https://stainless.corp.google.com/search?view=list&first_date=2018-09-01&last_date=2018-09-06&test=%5Enetwork_WiFi_SimpleConnect%5C.wifi_check1x_WEP%24&board=grunt%7Cscarlet&status=GOOD&status=FAIL&status=ERROR&status=ABORT&reason=Lost+ping+packets%3A+PingResult&exclude_cts=true&exclude_not_run=false&exclude_non_release=true&exclude_au=true&exclude_acts=true&exclude_retried=true&exclude_non_production=true


09/06 10:08:47.815 INFO |wifi_test_context_:0281| Connected successfully to SimpleConnect_a_ag0a0_ch1, signal level: -8.
09/06 10:08:47.829 DEBUG|          ssh_host:0301| Running (ssh) 'mkdir -p /tmp' from 'assert_disconnect_count|get_event_logger|__init__|get_tmp_dir|run|run_very_slowly'
09/06 10:08:48.299 DEBUG|          ssh_host:0301| Running (ssh) 'mktemp -d /tmp/autoserv-XXXXXX' from 'assert_disconnect_count|get_event_logger|__init__|get_tmp_dir|run|run_very_slowly'
09/06 10:08:48.650 DEBUG|             utils:0287| [stdout] /tmp/autoserv-V5xC7T
09/06 10:08:48.703 DEBUG|          ssh_host:0301| Running (ssh) 'nohup /usr/sbin/iw event -t </dev/null >/tmp/autoserv-V5xC7T/iw_event.log 2>&1 & echo $!;date +%s' from 'run_once|__enter__|assert_disconnect_count|start|run|run_very_slowly'
09/06 10:08:49.122 DEBUG|             utils:0287| [stdout] 24019
09/06 10:08:49.179 DEBUG|             utils:0287| [stdout] 1536253729
09/06 10:08:49.181 INFO | site_linux_system:0729| Pinging from the client.
09/06 10:08:49.195 DEBUG|          ssh_host:0301| Running (ssh) 'ping -c 10 192.168.0.254' from 'run_once|assert_ping_from_dut|ping|ping|run|run_very_slowly'
09/06 10:08:49.636 DEBUG|             utils:0287| [stdout] PING 192.168.0.254 (192.168.0.254) 56(84) bytes of data.
09/06 10:08:49.637 DEBUG|             utils:0287| [stdout] 64 bytes from 192.168.0.254: icmp_seq=1 ttl=64 time=3.25 ms
09/06 10:08:50.632 DEBUG|             utils:0287| [stdout] 64 bytes from 192.168.0.254: icmp_seq=2 ttl=64 time=0.982 ms
09/06 10:08:51.634 DEBUG|             utils:0287| [stdout] 64 bytes from 192.168.0.254: icmp_seq=3 ttl=64 time=0.938 ms
09/06 10:08:59.635 DEBUG|             utils:0287| [stdout] 
09/06 10:08:59.635 DEBUG|             utils:0287| [stdout] --- 192.168.0.254 ping statistics ---
09/06 10:08:59.635 DEBUG|             utils:0287| [stdout] 10 packets transmitted, 3 received, 70% packet loss, time 9004ms
09/06 10:08:59.635 DEBUG|             utils:0287| [stdout] rtt min/avg/max/mdev = 0.938/1.724/3.253/1.081 ms
09/06 10:08:59.651 DEBUG|          ssh_host:0301| Running (ssh) 'kill 24019' from '__exit__|assert_disconnect_count|__exit__|stop|run|run_very_slowly'
09/06 10:09:00.085 DEBUG|      abstract_ssh:0413| get_file. source: /tmp/autoserv-V5xC7T/iw_event.log, dest: ./debug/iw_event_0.log, delete_dest: False,preserve_perm: True, preserve_symlinks:False
09/06 10:09:00.097 DEBUG|          ssh_host:0301| Running (ssh) 'rsync --version' from 'stop|get_file|use_rsync|check_rsync|run|run_very_slowly'
09/06 10:09:00.583 DEBUG|      abstract_ssh:0425| Using Rsync.
09/06 10:09:00.584 DEBUG|             utils:0219| Running 'rsync -L  --timeout=1800 --rsh='/usr/bin/ssh -a -x  -o Protocol=2 -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o BatchMode=yes -o ConnectTimeout=30 -o ServerAliveInterval=900 -o ServerAliveCountMax=3 -o ConnectionAttempts=4 -l root -p 22' -az --no-o --no-g  root@chromeos15-row4-rack12-host7:"/tmp/autoserv-V5xC7T/iw_event.log" "/usr/local/autotest/results/lxc_job_folder/network_WiFi_SimpleConnect.wifi_check1x_WEP/debug/iw_event_0.log"'
09/06 10:09:01.053 INFO |   iw_event_logger:0088| iw event log saved to ./debug/iw_event_0.log
09/06 10:09:01.053 DEBUG|              test:0410| Test failed due to Lost ping packets: PingResult(received=3, max_latency=3.253, loss=70, 


sample traceback 

Traceback (most recent call last):
  File "/usr/local/autotest/client/common_lib/test.py", line 631, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 831, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 495, in execute
    dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 362, in _call_run_once_with_retry
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 400, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/server/site_tests/network_WiFi_SimpleConnect/network_WiFi_SimpleConnect.py", line 39, in run_once
    self.context.assert_ping_from_dut()
  File "/usr/local/autotest/server/cros/network/wifi_test_context_manager.py", line 303, in assert_ping_from_dut
    self.client.ping(ping_config)
  File "/usr/local/autotest/server/site_linux_system.py", line 730, in ping
    return self._ping_runner.ping(ping_config)
  File "/usr/local/autotest/client/common_lib/cros/network/ping_runner.py", line 367, in ping
    raise error.TestFail('Lost ping packets: %r.' % ping_result)