https://wmatrix.googleplex.com/platform/unfiltered?suites=wifi_atten_perf&days_back=30&releases=53&platforms=daisy
https://wmatrix.googleplex.com/platform/unfiltered?suites=wifi_atten_perf&days_back=30&releases=54&platforms=daisy

Sample failures:
07/15 18:59:04.623 WARNI|              test:0606| Autotest caught exception when running test:
Traceback (most recent call last):
  File "/tmp/daisy_8530.0.0_dev_Autotest/chromeos-hwqual-daisy-R53-8530.0.0/autotest/client/common_lib/test.py", line 600, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/tmp/daisy_8530.0.0_dev_Autotest/chromeos-hwqual-daisy-R53-8530.0.0/autotest/client/common_lib/test.py", line 810, in _call_test_function
    raise error.UnhandledTestFail(e)
UnhandledTestFail: Unhandled AttributeError: 'NoneType' object has no attribute 'exit_status'
Traceback (most recent call last):
  File "/tmp/daisy_8530.0.0_dev_Autotest/chromeos-hwqual-daisy-R53-8530.0.0/autotest/client/common_lib/test.py", line 804, in _call_test_function
    return func(*args, **dargs)
  File "/tmp/daisy_8530.0.0_dev_Autotest/chromeos-hwqual-daisy-R53-8530.0.0/autotest/client/common_lib/test.py", line 461, in execute
    dargs)
  File "/tmp/daisy_8530.0.0_dev_Autotest/chromeos-hwqual-daisy-R53-8530.0.0/autotest/client/common_lib/test.py", line 347, in _call_run_once_with_retry
    postprocess_profiled_run, args, dargs)
  File "/tmp/daisy_8530.0.0_dev_Autotest/chromeos-hwqual-daisy-R53-8530.0.0/autotest/client/common_lib/test.py", line 376, in _call_run_once
    self.run_once(*args, **dargs)
  File "/tmp/daisy_8530.0.0_dev_Autotest/chromeos-hwqual-daisy-R53-8530.0.0/autotest/server/site_tests/network_WiFi_AttenuatedPerf/network_WiFi_AttenuatedPerf.py", line 89, in run_once
    results = session.run(config)
  File "/tmp/daisy_8530.0.0_dev_Autotest/chromeos-hwqual-daisy-R53-8530.0.0/autotest/server/cros/network/netperf_session.py", line 112, in run
    result = runner.run(ignore_failures=self._ignore_failures)
  File "/tmp/daisy_8530.0.0_dev_Autotest/chromeos-hwqual-daisy-R53-8530.0.0/autotest/server/cros/network/netperf_runner.py", line 577, in run
    if result.exit_status and not ignore_failures:
AttributeError: 'NoneType' object has no attribute 'exit_status'

07/15 18:59:04.624 INFO |       wifi_client:1302| ======= WiFi autotest complete. Cleaning up... =======

                                   
More results @ 
https://uberchromeos-server38.corp.google.com/new_tko/#tab_id=table_view&columns=test_idx%252Ctest_name%252Cjob_tag%252Chostname%252Cstatus%252CDATE(test_finished_time)%252Creason%252Cplatform&sort=-DATE(test_finished_time)%252Ctest_idx&condition=(((test_name+%253D+%2527network_WiFi_AttenuatedPerf.ht40_ch001%2527)+AND+(%2560status%2560+%253D+%2527FAIL%2527)+AND+(%2560reason%2560%253D%2527Unhandled+AttributeError%253A+%255C%2527NoneType%255C%2527+object+has+no+attribute+%255C%2527exit_status%255C%2527%2527)))&show_invalid=false&parameterized_field_0_type=Test+label&parameterized_field_0_value=invalidated