Traceback (most recent call last):


 "/usr/lib/python3.6/site-packages/urllib3/connectionpool.py", line 600, in urlopen

chunked=chunked)


 "/usr/lib/python3.6/site-packages/urllib3/connectionpool.py", line 343, in _make_request

self._validate_conn(conn)


 "/usr/lib/python3.6/site-packages/urllib3/connectionpool.py", line 839, in _validate_conn

conn.connect()


 "/usr/lib/python3.6/site-packages/urllib3/connection.py", line 344, in connect

ssl_context=context)


 "/usr/lib/python3.6/site-packages/urllib3/util/ssl_.py", line 354, in ssl_wrap_socket

return context.wrap_socket(sock, server_hostname=server_hostname)


 "/usr/lib64/python3.6/ssl.py", line 365, in wrap_socket

_context=self, _session=session)


 "/usr/lib64/python3.6/ssl.py", line 776, in __init__

self.do_handshake()


 "/usr/lib64/python3.6/ssl.py", line 1036, in do_handshake

self._sslobj.do_handshake()


 "/usr/lib64/python3.6/ssl.py", line 648, in do_handshake

self._sslobj.do_handshake()
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:897)

Traceback (most recent call last):


 "/home/factory/PerfKitBenchmarker/perfkitbenchmarker/background_tasks.py", line 255, in Run

self.return_value = self.target(*self.args, **self.kwargs)


 "/home/factory/PerfKitBenchmarker/perfkitbenchmarker/linux_benchmarks/cassandra_stress_benchmark.py", line 404, in RunTestOnLoader

threads=FLAGS.num_cassandra_stress_threads))


 "/home/factory/PerfKitBenchmarker/perfkitbenchmarker/linux_virtual_machine.py", line 281, in RobustRemoteCommand

return _WaitForCommand()


 "/home/factory/PerfKitBenchmarker/perfkitbenchmarker/linux_virtual_machine.py", line 278, in _WaitForCommand

ignore_failure=ignore_failure)


 "/home/factory/PerfKitBenchmarker/perfkitbenchmarker/linux_virtual_machine.py", line 724, in RemoteCommand

return self.RemoteCommandWithReturnCode(*args, **kwargs)[:2]


 "/home/factory/PerfKitBenchmarker/perfkitbenchmarker/linux_virtual_machine.py", line 740, in RemoteCommandWithReturnCode

return self.RemoteHostCommandWithReturnCode(*args, **kwargs)


 "/home/factory/PerfKitBenchmarker/perfkitbenchmarker/linux_virtual_machine.py", line 812, in RemoteHostCommandWithReturnCode

raise errors.VirtualMachine.RemoteCommandError(error_text)
RemoteCommandError: Got non-zero return code (1) executing python /tmp/pkb/wait_for_command.py --status /tmp/pkb/cmd0f419fc8-ddb3-4f79-97f7-a259688defb1.status --stdout /tmp/pkb/cmd0f419fc8-ddb3-4f79-97f7-a259688defb1.stdout --stderr /tmp/pkb/cmd0f419fc8-ddb3-4f79-97f7-a259688defb1.stderr --delete
