title: Airflow DAG fails when PythonOperator with error "Negsignal.SIGKILL"
body: <p>I am running Airflowv1.10.15 on Cloud Composer v1.16.16.</p>
  <p>My DAG looks like this :</p>
  <pre><code>from datetime import datetime, timedelta
  
  # imports
  from airflow import DAG
  from airflow.operators.python_operator import PythonOperator
  from airflow.operators.dummy_operator import DummyOperator
  from scripts import workday_extract, workday_config_large
  
  default_args = {
      'owner': 'xxxx',
      'depends_on_past': False,
      'start_date': datetime(2021, 9, 14),
      'email_on_failure': True,
      'email': ['xxxx'],
      'retries': 1,
      'retry_delay': timedelta(minutes=2),
      'catchup': False
  }
  
  
  # Define the DAG with parameters
  dag = DAG(
      dag_id='xxxx_v1',
      schedule_interval='0 20 * * *',
      default_args=default_args,
      catchup=False,
      max_active_runs=1,
      concurrency=1
  )
  
  def wd_to_bq(key, val, **kwargs):
      logger.info(&quot;workday to BQ ingestion&quot;)
      workday_extract.fetch_wd_load_bq(key, val)
  
  
  start_load = DummyOperator(task_id='start', dag=dag)
  
  end_load = DummyOperator(task_id='end', dag=dag)
  
  for key, val in workday_config_large.endpoint_tbl_mapping.items():
      # Task 1: Process the unmatched records from the view
      workday_to_bq = PythonOperator(
          dag=dag,
          task_id=f'{key}',
          execution_timeout=timedelta(minutes=60),
          provide_context=True,
          python_callable=wd_to_bq,
          op_kwargs={'key': key, 'val': val}
      )
      start_load &gt;&gt; workday_to_bq &gt;&gt; end_load
  </code></pre>
  <p>The task fails with error - <strong>Task exited with return code Negsignal.SIGKILL</strong> . The python script runs fine on my local machine and completes in 15 minutes. There are multiple endpoints from which the reports are extracted. However, the one that takes longest ( ~15 minutes) fails with this error and others succeed.</p>
  <p>I have tried a lot of options but none seem to work. Can someone help on this ?</p>