caleboverman commented on issue #13542:
URL: https://github.com/apache/airflow/issues/13542#issuecomment-875929266


   We've just migrated to `2.1.1` and are continuing to see tasks stuck in 
`Scheduled` using the `LocalExecutor`.
   
   In our case, Airflow seems to kick off tasks as expected until a DAG reaches 
it's concurrency limit (which we typically set at the individual DAG level 
instead of globally). Once a DAG hits the concurrency limit then tasks in other 
DAGs don't start executing despite Airflow having open executor slots. We're 
only making use of the `default_pool` and tasks are moving from `Queued` to 
`Running` there but aren't entering the queue despite being in a `Scheduled` 
state.


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