tirkarthi commented on issue #54663:
URL: https://github.com/apache/airflow/issues/54663#issuecomment-3200979130

   I can see below logs in the dag processor. It seems the schedule attribute 
is a frozen attribute that cannot be set.
   
   
https://github.com/apache/airflow/blob/cdfddea9207154cec55d178381869c959a7def42/task-sdk/src/airflow/sdk/definitions/dag.py#L393
   
   ```json
   tail -n 3 
~/airflow/logs/dag_processor/latest/example_dags/example_display_name.py.log | 
python -m json.tool --json-lines
   {
       "timestamp": "2025-08-19T14:18:25.123601Z",
       "level": "info",
       "event": "<DAG: example_display_name>",
       "chan": "stdout",
       "logger": "processor"
   }
   {
       "timestamp": "2025-08-19T14:18:25.114862",
       "level": "error",
       "event": "",
       "logger": "airflow.models.dagbag.DagBag",
       "error_detail": [
           {
               "exc_type": "FrozenAttributeError",
               "exc_value": "",
               "exc_notes": [],
               "syntax_error": null,
               "is_cause": false,
               "frames": [
                   {
                       "filename": 
"/home/karthikeyan/stuff/python/airflow/airflow-core/src/airflow/models/dagbag.py",
                       "lineno": 522,
                       "name": "bag_dag"
                   },
                   {
                       "filename": 
"/home/karthikeyan/stuff/python/airflow/airflow-core/src/airflow/settings.py",
                       "lineno": 177,
                       "name": "dag_policy"
                   },
                   {
                       "filename": 
"/home/karthikeyan/stuff/python/airflow/.venv/lib/python3.11/site-packages/pluggy/_hooks.py",
                       "lineno": 512,
                       "name": "__call__"
                   },
                   {
                       "filename": 
"/home/karthikeyan/stuff/python/airflow/.venv/lib/python3.11/site-packages/pluggy/_manager.py",
                       "lineno": 120,
                       "name": "_hookexec"
                   },
                   {
                       "filename": 
"/home/karthikeyan/stuff/python/airflow/.venv/lib/python3.11/site-packages/pluggy/_callers.py",
                       "lineno": 167,
                       "name": "_multicall"
                   },
                   {
                       "filename": 
"/home/karthikeyan/stuff/python/airflow/.venv/lib/python3.11/site-packages/pluggy/_callers.py",
                       "lineno": 121,
                       "name": "_multicall"
                   },
                   {
                       "filename": 
"/home/karthikeyan/airflow/config/airflow_local_settings.py",
                       "lineno": 7,
                       "name": "dag_policy"
                   },
                   {
                       "filename": 
"/home/karthikeyan/stuff/python/airflow/.venv/lib/python3.11/site-packages/attr/_make.py",
                       "lineno": 1167,
                       "name": "__setattr__"
                   },
                   {
                       "filename": 
"/home/karthikeyan/stuff/python/airflow/.venv/lib/python3.11/site-packages/attr/setters.py",
                       "lineno": 35,
                       "name": "frozen"
                   }
               ],
               "is_group": false,
               "exceptions": []
           }
       ]
   }
   {
       "timestamp": "2025-08-19T14:18:25.115501",
       "level": "error",
       "event": "Failed to bag_dag: 
/home/karthikeyan/stuff/python/airflow/airflow-core/src/airflow/example_dags/example_display_name.py",
       "logger": "airflow.models.dagbag.DagBag",
       "error_detail": [
           {
               "exc_type": "AirflowClusterPolicyError",
               "exc_value": "",
               "exc_notes": [],
               "syntax_error": null,
               "is_cause": false,
               "frames": [
                   {
                       "filename": 
"/home/karthikeyan/stuff/python/airflow/airflow-core/src/airflow/models/dagbag.py",
                       "lineno": 497,
                       "name": "_process_modules"
                   },
                   {
                       "filename": 
"/home/karthikeyan/stuff/python/airflow/airflow-core/src/airflow/models/dagbag.py",
                       "lineno": 540,
                       "name": "bag_dag"
                   }
               ],
               "is_group": false,
               "exceptions": []
           },
           {
               "exc_type": "FrozenAttributeError",
               "exc_value": "",
               "exc_notes": [],
               "syntax_error": null,
               "is_cause": false,
               "frames": [
                   {
                       "filename": 
"/home/karthikeyan/stuff/python/airflow/airflow-core/src/airflow/models/dagbag.py",
                       "lineno": 522,
                       "name": "bag_dag"
                   },
                   {
                       "filename": 
"/home/karthikeyan/stuff/python/airflow/airflow-core/src/airflow/settings.py",
                       "lineno": 177,
                       "name": "dag_policy"
                   },
                   {
                       "filename": 
"/home/karthikeyan/stuff/python/airflow/.venv/lib/python3.11/site-packages/pluggy/_hooks.py",
                       "lineno": 512,
                       "name": "__call__"
                   },
                   {
                       "filename": 
"/home/karthikeyan/stuff/python/airflow/.venv/lib/python3.11/site-packages/pluggy/_manager.py",
                       "lineno": 120,
                       "name": "_hookexec"
                   },
                   {
                       "filename": 
"/home/karthikeyan/stuff/python/airflow/.venv/lib/python3.11/site-packages/pluggy/_callers.py",
                       "lineno": 167,
                       "name": "_multicall"
                   },
                   {
                       "filename": 
"/home/karthikeyan/stuff/python/airflow/.venv/lib/python3.11/site-packages/pluggy/_callers.py",
                       "lineno": 121,
                       "name": "_multicall"
                   },
                   {
                       "filename": 
"/home/karthikeyan/airflow/config/airflow_local_settings.py",
                       "lineno": 7,
                       "name": "dag_policy"
                   },
                   {
                       "filename": 
"/home/karthikeyan/stuff/python/airflow/.venv/lib/python3.11/site-packages/attr/_make.py",
                       "lineno": 1167,
                       "name": "__setattr__"
                   },
                   {
                       "filename": 
"/home/karthikeyan/stuff/python/airflow/.venv/lib/python3.11/site-packages/attr/setters.py",
                       "lineno": 35,
                       "name": "frozen"
                   }
               ],
               "is_group": false,
               "exceptions": []
           }
       ]
   }
   ```


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