Seems like power_LoadTest is failing to finish processing results after collection in my version of platform/crostestutils at the moment (6b10c01 - "check_ethernet: try each recovery method only once").

I've been running it as follows:

cd platform/crostestutils && ./test_that ${IP} power_LoadTest --results_dir ${RESULTS_DIR}.

A stacktrace detailing the problem can be found in results-1-power_LoadTest/power_LoadTest/status:

	START	power_LoadTest	power_LoadTest	timestamp=1518691214	localtime=Feb 15 10:40:14	
		FAIL	power_LoadTest	power_LoadTest	timestamp=1518726066	localtime=Feb 15 20:21:06	Unhandled HTTPError: HTTP Error 500: Internal Server Error
  Traceback (most recent call last):
    File "/usr/local/autotest/common_lib/test.py", line 831, in _call_test_function
      return func(*args, **dargs)
    File "/usr/local/autotest/common_lib/test.py", line 495, in execute
      dargs)
    File "/usr/local/autotest/common_lib/test.py", line 362, in _call_run_once_with_retry
      postprocess_profiled_run, args, dargs)
    File "/usr/local/autotest/common_lib/test.py", line 404, in _call_run_once
      self.postprocess_iteration()
    File "/usr/local/autotest/tests/power_LoadTest/power_LoadTest.py", line 474, in postprocess_iteration
      pdash.upload()
    File "/usr/local/autotest/cros/power/power_dashboard.py", line 114, in upload
      self._upload(powerlog_dict, self._uploadurl)
    File "/usr/local/autotest/cros/power/power_dashboard.py", line 92, in _upload
      urllib2.urlopen(req)
    File "/usr/local/lib/python2.7/urllib2.py", line 154, in urlopen
      return opener.open(url, data, timeout)
    File "/usr/local/lib/python2.7/urllib2.py", line 437, in open
      response = meth(req, response)
    File "/usr/local/lib/python2.7/urllib2.py", line 550, in http_response
      'http', request, response, code, msg, hdrs)
    File "/usr/local/lib/python2.7/urllib2.py", line 475, in error
      return self._call_chain(*args)
    File "/usr/local/lib/python2.7/urllib2.py", line 409, in _call_chain
      result = func(*args)
    File "/usr/local/lib/python2.7/urllib2.py", line 558, in http_error_default
      raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
  HTTPError: HTTP Error 500: Internal Server Error
	END FAIL	power_LoadTest	power_LoadTest	timestamp=1518726066	localtime=Feb 15 20:21:06