+++ This bug was initially created as a clone of Bug #809753 +++ https://treeherder.mozilla.org/logviewer.html#?job_id=2434097&repo=autoland 07:22:17 INFO - REFTEST TEST-START | http://10.0.2.2:8854/tests/layout/reftests/bugs/218473-1.html == http://10.0.2.2:8854/tests/layout/reftests/bugs/218473-1-ref.html 07:22:17 INFO - REFTEST TEST-LOAD | http://10.0.2.2:8854/tests/layout/reftests/bugs/218473-1.html | 382 / 818 (46%) 07:22:17 INFO - REFTEST TEST-LOAD | http://10.0.2.2:8854/tests/layout/reftests/bugs/218473-1-ref.html | 382 / 818 (46%) 07:22:27 INFO - INFO | automation.py | Application ran for: 0:20:36.667922 07:22:27 INFO - INFO | zombiecheck | Reading PID log: /tmp/tmppjauLApidlog 07:22:27 INFO - /data/anr/traces.txt not found 07:22:27 INFO - WARNING: Unable to retrieve log file (/storage/sdcard/tests/reftest/reftest.log) from remote device 07:22:27 INFO - Automation Error: Exception caught while running tests 07:22:27 INFO - Traceback (most recent call last): 07:22:27 INFO - File "/home/worker/workspace/build/tests/reftest/remotereftest.py", line 422, in runTests 07:22:27 INFO - retVal = reftest.runTests(options.tests, options) 07:22:27 INFO - File "/home/worker/workspace/build/tests/reftest/runreftest.py", line 426, in runTests 07:22:27 INFO - return self.runSerialTests(manifests, options, cmdargs) 07:22:27 INFO - File "/home/worker/workspace/build/tests/reftest/runreftest.py", line 681, in runSerialTests 07:22:27 INFO - debuggerInfo=debuggerInfo) 07:22:27 INFO - File "/home/worker/workspace/build/tests/reftest/remotereftest.py", line 336, in runApp 07:22:27 INFO - timeout=timeout) 07:22:27 INFO - File "/home/worker/workspace/build/tests/reftest/automation.py", line 577, in runApp 07:22:27 INFO - crashed = self.checkForCrashes(os.path.join(profileDir, "minidumps"), symbolsPath) 07:22:27 INFO - File "/home/worker/workspace/build/tests/reftest/remoteautomation.py", line 212, in checkForCrashes 07:22:27 INFO - logcat = self._devicemanager.getLogcat(filterOutRegexps=fennecLogcatFilters) 07:22:27 INFO - File "/home/worker/workspace/build/venv/local/lib/python2.7/site-packages/mozdevice/devicemanager.py", line 166, in getLogcat 07:22:27 INFO - timeout=self.short_timeout) 07:22:27 INFO - File "/home/worker/workspace/build/venv/local/lib/python2.7/site-packages/mozdevice/devicemanager.py", line 405, in shellCheckOutput 07:22:27 INFO - raise DMError("Non-zero return code for command: %s (output: '%s', retval: '%s')" % (cmd, output, retval)) 07:22:27 INFO - DMError: Non-zero return code for command: ['/system/bin/logcat', '-v', 'time', '-d', 'dalvikvm:I', 'ConnectivityService:S', 'WifiMonitor:S', 'WifiStateTracker:S', 'wpa_supplicant:S', 'NetworkStateTracker:S'] (output: '', retval: 'None') 07:24:34 INFO - WARNING: Error getting device information

Emulator became unresponsive, the test harness noticed because logcat failed, harness threw DMError. This has always happened for Android emulator tests. It can happen during any test. On buildbot, the "DMError" triggers an automatic retry; for taskcluster, a solution is being developed in bug 1280570.