Where the issue happened:
Canary veyron_minnie-release

What the issue was:
Canary veyron_minnie-release failed at autoupdate_EndToEndTest.paygen_au_canary_full where update_stateful(https://cs.corp.google.com/chromeos_public/src/third_party/autotest/files/client/common_lib/cros/autoupdater.py?rcl=745b8167a5a346742905c7b4d8b74ec722d56314&l=516) failed. The DUT was no longer pingable after the failure of udpate_stateful() .

When the issue started:
This failure has been there since build #1184 (see https://chromegw.corp.google.com/i/chromeos/builders/veyron_minnie-release).

Error messages from https://pantheon.corp.google.com/storage/browser/chromeos-autotest-results/121595781-chromeos-test/chromeos4-row9-rack9-host3/autoupdate_EndToEndTest.paygen_au_canary_full/debug/:
06/05 07:47:32.358 DEBUG|      abstract_ssh:0390| Trying scp.
06/05 07:47:32.359 DEBUG|          ssh_host:0284| Running (ssh) 'ls "/tmp/sysinfo/autoserv-idJ0Y7/results/default/"*'
06/05 07:47:32.836 DEBUG|             utils:0298| [stderr] ls: cannot access /tmp/sysinfo/autoserv-idJ0Y7/results/default/*: No such file or directory
06/05 07:47:32.839 DEBUG|          ssh_host:0284| Running (ssh) 'ls "/tmp/sysinfo/autoserv-idJ0Y7/results/default/".[!.]*'
06/05 07:47:33.296 DEBUG|             utils:0298| [stderr] ls: cannot access /tmp/sysinfo/autoserv-idJ0Y7/results/default/.[!.]*: No such file or directory
06/05 07:47:33.300 DEBUG|        server_job:1372| Client state file /usr/local/autotest/results/121595781-chromeos-test/chromeos4-row9-rack9-host3/control.autoserv.state not found
06/05 07:47:33.304 DEBUG|          base_job:0399| Persistent state client.* deleted
06/05 07:47:33.305 DEBUG|          autotest:0966| Autotest job finishes.
06/05 07:47:33.306 ERROR|               log:0027| post-test iteration server sysinfo error:
06/05 07:47:33.307 ERROR|         traceback:0013| Traceback (most recent call last):
06/05 07:47:33.307 ERROR|         traceback:0013|   File "/usr/local/autotest/client/common_lib/log.py", line 25, in decorated_func
06/05 07:47:33.308 ERROR|         traceback:0013|     fn(*args, **dargs)
06/05 07:47:33.309 ERROR|         traceback:0013|   File "/usr/local/autotest/server/test.py", line 71, in wrapper
06/05 07:47:33.309 ERROR|         traceback:0013|     func(self, mytest, host, at, outputdir)
06/05 07:47:33.310 ERROR|         traceback:0013|   File "/usr/local/autotest/server/test.py", line 216, in after_iteration_hook
06/05 07:47:33.311 ERROR|         traceback:0013|     results_dir=self.job.resultdir)
06/05 07:47:33.312 ERROR|         traceback:0013|   File "/usr/local/autotest/server/autotest.py", line 381, in run
06/05 07:47:33.312 ERROR|         traceback:0013|     client_disconnect_timeout, use_packaging=use_packaging)
06/05 07:47:33.313 ERROR|         traceback:0013|   File "/usr/local/autotest/server/autotest.py", line 464, in _do_run
06/05 07:47:33.314 ERROR|         traceback:0013|     client_disconnect_timeout=client_disconnect_timeout)
06/05 07:47:33.315 ERROR|         traceback:0013|   File "/usr/local/autotest/server/autotest.py", line 950, in execute_control
06/05 07:47:33.315 ERROR|         traceback:0013|     raise error.AutotestRunError(msg)
06/05 07:47:33.316 ERROR|         traceback:0013| AutotestRunError: Aborting - unexpected final status message from client on chromeos4-row9-rack9-host3
06/05 07:47:33.317 ERROR|         traceback:0013| 
06/05 07:47:33.317 DEBUG|              test:0396| after_iteration_hooks completed
06/05 07:47:33.318 WARNI|              test:0616| The test failed with the following exception
Traceback (most recent call last):
  File "/usr/local/autotest/client/common_lib/test.py", line 610, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 818, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 471, in execute
    dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 348, in _call_run_once_with_retry
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 381, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/server/site_tests/autoupdate_EndToEndTest/autoupdate_EndToEndTest.py", line 1818, in run_once
    test_platform.prep_device_for_update(test_conf['source_release'])
  File "/usr/local/autotest/server/site_tests/autoupdate_EndToEndTest/autoupdate_EndToEndTest.py", line 1151, in prep_device_for_update
    self._staged_urls.source_stateful_url)
  File "/usr/local/autotest/server/site_tests/autoupdate_EndToEndTest/autoupdate_EndToEndTest.py", line 985, in _install_source_version
    stateful_url, True)
  File "/usr/local/autotest/server/site_tests/autoupdate_EndToEndTest/autoupdate_EndToEndTest.py", line 942, in _update_via_test_payloads
    perform_update(stateful_url, True)
  File "/usr/local/autotest/server/site_tests/autoupdate_EndToEndTest/autoupdate_EndToEndTest.py", line 923, in perform_update
    updater.update_stateful(clobber=clobber)
  File "/usr/local/autotest/client/common_lib/cros/autoupdater.py", line 538, in update_stateful
    raise update_error
StatefulUpdateError: Failed to perform stateful update on chromeos4-row9-rack9-host3