autotests on moblab-paladin failed on: 
https://luci-milo.appspot.com/buildbot/chromiumos/moblab-generic-vm-paladin/529

with error:

01:57:59 INFO | autoserv| stderr:
01:57:59 INFO | autoserv| Autotest instance created: localhost
01:57:59 INFO | autoserv| 01-09-2018 [22:42:59] Submitted create_suite_job rpc
01:57:59 INFO | autoserv| 01-09-2018 [22:43:10] Created suite job: localhost/afe/#tab_id=view_job&object_id=1
01:57:59 INFO | autoserv| @@@STEP_LINK@Link to suite@localhost/afe/#tab_id=view_job&object_id=1@@@
01:57:59 INFO | autoserv| The suite job has another 0:43:59.538808 till timeout.
01:57:59 INFO | autoserv| 
01:57:59 INFO | autoserv| 01-09-2018 [23:20:13] printing summary of incomplete jobs (1):
01:57:59 INFO | autoserv| 
01:57:59 INFO | autoserv| dummy_PassServer_nossp: localhost/afe/#tab_id=view_job&object_id=2
01:57:59 INFO | autoserv| The suite job has another 0:13:57.899651 till timeout.
01:57:59 INFO | autoserv| Traceback (most recent call last):
01:57:59 INFO | autoserv| File "/build/moblab-generic-vm/usr/local/build/autotest/client/common_lib/test.py", line 831, in _call_test_function
01:57:59 INFO | autoserv| return func(*args, **dargs)
01:57:59 INFO | autoserv| File "/build/moblab-generic-vm/usr/local/build/autotest/client/common_lib/test.py", line 495, in execute
01:57:59 INFO | autoserv| dargs)
01:57:59 INFO | autoserv| File "/build/moblab-generic-vm/usr/local/build/autotest/client/common_lib/test.py", line 362, in _call_run_once_with_retry
01:57:59 INFO | autoserv| postprocess_profiled_run, args, dargs)
01:57:59 INFO | autoserv| File "/build/moblab-generic-vm/usr/local/build/autotest/client/common_lib/test.py", line 400, in _call_run_once
01:57:59 INFO | autoserv| self.run_once(*args, **dargs)
01:57:59 INFO | autoserv| File "/build/moblab-generic-vm/usr/local/build/autotest/server/site_tests/moblab_RunSuite/moblab_RunSuite.py", line 72, in run_once
01:57:59 INFO | autoserv| result = host.run_as_moblab(cmd, timeout=run_suite_timeout_s)
01:57:59 INFO | autoserv| File "/build/moblab-generic-vm/usr/local/build/autotest/server/hosts/moblab_host.py", line 149, in run_as_moblab
01:57:59 INFO | autoserv| return self.run(command, **kwargs)
01:57:59 INFO | autoserv| File "/build/moblab-generic-vm/usr/local/build/autotest/server/hosts/ssh_host.py", line 323, in run
01:57:59 INFO | autoserv| return self.run_very_slowly(*args, **kwargs)
01:57:59 INFO | autoserv| File "/build/moblab-generic-vm/usr/local/build/autotest/server/hosts/ssh_host.py", line 319, in run_very_slowly
01:57:59 INFO | autoserv| raise error.AutoservRunError(timeout_message, cmderr.args[1])
01:57:59 INFO | autoserv| AutoservRunError: Timeout encountered: /usr/bin/ssh -a -x  -o ControlPath=/tmp/_autotmp_uCfvGRssh-master/socket -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 19252 localhost "export LIBC_FATAL_STDERR_=1; if type \"logger\" > /dev/null 2>&1; then logger -tag \"autotest\" \"server[stack::run_once|run_as_moblab|run] -> ssh_run(su - moblab -c '/usr/local/autotest/site_utils/run_suite.py --pool='' --board=moblab-generic-vm --build=moblab-generic-vm-paladin/R65-10295.0.0-rc2 --suite_name=dummy_server_nossp --retry=True --max_retries=1 --timeout_mins 74')\";fi; su - moblab -c '/usr/local/autotest/site_utils/run_suite.py --pool='' --board=moblab-generic-vm --build=moblab-generic-vm-paladin/R65-10295.0.0-rc2 --suite_name=dummy_server_nossp --retry=True --max_retries=1 --timeout_mins 74'"
01:57:59 INFO | autoserv| * Command:
01:57:59 INFO | autoserv| /usr/bin/ssh -a -x  -o ControlPath=/tmp/_autotmp_uCfvGRssh-master/socket
01:57:59 INFO | autoserv| -o Protocol=2 -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null
01:57:59 INFO | autoserv| -o BatchMode=yes -o ConnectTimeout=30 -o ServerAliveInterval=900 -o
01:57:59 INFO | autoserv| ServerAliveCountMax=3 -o ConnectionAttempts=4 -l root -p 19252 localhost
01:57:59 INFO | autoserv| "export LIBC_FATAL_STDERR_=1; if type \"logger\" > /dev/null 2>&1; then
01:57:59 INFO | autoserv| logger -tag \"autotest\" \"server[stack::run_once|run_as_moblab|run] ->
01:57:59 INFO | autoserv| ssh_run(su - moblab -c '/usr/local/autotest/site_utils/run_suite.py
01:57:59 INFO | autoserv| --pool='' --board=moblab-generic-vm --build=moblab-generic-vm-
01:57:59 INFO | autoserv| paladin/R65-10295.0.0-rc2 --suite_name=dummy_server_nossp --retry=True
01:57:59 INFO | autoserv| --max_retries=1 --timeout_mins 74')\";fi; su - moblab -c
01:57:59 INFO | autoserv| '/usr/local/autotest/site_utils/run_suite.py --pool='' --board=moblab-
01:57:59 INFO | autoserv| generic-vm --build=moblab-generic-vm-paladin/R65-10295.0.0-rc2
01:57:59 INFO | autoserv| --suite_name=dummy_server_nossp --retry=True --max_retries=1
01:57:59 INFO | autoserv| --timeout_mins 74'"
01:57:59 INFO | autoserv| Exit status: 255
01:57:59 INFO | autoserv| Duration: 4480.58103585

There might be a problem with one of these CLs:
crrev.com/c/855580
crrev.com/c/858162
crrev.com/c/857805