dimberman opened a new pull request #6732: fixes scheduler queue bug
URL: https://github.com/apache/airflow/pull/6732
 
 
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   ### Jira
   
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   ### Description
   
   - [ ] Here are some details about my PR, including screenshots of any UI 
changes:
   
   There is a bug caused by scheduler_jobs refactor which leads to task failure 
and scheduler locking.
   
   Essentially when a there is an overflow of tasks going into the scheduler, 
the tasks are set back to scheduled, but are not removed from the executor's 
queued_tasks queue.
   
   This means that the executor will attempt to run tasks that are in the 
scheduled state, but those tasks will fail dependency checks. Eventually the 
queue is filled with scheduled tasks, and the scheduler can no longer run.
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   ### Documentation
   
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we can assign it to a appropriate release
   

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