Bad CL?

https://luci-milo.appspot.com/buildbot/chromeos/veyron_speedy-paladin/5235

START	generic_RebootTest	generic_RebootTest	timestamp=1494458687	localtime=May 10 16:24:47	
	FAIL	generic_RebootTest	generic_RebootTest	timestamp=1494459415	localtime=May 10 16:36:55	Unhandled AutoservRebootError: Host did not return from reboot
  Traceback (most recent call last):
    File "/usr/local/autotest/client/common_lib/test.py", line 817, in _call_test_function
      return func(*args, **dargs)
    File "/usr/local/autotest/client/common_lib/test.py", line 470, in execute
      dargs)
    File "/usr/local/autotest/client/common_lib/test.py", line 347, in _call_run_once_with_retry
      postprocess_profiled_run, args, dargs)
    File "/usr/local/autotest/client/common_lib/test.py", line 380, in _call_run_once
      self.run_once(*args, **dargs)
    File "/usr/local/autotest/server/site_tests/generic_RebootTest/generic_RebootTest.py", line 14, in run_once
      host.reboot()
    File "/usr/local/autotest/server/hosts/cros_host.py", line 1426, in reboot
      super(CrosHost, self).reboot(**dargs)
    File "/usr/local/autotest/server/hosts/remote.py", line 164, in reboot
      self.log_op(self.OP_REBOOT, reboot)
    File "/usr/local/autotest/client/common_lib/hosts/base_classes.py", line 544, in log_op
      self.job.run_op(op, op_func, self.get_kernel_ver)
    File "/usr/local/autotest/server/server_job.py", line 938, in run_op
      op_func()
    File "/usr/local/autotest/server/hosts/remote.py", line 160, in reboot
      **dargs)
    File "/usr/local/autotest/server/hosts/remote.py", line 229, in wait_for_restart
      self.log_op(self.OP_REBOOT, op_func)
    File "/usr/local/autotest/client/common_lib/hosts/base_classes.py", line 548, in log_op
      op_func()
    File "/usr/local/autotest/server/hosts/remote.py", line 228, in op_func
      super(RemoteHost, self).wait_for_restart(timeout=timeout, **dargs)
    File "/usr/local/autotest/client/common_lib/hosts/base_classes.py", line 309, in wait_for_restart
      raise error.AutoservRebootError("Host did not return from reboot")
  AutoservRebootError: Host did not return from reboot
END FAIL	generic_RebootTest	generic_RebootTest	timestamp=1494459415	localtime=May 10 16:36:55