dmgburg opened a new issue #12912:
URL: https://github.com/apache/airflow/issues/12912
**Apache Airflow version**:
1.10.12
**What happened**:
I created dag with dagrun_timeout=2 minutes.
After 2 minutes dagrun is marked as failed and the next one is started, but
task keeps going.
**What you expected to happen**:
Task is killed with dag run as it is done when you mark dagrun failed
manually.
**How to reproduce it**:
```
dag = DAG(dag_id='platform.airflow-test',
# FIXME: TypeError: object of type 'NoneType' has no len()
description='',
schedule_interval="0 0 * * *",
start_date=datetime(2020, 7, 1),
max_active_runs=1,
catchup=True,
dagrun_timeout=timedelta(minutes=2))
run_this = BashOperator(
task_id='run_after_loop',
bash_command=' for((i=1;i<=600;i+=1)); do echo "Welcome $i times"; sleep
1; done',
dag=dag,
)
```
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