From 5c4bb9b7f6a779351afcdd76f390c572b3c1dc06 Mon Sep 17 00:00:00 2001
From: Kumar Aditya <kumaraditya@python.org>
Date: Mon, 15 Sep 2025 20:09:15 +0530
Subject: [PATCH] gh-137992: fix `PyRefTracer_SetTracer` to start world before
 returning  (#138925)

fix deadlock in PyRefTracer_SetTracer
---
 Objects/object.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Objects/object.c b/Objects/object.c
index c9bcc0c7b09e..1f10c2531fea 100644
--- a/Objects/object.c
+++ b/Objects/object.c
@@ -3292,6 +3292,7 @@ int PyRefTracer_SetTracer(PyRefTracer tracer, void *data) {
     if (_PyRuntime.ref_tracer.tracer_func != NULL) {
         _PyReftracerTrack(NULL, PyRefTracer_TRACKER_REMOVED);
         if (PyErr_Occurred()) {
+            _PyEval_StartTheWorldAll(&_PyRuntime);
             return -1;
         }
     }
-- 
2.47.3