potiuk commented on pull request #21464:
URL: https://github.com/apache/airflow/pull/21464#issuecomment-1034041354


   > Do we know how to reliably trigger the bug so we can test it's fixed when 
we reintroduce this changeset?
   
   Actually .... this does not seem like it ... 
   
   The last run when I was using `Public Runners` actually triggered it - so my 
hypothesis was wrong. 
   
   
https://github.com/apache/airflow/runs/5128289741?check_suite_focus=true#step:7:2081
   
   ````
   airflow-webserver_1  |   File 
"/home/airflow/.local/lib/python3.7/site-packages/sqlalchemy/orm/dependency.py",
 line 553, in process_deletes
   airflow-webserver_1  |     state, child, None, True, uowcommit, False
   airflow-webserver_1  |   File 
"/home/airflow/.local/lib/python3.7/site-packages/sqlalchemy/orm/dependency.py",
 line 610, in _synchronize
   airflow-webserver_1  |     sync.clear(dest, self.mapper, 
self.prop.synchronize_pairs)
   airflow-webserver_1  |   File 
"/home/airflow/.local/lib/python3.7/site-packages/sqlalchemy/orm/sync.py", line 
88, in clear
   airflow-webserver_1  |     "column '%s' on instance '%s'" % (r, 
orm_util.state_str(dest))
   airflow-webserver_1  | AssertionError: Dependency rule tried to blank-out 
primary key column 'ab_permission.id' on instance '<Action at 0x7ff72cb09310>'
   ```
   
   We need to look more. But it seems that it's rather reliably triggered on 
Public runners.


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