peppy-chrome-pfq bot has been failing for several builds for dummy_PassServer.sanity_SERVER_JOB

https://uberchromegw.corp.google.com/i/chromeos/builders/peppy-chrome-pfq/builds/3434

The log shows the following error:
05/01 04:36:27.131 ERROR|              base:0073| No handlers could be found for logger "elasticsearch.trace"
05/01 04:36:27.658 ERROR|         traceback:0013| Traceback (most recent call last):
05/01 04:36:27.659 ERROR|         traceback:0013|   File "/usr/local/autotest/server/autoserv", line 530, in run_autoserv
05/01 04:36:27.659 ERROR|         traceback:0013|     machines)
05/01 04:36:27.660 ERROR|         traceback:0013|   File "/usr/local/autotest/server/autoserv", line 163, in _run_with_ssp
05/01 04:36:27.660 ERROR|         traceback:0013|     dut_name=dut_name)
05/01 04:36:27.660 ERROR|         traceback:0013|   File "/usr/local/autotest/site-packages/chromite/lib/metrics.py", line 274, in wrapper
05/01 04:36:27.660 ERROR|         traceback:0013|     return fn(*args, **kwargs)
05/01 04:36:27.661 ERROR|         traceback:0013|   File "/usr/local/autotest/site_utils/lxc.py", line 240, in func_cleanup_if_fail
05/01 04:36:27.661 ERROR|         traceback:0013|     return func(*args, **kwargs)
05/01 04:36:27.661 ERROR|         traceback:0013|   File "/usr/local/autotest/site_utils/lxc.py", line 932, in setup_test
05/01 04:36:27.661 ERROR|         traceback:0013|     container = self.create_from_base(name)
05/01 04:36:27.662 ERROR|         traceback:0013|   File "/usr/local/autotest/site-packages/chromite/lib/metrics.py", line 274, in wrapper
05/01 04:36:27.662 ERROR|         traceback:0013|     return fn(*args, **kwargs)
05/01 04:36:27.662 ERROR|         traceback:0013|   File "/usr/local/autotest/site_utils/lxc.py", line 811, in create_from_base
05/01 04:36:27.662 ERROR|         traceback:0013|     name, disable_snapshot_clone=True, force_cleanup=True)
05/01 04:36:27.662 ERROR|         traceback:0013|   File "/usr/local/autotest/site-packages/chromite/lib/metrics.py", line 274, in wrapper
05/01 04:36:27.662 ERROR|         traceback:0013|     return fn(*args, **kwargs)
05/01 04:36:27.663 ERROR|         traceback:0013|   File "/usr/local/autotest/site_utils/lxc.py", line 801, in create_from_base
05/01 04:36:27.663 ERROR|         traceback:0013|     utils.run(cmd)
05/01 04:36:27.663 ERROR|         traceback:0013|   File "/usr/local/autotest/client/common_lib/utils.py", line 757, in run
05/01 04:36:27.664 ERROR|         traceback:0013|     "Command returned non-zero exit status")
05/01 04:36:27.664 ERROR|         traceback:0013| CmdError: Command <sudo lxc-clone -p /usr/local/autotest/containers -P /usr/local/autotest/containers base_06 test_115077434_1493638583_26512  > failed, rc=1, Command returned non-zero exit status
05/01 04:36:27.664 ERROR|         traceback:0013| * Command: 
05/01 04:36:27.664 ERROR|         traceback:0013|     sudo lxc-clone -p /usr/local/autotest/containers -P
05/01 04:36:27.665 ERROR|         traceback:0013|     /usr/local/autotest/containers base_06 test_115077434_1493638583_26512
05/01 04:36:27.665 ERROR|         traceback:0013| Exit status: 1
05/01 04:36:27.665 ERROR|         traceback:0013| Duration: 0.231851816177
05/01 04:36:27.665 ERROR|         traceback:0013| 
05/01 04:36:27.665 ERROR|         traceback:0013| stderr:
05/01 04:36:27.665 ERROR|         traceback:0013| lxc-clone is deprecated in favor of lxc-copy.
05/01 04:36:27.666 ERROR|         traceback:0013| 
05/01 04:36:27.666 ERROR|         traceback:0013| Error: container base_06 is not defined
05/01 04:36:28.028 ERROR|          autoserv:0765| 1
Traceback (most recent call last):
  File "/usr/local/autotest/server/autoserv", line 761, in main
    use_ssp)
  File "/usr/local/autotest/server/autoserv", line 574, in run_autoserv
    sys.exit(exit_code)
SystemExit: 1

xixuan@ do you know about this code?