memory.desktop.reference failing on chromium.perf/Win 10 High-DPI Perf

Builders failed on: 
- Win 10 High-DPI Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Win%2010%20High-DPI%20Perf


Looks like the bot kinda exploded? See https://chromium-swarm.appspot.com/task?id=36e8d05a784c0d10&refresh=10&show_raw=1

There's this traceback: raceback (most recent call last):
  <module> at c:\b\s\w\ir\tools\perf\run_benchmark:26
    sys.exit(main())
  main at c:\b\s\w\ir\tools\perf\run_benchmark:22
    return benchmark_runner.main(config, [trybot_command.Trybot])
  main at c:\b\s\w\ir\third_party\catapult\telemetry\telemetry\benchmark_runner.py:440
    return command_instance.Run(options)
  Run at c:\b\s\w\ir\third_party\catapult\telemetry\telemetry\benchmark_runner.py:245
    return min(255, self._benchmark().Run(args))
  Run at c:\b\s\w\ir\third_party\catapult\telemetry\telemetry\benchmark.py:94
    return story_runner.RunBenchmark(self, finder_options)
  RunBenchmark at c:\b\s\w\ir\third_party\catapult\telemetry\telemetry\internal\story_runner.py:421
    results.PrintSummary()
  PrintSummary at c:\b\s\w\ir\third_party\catapult\telemetry\telemetry\internal\results\page_test_results.py:366
    output_formatter.Format(self)
  Format at c:\b\s\w\ir\third_party\catapult\telemetry\telemetry\internal\results\json_output_formatter.py:58
    self.output_stream, indent=2)
  dump at c:\b\depot_tools\python276_bin\lib\json\__init__.py:189
    for chunk in iterable:
  _iterencode at c:\b\depot_tools\python276_bin\lib\json\encoder.py:434
    for chunk in _iterencode_dict(o, _current_indent_level):
  _iterencode_dict at c:\b\depot_tools\python276_bin\lib\json\encoder.py:408
    for chunk in chunks:
  _iterencode_list at c:\b\depot_tools\python276_bin\lib\json\encoder.py:332
    for chunk in chunks:
  _iterencode_dict at c:\b\depot_tools\python276_bin\lib\json\encoder.py:390
    yield _encoder(value)
UnicodeDecodeError: 'utf8' codec can't decode byte 0xee in position 5134: invalid continuation byte

Ned, do you have any idea what's going on?