Python PostCommit python:flinkCompatibilityMatrixBatchDOCKER fails

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 ERROR: test_pardo_unfusable_side_inputs (_main_.FlinkRunnerTest)
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 Traceback (most recent call last):
 File "apache_beam/runners/portability/fn_api_runner_test.py", line 254, in test_pardo_unfusable_side_inputs
 equal_to([('a', 'a'), ('a', 'b'), ('b', 'a'), ('b', 'b')]))
 File "apache_beam/pipeline.py", line 425, in _exit_
 self.run().wait_until_finish()
 File "apache_beam/runners/portability/portable_runner.py", line 242, in wait_until_finish
 beam_job_api_pb2.GetJobStateRequest(job_id=self._job_id)):
 File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python_VR_Flink/src/sdks/python/build/gradleenv/local/lib/python2.7/site-packages/grpc/_channel.py", line 367, in next
 return self._next()
 File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python_VR_Flink/src/sdks/python/build/gradleenv/local/lib/python2.7/site-packages/grpc/_channel.py", line 349, in _next
 self._state.condition.wait()
 File "/usr/lib/python2.7/threading.py", line 340, in wait
 waiter.acquire()
 File "apache_beam/runners/portability/portable_runner_test.py", line 69, in handler
 raise BaseException(msg)
 ==================== Timed out after 30 seconds. ====================
 BaseException: Timed out after 30 seconds.
[...]
Segmentation fault (core dumped)