Link to build or pfq page.
https://cros-goldeneye.corp.google.com/chromeos/healthmonitoring/buildDetails?buildbucketId=8928038681272661056

https://stainless.corp.google.com/search?exclude_retried=true&first_date=2018-11-06&master_builder_name=&builder_name_number=&shard=&exclude_acts=true&builder_name=&master_builder_name_number=&owner=&retry=&exclude_cts=false&exclude_non_production=false&hostname=&board=&branch=&test=%5Echeets%5C_ContainerMount%24&suite=&build=%5ER73%5C-11343%5C.0%5C.0%24&status=FAIL&status=ERROR&status=ABORT&reason=&waterfall=&exclude_not_run=false&last_date=2018-12-04&exclude_non_release=true&exclude_au=true&model=%5Epantheon%24&view=list


Snippet of log that contains the failure.
...
12/04 14:00:47.206 WARNI|              test:0606| The test failed with the following exception
Traceback (most recent call last):
  File "/usr/local/autotest/common_lib/test.py", line 600, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/usr/local/autotest/common_lib/test.py", line 800, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/common_lib/test.py", line 464, in execute
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/common_lib/test.py", line 371, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/tests/cheets_ContainerMount/cheets_ContainerMount.py", line 140, in run_once
    self._assert_cgroup_mounts(arc_mountinfo_list)
  File "/usr/local/autotest/tests/cheets_ContainerMount/cheets_ContainerMount.py", line 299, in _assert_cgroup_mounts
    '{} setting'.format(setting_file))
  File "/usr/local/autotest/tests/cheets_ContainerMount/cheets_ContainerMount.py", line 67, in _assert_eq
    .format(msg, expected, actual))
TestFail: Unexpected /dev/cpuset/foreground/cpus setting: Expected: 0-7, Actual: 0-3
...



Suspect CL:
https://chrome-internal-review.googlesource.com/c/chromeos/autotest-cheets/+/701711/