Repository sync task on RHUI4 failed with an error "deadlock detected".

Issue

Repository sync task on RHUI4 failed with an error "deadlock detected".

rhui-manager
rhui (home) => s
rhui (sync) => vr

    7 - Error      Red Hat Enterprise Linux 6 Server - Extended Life Cycle Support (RPMs) from RHUI (x86_64)
      deadlock detected
DETAIL:  Process 158239 waits for ShareLock on transaction 26190837; blocked by process 158203.
Process 158203 waits for ShareLock on transaction 26191981; blocked by process 158239.
HINT:  See server log for query details.
CONTEXT:  while locking tuple (3768,56) in relation "core_contentartifact"

 Traceback:        File "/usr/lib/python3.9/site-packages/pulpcore/tasking/pulpcore_worker.py", line 452, in _perform_task
    result = func(*args, **kwargs)
  File "/usr/lib/python3.9/site-packages/pulp_rpm/app/tasks/synchronizing.py", line 559, in synchronize
    repo_version = dv.create() or repo.latest_version()
  File "/usr/lib/python3.9/site-packages/pulpcore/plugin/stages/declarative_version.py", line 161, in create
    loop.run_until_complete(pipeline)
  File "/usr/lib64/python3.9/asyncio/base_events.py", line 647, in run_until_complete
    return future.result()
  File "/usr/lib/python3.9/site-packages/pulpcore/plugin/stages/api.py", line 225, in create_pipeline
    await asyncio.gather(*futures)
  File "/usr/lib/python3.9/site-packages/pulpcore/plugin/stages/api.py", line 43, in __call__
    await self.run()
  File "/usr/lib/python3.9/site-packages/pulpcore/plugin/stages/content_stages.py", line 197, in run
    await sync_to_async(process_batch)()
  File "/usr/lib/python3.9/site-packages/asgiref/sync.py", line 435, in __call__
    ret = await asyncio.wait_for(future, timeout=None)
  File "/usr/lib64/python3.9/asyncio/tasks.py", line 442, in wait_for
    return await fut
  File "/usr/lib64/python3.9/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/lib/python3.9/site-packages/asgiref/sync.py", line 476, in thread_handler
    return func(*args, **kwargs)
  File "/usr/lib/python3.9/site-packages/pulpcore/plugin/stages/content_stages.py", line 186, in process_batch
    len(subq.values_list())
  File "/usr/lib/python3.9/site-packages/django/db/models/query.py", line 262, in __len__
    self._fetch_all()
  File "/usr/lib/python3.9/site-packages/django/db/models/query.py", line 1324, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "/usr/lib/python3.9/site-packages/django/db/models/query.py", line 140, in __iter__
    return compiler.results_iter(tuple_expected=True, chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
  File "/usr/lib/python3.9/site-packages/django/db/models/sql/compiler.py", line 1130, in results_iter
    results = self.execute_sql(MULTI, chunked_fetch=chunked_fetch, chunk_size=chunk_size)
  File "/usr/lib/python3.9/site-packages/django/db/models/sql/compiler.py", line 1175, in execute_sql
    cursor.execute(sql, params)
  File "/usr/lib/python3.9/site-packages/django/db/backends/utils.py", line 66, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "/usr/lib/python3.9/site-packages/django/db/backends/utils.py", line 75, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "/usr/lib/python3.9/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "/usr/lib/python3.9/site-packages/django/db/utils.py", line 90, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/usr/lib/python3.9/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)