workaround main sub interp crashes

Author: neonene

Modules/_datetimemodule.c

@@ -7130,14 +7130,19 @@ callback_for_interp_exit(void *Py_UNUSED(data))
 
     assert(_globals.interp_count > 0);
     PyMutex_Lock(&_globals.mutex);
-    int64_t final = !_globals.interp_count;
     _globals.interp_count -= 1;
+    int final = !_globals.interp_count;
     PyMutex_Unlock(&_globals.mutex);
 
+    /* Finish from parent to child */
     for (size_t i = 0; i < Py_ARRAY_LENGTH(capi_types); i++) {
         PyTypeObject *type = capi_types[i];
         _PyStaticType_FiniForExtension(interp, type, final);
     }
+    /* Clear indexes all at once */
+    for (size_t i = 0; i < Py_ARRAY_LENGTH(capi_types); i++) {
+        capi_types[i]->tp_subclasses = NULL;;
+    }
 }
 
 static int
@@ -7153,6 +7158,7 @@ init_static_types(PyInterpreterState *interp, int reloading)
     PyDateTime_TimeZoneType.tp_base = &PyDateTime_TZInfoType;
     PyDateTime_DateTimeType.tp_base = &PyDateTime_DateType;
 
+    /* Init from parent to child */
     for (size_t i = 0; i < Py_ARRAY_LENGTH(capi_types); i++) {
         PyTypeObject *type = capi_types[i];
         if (_PyStaticType_InitForExtension(interp, type) < 0) {

Objects/typeobject.c

@@ -252,7 +252,7 @@ managed_static_type_state_clear(PyInterpreterState *interp, PyTypeObject *self,
     state->type = NULL;
     assert(state->tp_weaklist == NULL);  // It was already cleared out.
 
-    if (final) {
+    if (final && isbuiltin) {
         managed_static_type_index_clear(self);
     }
 
@@ -400,7 +400,9 @@ set_tp_bases(PyTypeObject *self, PyObject *bases)
     if (self->tp_flags & _Py_TPFLAGS_STATIC_BUILTIN) {
         // XXX tp_bases can probably be statically allocated for each
         // static builtin type.
-        assert(_Py_IsMainInterpreter(_PyInterpreterState_GET()));
+        PyInterpreterState *interp = _PyInterpreterState_GET();
+        managed_static_type_state *state = managed_static_type_state_get(interp, self);
+        assert(!state->isbuiltin || _Py_IsMainInterpreter(interp));
         assert(self->tp_bases == NULL);
         if (PyTuple_GET_SIZE(bases) == 0) {
             assert(self->tp_base == NULL);
@@ -473,7 +475,9 @@ set_tp_mro(PyTypeObject *self, PyObject *mro)
     if (self->tp_flags & _Py_TPFLAGS_STATIC_BUILTIN) {
         // XXX tp_mro can probably be statically allocated for each
         // static builtin type.
-        assert(_Py_IsMainInterpreter(_PyInterpreterState_GET()));
+        PyInterpreterState *interp = _PyInterpreterState_GET();
+        managed_static_type_state *state = managed_static_type_state_get(interp, self);
+        assert(!state->isbuiltin || _Py_IsMainInterpreter(interp));
         assert(self->tp_mro == NULL);
         /* Other checks are done via set_tp_bases. */
         _Py_SetImmortal(mro);
@@ -7832,7 +7836,9 @@ static int
 type_ready_set_bases(PyTypeObject *type)
 {
     if (type->tp_flags & _Py_TPFLAGS_STATIC_BUILTIN) {
-        if (!_Py_IsMainInterpreter(_PyInterpreterState_GET())) {
+        PyInterpreterState *interp = _PyInterpreterState_GET();
+        managed_static_type_state *state = managed_static_type_state_get(interp, type);
+        if (state->isbuiltin && !_Py_IsMainInterpreter(interp)) {
             assert(lookup_tp_bases(type) != NULL);
             return 0;
         }
@@ -7966,7 +7972,9 @@ type_ready_mro(PyTypeObject *type)
     ASSERT_TYPE_LOCK_HELD();
 
     if (type->tp_flags & _Py_TPFLAGS_STATIC_BUILTIN) {
-        if (!_Py_IsMainInterpreter(_PyInterpreterState_GET())) {
+        PyInterpreterState *interp = _PyInterpreterState_GET();
+        managed_static_type_state *state = managed_static_type_state_get(interp, type);
+        if (state->isbuiltin && !_Py_IsMainInterpreter(interp)) {
             assert(lookup_tp_mro(type) != NULL);
             return 0;
         }