renyu-capsule commented on issue #54550:
URL: https://github.com/apache/airflow/issues/54550#issuecomment-3259245798

   @TejasMorbagal @ruslanfialkovskii thanks for sharing, I can confirm that 
this caused the issue for me.
   ```
     - name: PYTHONPATH
       value: "/opt/airflow/dags/repo/dags:${PYTHONPATH}"
   ```
   
   basically the self reference has led to infinite loop when scheduler tries 
to load and expand vars: 
https://github.com/apache/airflow/blob/6f3927b271bc778e544f7cef478951103de9959d/airflow-core/src/airflow/configuration.py#L124


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