stablum commented on issue #19957:
URL: https://github.com/apache/airflow/issues/19957#issuecomment-1095114468

   > The python logs allways seem to show the update query in 
`dagrun.schedule_tis`. It would be most helpful to see the second half of this 
deadlock. In PostgreSQL log there was a hint to `SELECT 
task_instance.try_number AS task_instance_try_number...`, but it was truncated.
   
   I found it:
   ```
   2022-04-11 13:19:13.265 UTC [1774251] airflow_user@airflow_db LOG:  
statement: SELECT task_instance.try_number AS task_instance_try_number, 
task_instance.task_id AS task_instance_task_id, task_instance.dag_id AS 
task_instance_dag_id, task_instance.run_id AS task_instance_run_id, 
task_instance.start_date AS task_instance_start_date, task_instance.end_date AS 
task_instance_end_date, task_instance.duration AS task_instance_duration, 
task_instance.state AS task_instance_state, task_instance.max_tries AS 
task_instance_max_tries, task_instance.hostname AS task_instance_hostname, 
task_instance.unixname AS task_instance_unixname, task_instance.job_id AS 
task_instance_job_id, task_instance.pool AS task_instance_pool, 
task_instance.pool_slots AS task_instance_pool_slots, task_instance.queue AS 
task_instance_queue, task_instance.priority_weight AS 
task_instance_priority_weight, task_instance.operator AS 
task_instance_operator, task_instance.queued_dttm AS task_instance_queued_dttm, 
task_inst
 ance.queued_by_job_id AS task_instance_queued_by_job_id, task_instance.pid AS 
task_instance_pid, task_instance.executor_config AS 
task_instance_executor_config, task_instance.external_executor_id AS 
task_instance_external_executor_id, task_instance.trigger_id AS 
task_instance_trigger_id, task_instance.trigger_timeout AS 
task_instance_trigger_timeout, task_instance.next_method AS 
task_instance_next_method, task_instance.next_kwargs AS 
task_instance_next_kwargs, dag_run_1.state AS dag_run_1_state, dag_run_1.id AS 
dag_run_1_id, dag_run_1.dag_id AS dag_run_1_dag_id, dag_run_1.queued_at AS 
dag_run_1_queued_at, dag_run_1.execution_date AS dag_run_1_execution_date, 
dag_run_1.start_date AS dag_run_1_start_date, dag_run_1.end_date AS 
dag_run_1_end_date, dag_run_1.run_id AS dag_run_1_run_id, 
dag_run_1.creating_job_id AS dag_run_1_creating_job_id, 
dag_run_1.external_trigger AS dag_run_1_external_trigger, dag_run_1.run_type AS 
dag_run_1_run_type, dag_run_1.conf AS dag_run_1_conf, dag_run_1.data
 _interval_start AS dag_run_1_data_interval_start, dag_run_1.data_interval_end 
AS dag_run_1_data_interval_end, dag_run_1.last_scheduling_decision AS 
dag_run_1_last_scheduling_decision, dag_run_1.dag_hash AS dag_run_1_dag_hash 
   
   ```


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