Merge pull request #5152 from microDev1/traceback

Fix crash on raise of reload exception

Author: dhalbert

py/mpstate.h

@@ -146,6 +146,8 @@ typedef struct _mp_state_vm_t {
 
     // exception object of type ReloadException
     mp_obj_exception_t mp_reload_exception;
+    // traceback object to store traceback
+    mp_obj_traceback_t mp_reload_traceback;
 
     // dictionary with loaded modules (may be exposed as sys.modules)
     mp_obj_dict_t mp_loaded_modules_dict;

py/runtime.c

@@ -86,7 +86,8 @@ void mp_init(void) {
 
     MP_STATE_VM(mp_reload_exception).base.type = &mp_type_ReloadException;
     MP_STATE_VM(mp_reload_exception).args = (mp_obj_tuple_t *)&mp_const_empty_tuple_obj;
-    MP_STATE_VM(mp_reload_exception).traceback = (mp_obj_traceback_t *)&mp_const_empty_traceback_obj;
+    MP_STATE_VM(mp_reload_exception).traceback = &MP_STATE_VM(mp_reload_traceback);
+    *MP_STATE_VM(mp_reload_exception).traceback = mp_const_empty_traceback_obj;
 
     // call port specific initialization if any
     #ifdef MICROPY_PORT_INIT_FUNC