This will block master-chromium-pfq. I'm trying to reproduce it locally, but feel that I should loop people who may know what's going on as early as possible.

https://pantheon.corp.google.com/storage/browser/chromeos-autotest-results/115679093-chromeos-test/chromeos4-row12-rack9-host15/telemetry_AFDOGenerate/debug/


05/04 00:24:06.520 DEBUG|             utils:0202| Running 'ssh 100.115.219.130 python /home/chromeos-test/images/chell-chrome-pfq/R60-9520.0.0-rc1/telemetry_src/src/tools/perf/run_benchmark --verbose --browser=cros-chrome --output-format=chartjson --output-dir=/home/chromeos-test/images/chell-chrome-pfq/R60-9520.0.0-rc1/telemetry_src/src --remote=chromeos4-row12-rack9-host15 --pageset-repeat=1 page_cycler_v2.typical_25'
05/04 00:40:22.096 DEBUG|  telemetry_runner:0285| Error occurred executing.
05/04 00:40:22.098 DEBUG|  telemetry_runner:0291| Completed with exit code: 47.
stdout:[ RUN      ] http://www.nick.com/games@{'cache_temperature': 'pcv1-cold'}
[ RUN      ] /tmp/tmpD4lgjs.html
[       OK ] /tmp/tmpD4lgjs.html (6420 ms)
[       OK ] http://www.nick.com/games@{'cache_temperature': 'pcv1-cold'} (40897 ms)
[ RUN      ] http://www.nick.com/games@{'cache_temperature': 'pcv1-warm'}
Traceback (most recent call last):
  File "/home/chromeos-test/images/chell-chrome-pfq/R60-9520.0.0-rc1/telemetry_src/src/third_party/catapult/telemetry/telemetry/internal/story_runner.py", line 81, in _RunStoryAndProcessErrorIfNeeded
    state.WillRunStory(story)
  File "/home/chromeos-test/images/chell-chrome-pfq/R60-9520.0.0-rc1/telemetry_src/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 75, in traced_function
    return func(*args, **kwargs)
  File "/home/chromeos-test/images/chell-chrome-pfq/R60-9520.0.0-rc1/telemetry_src/src/third_party/catapult/telemetry/telemetry/page/shared_page_state.py", line 221, in WillRunStory
    self.browser.tabs[-1].Close()
  File "/home/chromeos-test/images/chell-chrome-pfq/R60-9520.0.0-rc1/telemetry_src/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 75, in traced_function
    return func(*args, **kwargs)
  File "/home/chromeos-test/images/chell-chrome-pfq/R60-9520.0.0-rc1/telemetry_src/src/third_party/catapult/telemetry/telemetry/internal/browser/tab.py", line 100, in Close
    self._tab_list_backend.CloseTab(self.id)
  File "/home/chromeos-test/images/chell-chrome-pfq/R60-9520.0.0-rc1/telemetry_src/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/tab_list_backend.py", line 67, in CloseTab
    py_utils.WaitFor(lambda: tab_id not in self.IterContextIds(), timeout=5)
  File "/home/chromeos-test/images/chell-chrome-pfq/R60-9520.0.0-rc1/telemetry_src/src/third_party/catapult/common/py_utils/py_utils/__init__.py", line 132, in WaitFor
    (timeout, GetConditionString()))
TimeoutException: Timed out while waiting 5s for py_utils.WaitFor(lambda: tab_id not in self.IterContextIds(), timeout=5).