix faulthandler for trampoline frames. If the top-most frame is a
+trampoline frame, skip it. Patch by Victor Stinner.

Python/traceback.c

@@ -1242,6 +1242,8 @@ _Py_DumpASCII(int fd, PyObject *text)
 static void
 dump_frame(int fd, _PyInterpreterFrame *frame)
 {
+    assert(frame->owner != FRAME_OWNED_BY_CSTACK);
+
     PyCodeObject *code = frame->f_code;
     PUTS(fd, "  File ");
     if (code->co_filename != NULL
@@ -1315,24 +1317,27 @@ dump_traceback(int fd, PyThreadState *tstate, int write_header)
 
     unsigned int depth = 0;
     while (1) {
+        if (frame->owner == FRAME_OWNED_BY_CSTACK) {
+            /* Trampoline frame */
+            frame = frame->previous;
+            if (frame == NULL) {
+                break;
+            }
+
+            /* Can't have more than one shim frame in a row */
+            assert(frame->owner != FRAME_OWNED_BY_CSTACK);
+        }
+
         if (MAX_FRAME_DEPTH <= depth) {
             PUTS(fd, "  ...\n");
             break;
         }
+
         dump_frame(fd, frame);
         frame = frame->previous;
         if (frame == NULL) {
             break;
         }
-        if (frame->owner == FRAME_OWNED_BY_CSTACK) {
-            /* Trampoline frame */
-            frame = frame->previous;
-        }
-        if (frame == NULL) {
-            break;
-        }
-        /* Can't have more than one shim frame in a row */
-        assert(frame->owner != FRAME_OWNED_BY_CSTACK);
         depth++;
     }
 }