Here's one example, but I think I've seen more.

https://luci-milo.appspot.com/buildbot/chromeos/cyan-paladin/2516


05/11 18:59:48.022 DEBUG|        dev_server:1828| Current CrOS auto-update status: pre-setup rootfs update
05/11 18:59:58.072 DEBUG|             utils:0202| Running 'ssh 100.115.219.136 'curl "http://100.115.219.136:8082/get_au_status?build_name=cyan-paladin/R60-9542.0.0-rc4&force_update=True&pid=8724&host_name=chromeos4-row6-rack9-host2&full_update=False"''
05/11 18:59:59.128 DEBUG|        dev_server:1893| Failed to trigger auto-update process on devserver
05/11 18:59:59.131 DEBUG|             utils:0202| Running 'ssh 100.115.219.136 'curl "http://100.115.219.136:8082/handler_cleanup?pid=8724&host_name=chromeos4-row6-rack9-host2"''
05/11 19:00:00.187 DEBUG|             utils:0202| Running 'ssh 100.115.219.136 'curl "http://100.115.219.136:8082/collect_cros_au_log?pid=8724&host_name=chromeos4-row6-rack9-host2"''
05/11 19:00:01.262 DEBUG|        dev_server:1721| Saving auto-update logs into /usr/local/autotest/results/hosts/chromeos4-row6-rack9-host2/201118-provision/20171105184549/autoupdate_logs/CrOS_update_chromeos4-row6-rack9-host2_8724.log
05/11 19:00:01.265 DEBUG|             utils:0202| Running 'ssh 100.115.219.136 'curl "http://100.115.219.136:8082/kill_au_proc?pid=8724&host_name=chromeos4-row6-rack9-host2"''
05/11 19:00:02.247 DEBUG|        dev_server:2079| Exception raised on auto_update attempt #1:
 Traceback (most recent call last):
  File "/home/chromeos-test/chromiumos/src/platform/dev/cros_update.py", line 251, in TriggerAU
    self._WriteAUStatus(cros_update_progress.FINISHED)
  File "/home/chromeos-test/chromiumos/chromite/lib/remote_access.py", line 562, in __exit__
    self.device.Cleanup()
  File "/home/chromeos-test/chromiumos/chromite/lib/remote_access.py", line 685, in Cleanup
    self.BaseRunCommand(cmd, **kwargs)
  File "/home/chromeos-test/chromiumos/chromite/lib/remote_access.py", line 871, in BaseRunCommand
    return self.GetAgent().RemoteSh(cmd, **kwargs)
  File "/home/chromeos-test/chromiumos/chromite/lib/remote_access.py", line 343, in RemoteSh
    raise SSHConnectionError(e.result.error)
SSHConnectionError: ssh: connect to host chromeos4-row6-rack9-host2 port 22: Connection timed out
05/11 19:00:02.249 DEBUG|        dev_server:2085| Please see error details in log /usr/local/autotest/results/hosts/chromeos4-row6-rack9-host2/201118-provision/20171105184549/autoupdate_logs/CrOS_update_chromeos4-row6-rack9-host2_8724.log