sushi30 opened a new issue #19385:
URL: https://github.com/apache/airflow/issues/19385
### Apache Airflow version
2.2.1 (latest released)
### Operating System
Centos 7
### Versions of Apache Airflow Providers
_No response_
### Deployment
Official Apache Airflow Helm Chart
### Deployment details
_No response_
### What happened
After upgrade to Airflow 2.2.1, an existing DAG failed with the following
error after which the scheduler crashes:
```python
[2021-11-03 14:52:39,739] {dagrun.py:715} WARNING - Failed to record
duration of <DagRun
housekeeping_unified_test.add_partitions_unified_test_public @ 2021-11-03
13:37:54.190276+00:00: scheduled__2021-11-03T13:37:54.190276+00:00, externally
triggered: True>: start_date is not set.
[2021-11-03 14:52:39,743] {scheduler_job.py:644} ERROR - Exception when
executing SchedulerJob._run_scheduler_loop
Traceback (most recent call last):
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/jobs/scheduler_job.py",
line 628, in _execute
self._run_scheduler_loop()
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/jobs/scheduler_job.py",
line 709, in _run_scheduler_loop
num_queued_tis = self._do_scheduling(session)
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/jobs/scheduler_job.py",
line 792, in _do_scheduling
callback_to_run = self._schedule_dag_run(dag_run, session)
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/jobs/scheduler_job.py",
line 1044, in _schedule_dag_run
self._update_dag_next_dagruns(dag, dag_model, active_runs)
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/jobs/scheduler_job.py",
line 935, in _update_dag_next_dagruns
data_interval = dag.get_next_data_interval(dag_model)
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/models/dag.py", line
629, in get_next_data_interval
return self.infer_automated_data_interval(dag_model.next_dagrun)
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/models/dag.py", line
669, in infer_automated_data_interval
end = cast(DeltaDataIntervalTimetable, self.timetable)._get_next(start)
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/timetables/interval.py",
line 278, in _get_next
return convert_to_utc(current + self._delta)
TypeError: unsupported operand type(s) for +: 'NoneType' and
'datetime.timedelta'
```
### What you expected to happen
1. DAG to continue running.
2. Scheduler should not fail.
### How to reproduce
I am still finding a reproducible minimal setup.
### Anything else
Every time this DAG is turned on.
### Are you willing to submit PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [X] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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