https://uberchromegw.corp.google.com/i/chromeos/builders/x86-alex-paladin/builds/24849

06/22 21:26:01.295 DEBUG|          ssh_host:0180| Running (ssh) 'start update-engine'
06/22 21:26:01.676 DEBUG|        base_utils:0278| [stdout] update-engine start/running, process 4892
06/22 21:26:01.682 DEBUG|          ssh_host:0180| Running (ssh) '/usr/bin/update_engine_client -status 2>&1 | grep CURRENT_OP'
06/22 21:26:01.992 WARNI|         cros_host:0755| Autoupdate did not complete.
06/22 21:26:01.999 WARNI|              test:0606| Autotest caught exception when running test:
Traceback (most recent call last):
  File "/usr/local/autotest/client/common_lib/test.py", line 600, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 810, in _call_test_function
    raise error.UnhandledTestFail(e)
UnhandledTestFail: Unhandled AutoservRunError: command execution error
* Command: 
    /usr/bin/ssh -a -x    -o ControlPath=/tmp/_autotmp_EpBTRossh-
    master/socket -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null
    -o BatchMode=yes -o ConnectTimeout=30 -o ServerAliveInterval=900 -o
    ServerAliveCountMax=3 -o ConnectionAttempts=4 -o Protocol=2 -l root -p 22
    chromeos2-row1-rack7-host7 "export LIBC_FATAL_STDERR_=1; if type
    \"logger\" > /dev/null 2>&1; then logger -tag \"autotest\"
    \"server[stack::run_update|reset_update_engine|check_update_status] ->
    ssh_run(/usr/bin/update_engine_client -status 2>&1 | grep
    CURRENT_OP)\";fi; /usr/bin/update_engine_client -status 2>&1 | grep
    CURRENT_OP"
Exit status: 1
Duration: 0.251242160797


How do we debug this?