The GitHub Actions job "Tests" on 
airflow.git/fix/thread-safe-auth-manager-init-v2 has failed.
Run started by GitHub user kimyoungi99 (triggered by kimyoungi99).

Head commit for run:
2f823601d4cab9e79fd310e9d5ee078f60570450 / kimyoungi99 <[email protected]>
Serialize init_app() to prevent concurrent get_application_builder() races

FAB FastAPI routes call get_application_builder() on every request,
which creates a new Flask app and invokes init_app(). Concurrent calls
race on the singleton auth_manager's appbuilder and security_manager,
causing KeyError: 'AUTH_USER_REGISTRATION' and AttributeError.

Add _init_app_lock around the critical section in init_app() that
mutates the singleton auth_manager state and registers views, so
concurrent get_application_builder() calls are serialized.

Report URL: https://github.com/apache/airflow/actions/runs/22470484324

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