diff --git a/Lib/test/test__xxsubinterpreters.py b/Lib/test/test__xxsubinterpreters.py
index 7baea69a4e5..49e4d0b95b6 100644
--- a/Lib/test/test__xxsubinterpreters.py
+++ b/Lib/test/test__xxsubinterpreters.py
@@ -42,7 +42,10 @@ def _run_output(interp, request, shared=None):
 @contextlib.contextmanager
 def _running(interp):
     r, w = os.pipe()
+    interpreters.list_all()
+    done = threading.Event()
     def run():
+        done.set()
         interpreters.run_string(interp, dedent(f"""
             # wait for "signal"
             with open({r}, encoding="utf-8") as rpipe:
@@ -51,6 +54,8 @@ def run():

     t = threading.Thread(target=run)
     t.start()
+    done.wait()
+    interpreters.list_all()

     yield

diff --git a/Modules/_threadmodule.c b/Modules/_threadmodule.c
index 5b5d2c5b03e..554049be1b3 100644
--- a/Modules/_threadmodule.c
+++ b/Modules/_threadmodule.c
@@ -1090,6 +1090,7 @@ thread_run(void *boot_raw)
 #endif
     _PyThreadState_Init(tstate);
     PyEval_AcquireThread(tstate);
+    //printf("In thread_run, the current state is: %p\n", tstate);
     tstate->interp->num_threads++;

     PyObject *res = PyObject_Call(boot->func, boot->args, boot->kwargs);
diff --git a/Modules/_xxsubinterpretersmodule.c b/Modules/_xxsubinterpretersmodule.c
index 9290255c66c..e03c5f11307 100644
--- a/Modules/_xxsubinterpretersmodule.c
+++ b/Modules/_xxsubinterpretersmodule.c
@@ -1958,6 +1958,9 @@ _run_script_in_interpreter(PyInterpreterState *interp, const char *codestr,
     _sharedexception *exc = NULL;
     int result = _run_script(interp, codestr, shared, &exc);

+    PyThreadState *current_tstate = PyThreadState_Get();
+    printf("After interp runs, the current state is: %p\n", current_tstate);
+
     // Switch back.
     if (save_tstate != NULL) {
         PyThreadState_Swap(save_tstate);
@@ -2008,7 +2011,8 @@ _global_channels(void) {
 static PyObject *
 interp_create(PyObject *self, PyObject *args, PyObject *kwds)
 {
-
+    PyThreadState *current_tstate = PyThreadState_Get();
+    printf("In interp_create, the current state is: %p\n", current_tstate);
     static char *kwlist[] = {"isolated", NULL};
     int isolated = 1;
     if (!PyArg_ParseTupleAndKeywords(args, kwds, "|$i:create", kwlist,
@@ -2104,6 +2108,8 @@ So does an unrecognized ID.");
 static PyObject *
 interp_list_all(PyObject *self, PyObject *Py_UNUSED(ignored))
 {
+    PyThreadState *current_tstate = PyThreadState_Get();
+    printf("In interp_list_all, the current state is: %p\n", current_tstate);
     PyObject *ids, *id;
     PyInterpreterState *interp;

@@ -2172,6 +2178,8 @@ Return the ID of main interpreter.");
 static PyObject *
 interp_run_string(PyObject *self, PyObject *args, PyObject *kwds)
 {
+    PyThreadState *current_tstate = PyThreadState_Get();
+    printf("Before interp runs, the current state is: %p\n", current_tstate);
     static char *kwlist[] = {"id", "script", "shared", NULL};
     PyObject *id, *code;
     PyObject *shared = NULL;