1 files changed, 6 insertions, 2 deletions
diff --git a/Modules/_testcapimodule.c b/Modules/_testcapimodule.c
index f45d031..e2ebab5 100644
--- a/Modules/_testcapimodule.c
+++ b/Modules/_testcapimodule.c
@@ -1538,15 +1538,19 @@ run_in_subinterp_with_config(PyObject *self, PyObject *args, PyObject *kwargs)
         .allow_daemon_threads = allow_daemon_threads,
         .check_multi_interp_extensions = check_multi_interp_extensions,
     };
-    substate = _Py_NewInterpreterFromConfig(&config);
-    if (substate == NULL) {
+    PyStatus status = _Py_NewInterpreterFromConfig(&substate, &config);
+    if (PyStatus_Exception(status)) {
         /* Since no new thread state was created, there is no exception to
            propagate; raise a fresh one after swapping in the old thread
            state. */
         PyThreadState_Swap(mainstate);
+        _PyErr_SetFromPyStatus(status);
+        PyObject *exc = PyErr_GetRaisedException();
         PyErr_SetString(PyExc_RuntimeError, "sub-interpreter creation failed");
+        _PyErr_ChainExceptions1(exc);
         return NULL;
     }
+    assert(substate != NULL);
     r = PyRun_SimpleStringFlags(code, &cflags);
     Py_EndInterpreter(substate);