gh-137992: fix PyRefTracer_SetTracer to start world before returning (#138925)

kumaraditya303 · web-flow · commit 5c4bb9b7f6a7 · 2025-09-15T15:39:15.000+01:00
fix deadlock in PyRefTracer_SetTracer
diff --git 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;
         }
     }

Original file line number	Diff line number	Diff line change
`@@ -3292,6 +3292,7 @@ int PyRefTracer_SetTracer(PyRefTracer tracer, void *data) {`
`3292`	`3292`	`if (_PyRuntime.ref_tracer.tracer_func != NULL) {`
`3293`	`3293`	`_PyReftracerTrack(NULL, PyRefTracer_TRACKER_REMOVED);`
`3294`	`3294`	`if (PyErr_Occurred()) {`
	`3295`	`+ _PyEval_StartTheWorldAll(&_PyRuntime);`
`3295`	`3296`	`return -1;`
`3296`	`3297`	`}`
`3297`	`3298`	`}`