[INFO:2021-09-22 06:08:41,637]: Triggering test 37 of 882...
[INFO:2021-09-22 06:08:41,650]: RunnerClient: Loading test {'directory': '/opt/kafka-dev/tests/kafkatest/tests/core', 'file_name': 'throttling_test.py', 'cls_name': 'ThrottlingTest', 'method_name': 'test_throttled_reassignment', 'injected_args': {'bounce_brokers': False}}
[INFO:2021-09-22 06:08:41,658]: RunnerClient: kafkatest.tests.core.throttling_test.ThrottlingTest.test_throttled_reassignment.bounce_brokers=False: Setting up...
[INFO:2021-09-22 06:08:45,039]: RunnerClient: kafkatest.tests.core.throttling_test.ThrottlingTest.test_throttled_reassignment.bounce_brokers=False: Running...
[INFO:2021-09-22 06:09:22,849]: RunnerClient: kafkatest.tests.core.throttling_test.ThrottlingTest.test_throttled_reassignment.bounce_brokers=False: FAIL: AttributeError("'Thread' object has no attribute 'isAlive'")
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/dist-packages/ducktape/tests/runner_client.py", line 133, in run
    data = self.run_test()
  File "/usr/local/lib/python3.9/dist-packages/ducktape/tests/runner_client.py", line 190, in run_test
    return self.test_context.function(self.test)
  File "/usr/local/lib/python3.9/dist-packages/ducktape/mark/_mark.py", line 429, in wrapper
    return functools.partial(f, *args, **kwargs)(*w_args, **w_kwargs)
  File "/opt/kafka-dev/tests/kafkatest/tests/core/throttling_test.py", line 172, in test_throttled_reassignment
    bulk_producer.run()
  File "/usr/local/lib/python3.9/dist-packages/ducktape/services/service.py", line 318, in run
    self.stop()
  File "/opt/kafka-dev/tests/kafkatest/services/monitor/http.py", line 97, in stop
    super(HttpMetricsCollector, self).stop()
  File "/usr/local/lib/python3.9/dist-packages/ducktape/services/background_thread.py", line 84, in stop
    super(BackgroundThreadService, self).stop()
  File "/usr/local/lib/python3.9/dist-packages/ducktape/services/service.py", line 281, in stop
    self.stop_node(node)
  File "/opt/kafka-dev/tests/kafkatest/services/monitor/http.py", line 109, in stop_node
    self._forwarders[idx].stop()
  File "/opt/kafka-dev/tests/kafkatest/services/monitor/http.py", line 191, in stop
    if self._accept_thread.isAlive():
AttributeError: 'Thread' object has no attribute 'isAlive'