kaxil opened a new pull request, #54362:
URL: https://github.com/apache/airflow/pull/54362
The error occurred when trying to access `dag_run.created_dag_version` on a
DagRun object that was detached from its SQLAlchemy session.
Stacktrace:
```
[2025-08-08T19:03:28.761+0000] {scheduler_job_runner.py:935} ERROR - Marking
task instance <TaskInstance:
sell_oms_shipconfirm_mao_to_ecom_load_delta_quarterly.shipconfirm_delta_to_kafka_notebook_task
scheduled__2025-08-08T07:30:00+00:00 [running]> as failed
Traceback (most recent call last):
File
"/usr/local/lib/python3.12/site-packages/airflow/jobs/scheduler_job_runner.py",
line 925, in process_executor_events
dag = scheduler_dag_bag.get_dag(dag_run=ti.dag_run, session=session)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/usr/local/lib/python3.12/site-packages/airflow/jobs/scheduler_job_runner.py",
line 141, in get_dag
version = self._version_from_dag_run(dag_run=dag_run, session=session)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/usr/local/lib/python3.12/site-packages/airflow/jobs/scheduler_job_runner.py",
line 135, in _version_from_dag_run
dag_version = dag_run.created_dag_version
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/usr/local/lib/python3.12/site-packages/sqlalchemy/orm/attributes.py", line
487, in __get__
return self.impl.get(state, dict_)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/usr/local/lib/python3.12/site-packages/sqlalchemy/orm/attributes.py", line
959, in get
value = self._fire_loader_callables(state, key, passive)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/usr/local/lib/python3.12/site-packages/sqlalchemy/orm/attributes.py", line
995, in _fire_loader_callables
return self.callable_(state, passive)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/usr/local/lib/python3.12/site-packages/sqlalchemy/orm/strategies.py", line
863, in _load_for_state
raise orm_exc.DetachedInstanceError(
sqlalchemy.orm.exc.DetachedInstanceError: Parent instance <DagRun at
0x7f46d309a5d0> is not bound to a Session; lazy load operation of attribute
'created_dag_version' cannot proceed (Background on this error at:
https://sqlalche.me/e/14/bhk3)
```
Two-layer fix:
1. Proactive loading: Add `selectinload` for `created_dag_version` in
`process_executor_events` query to ensure optimal performance for this critical
path
2. Defensive code: Add relationship loading check in
`DBDagBag._version_from_dag_run` to handle all call sites safely using
SQLAlchemy inspect pattern
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