failed on 9734.0.0

https://pantheon.corp.google.com/storage/browser/chromeos-autotest-results/128020337-chromeos-test/chromeos4-row8-rack9-host2/debug/

07/11 08:08:58.201 DEBUG|             utils:0212| Running 'mkdir -p /usr/local/autotest/results/default/video_PlaybackPerf/sysinfo/var'
07/11 08:08:58.212 DEBUG|             utils:0212| Running 'rsync --no-perms --chmod=ugo+r -a --exclude=autoserv* --safe-links  /var/log /usr/local/autotest/results/default/video_PlaybackPerf/sysinfo/var'
07/11 08:08:58.303 ERROR|          parallel:0026| child process failed
07/11 08:08:58.313 DEBUG|          parallel:0030| Traceback (most recent call last):
07/11 08:08:58.313 DEBUG|          parallel:0030|   File "/usr/local/autotest/bin/parallel.py", line 18, in fork_start
07/11 08:08:58.314 DEBUG|          parallel:0030|     l()
07/11 08:08:58.314 DEBUG|          parallel:0030|   File "/usr/local/autotest/bin/job.py", line 483, in <lambda>
07/11 08:08:58.314 DEBUG|          parallel:0030|     l = lambda : test.runtest(self, url, tag, args, dargs)
07/11 08:08:58.314 DEBUG|          parallel:0030|   File "/usr/local/autotest/bin/test.py", line 117, in runtest
07/11 08:08:58.314 DEBUG|          parallel:0030|     job.sysinfo.log_after_each_iteration)
07/11 08:08:58.314 DEBUG|          parallel:0030|   File "/usr/local/autotest/common_lib/test.py", line 902, in runtest
07/11 08:08:58.314 DEBUG|          parallel:0030|     mytest._exec(args, dargs)
07/11 08:08:58.315 DEBUG|          parallel:0030|   File "/usr/local/autotest/common_lib/test.py", line 610, in _exec
07/11 08:08:58.315 DEBUG|          parallel:0030|     _call_test_function(self.execute, *p_args, **p_dargs)
07/11 08:08:58.315 DEBUG|          parallel:0030|   File "/usr/local/autotest/common_lib/test.py", line 824, in _call_test_function
07/11 08:08:58.315 DEBUG|          parallel:0030|     raise error.UnhandledTestFail(e)
07/11 08:08:58.315 DEBUG|          parallel:0030| UnhandledTestFail: Unhandled DevToolsClientConnectionError: ''
07/11 08:08:58.315 DEBUG|          parallel:0030| Traceback (most recent call last):
07/11 08:08:58.315 DEBUG|          parallel:0030|   File "/usr/local/autotest/common_lib/test.py", line 818, in _call_test_function
07/11 08:08:58.316 DEBUG|          parallel:0030|     return func(*args, **dargs)
07/11 08:08:58.316 DEBUG|          parallel:0030|   File "/usr/local/autotest/common_lib/test.py", line 471, in execute
07/11 08:08:58.316 DEBUG|          parallel:0030|     dargs)
07/11 08:08:58.316 DEBUG|          parallel:0030|   File "/usr/local/autotest/common_lib/test.py", line 348, in _call_run_once_with_retry
07/11 08:08:58.316 DEBUG|          parallel:0030|     postprocess_profiled_run, args, dargs)
07/11 08:08:58.316 DEBUG|          parallel:0030|   File "/usr/local/autotest/common_lib/test.py", line 381, in _call_run_once
07/11 08:08:58.316 DEBUG|          parallel:0030|     self.run_once(*args, **dargs)
07/11 08:08:58.316 DEBUG|          parallel:0030|   File "/usr/local/autotest/cros/video/helper_logger.py", line 82, in call
07/11 08:08:58.317 DEBUG|          parallel:0030|     return func(*args, **kwargs)
07/11 08:08:58.317 DEBUG|          parallel:0030|   File "/usr/local/autotest/tests/video_PlaybackPerf/video_PlaybackPerf.py", line 124, in run_once
07/11 08:08:58.317 DEBUG|          parallel:0030|     keyvals = self.test_power(local_path)
07/11 08:08:58.317 DEBUG|          parallel:0030|   File "/usr/local/autotest/tests/video_PlaybackPerf/video_PlaybackPerf.py", line 228, in test_power
07/11 08:08:58.317 DEBUG|          parallel:0030|     return self.test_playback(local_path, get_power)
07/11 08:08:58.317 DEBUG|          parallel:0030|   File "/usr/local/autotest/tests/video_PlaybackPerf/video_PlaybackPerf.py", line 275, in test_playback
07/11 08:08:58.317 DEBUG|          parallel:0030|     constants.MEDIA_GVD_BUCKET):
07/11 08:08:58.317 DEBUG|          parallel:0030|   File "/usr/local/autotest/cros/video/histogram_verifier.py", line 65, in is_bucket_present
07/11 08:08:58.318 DEBUG|          parallel:0030|     verify(cr,histogram_name, histogram_bucket_value)
07/11 08:08:58.318 DEBUG|          parallel:0030|   File "/usr/local/autotest/cros/video/histogram_verifier.py", line 45, in verify
07/11 08:08:58.318 DEBUG|          parallel:0030|     tab = cr.browser.tabs.New()
07/11 08:08:58.318 DEBUG|          parallel:0030|   File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/browser/tab_list.py", line 9, in New
07/11 08:08:58.318 DEBUG|          parallel:0030|     return self._tab_list_backend.New(timeout)
07/11 08:08:58.318 DEBUG|          parallel:0030|   File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/tab_list_backend.py", line 35, in New
07/11 08:08:58.318 DEBUG|          parallel:0030|     response = self._browser_backend.devtools_client.RequestNewTab(timeout)
07/11 08:08:58.319 DEBUG|          parallel:0030|   File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/devtools_client_backend.py", line 250, in RequestNewTab
07/11 08:08:58.319 DEBUG|          parallel:0030|     return self._devtools_http.Request('new', timeout=timeout)
07/11 08:08:58.319 DEBUG|          parallel:0030|   File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/devtools_http.py", line 88, in Request
07/11 08:08:58.319 DEBUG|          parallel:0030|     response = self._conn.getresponse()
07/11 08:08:58.319 DEBUG|          parallel:0030|   File "/usr/local/lib64/python2.7/httplib.py", line 1132, in getresponse
07/11 08:08:58.319 DEBUG|          parallel:0030|     response.begin()
07/11 08:08:58.319 DEBUG|          parallel:0030|   File "/usr/local/lib64/python2.7/httplib.py", line 453, in begin
07/11 08:08:58.320 DEBUG|          parallel:0030|     version, status, reason = self._read_status()
07/11 08:08:58.320 DEBUG|          parallel:0030|   File "/usr/local/lib64/python2.7/httplib.py", line 417, in _read_status
07/11 08:08:58.320 DEBUG|          parallel:0030|     raise BadStatusLine(line)
07/11 08:08:58.320 DEBUG|          parallel:0030| DevToolsClientConnectionError: ''
07/11 08:08:58.321 DEBUG|          parallel:0030| 


This also failed on lars 9734.0.0
https://pantheon.corp.google.com/storage/browser/chromeos-autotest-results/128010775-chromeos-test/chromeos4-row11-rack7-host22/debug/