With 'mach android-emulator --version 7.0', I find all tests fail on devicemanager's getInfo(). Apparently it fails to retrieve /proc/meminfo. https://treeherder.mozilla.org/logviewer.html#?job_id=151512739&repo=try&lineNumber=1761 [task 2017-12-13T20:41:26.819Z] 20:41:26 INFO - Device info: [task 2017-12-13T20:41:28.117Z] 20:41:28 INFO - Traceback (most recent call last): [task 2017-12-13T20:41:28.117Z] 20:41:28 INFO - File "/builds/worker/workspace/build/tests/mochitest/runtestsremote.py", line 400, in <module> [task 2017-12-13T20:41:28.117Z] 20:41:28 INFO - sys.exit(main()) [task 2017-12-13T20:41:28.117Z] 20:41:28 INFO - File "/builds/worker/workspace/build/tests/mochitest/runtestsremote.py", line 396, in main [task 2017-12-13T20:41:28.118Z] 20:41:28 INFO - return run_test_harness(parser, options) [task 2017-12-13T20:41:28.118Z] 20:41:28 INFO - File "/builds/worker/workspace/build/tests/mochitest/runtestsremote.py", line 348, in run_test_harness [task 2017-12-13T20:41:28.118Z] 20:41:28 INFO - mochitest.printDeviceInfo() [task 2017-12-13T20:41:28.119Z] 20:41:28 INFO - File "/builds/worker/workspace/build/tests/mochitest/runtestsremote.py", line 254, in printDeviceInfo [task 2017-12-13T20:41:28.119Z] 20:41:28 INFO - devinfo = self._dm.getInfo() [task 2017-12-13T20:41:28.119Z] 20:41:28 INFO - File "/builds/worker/workspace/build/venv/lib/python2.7/site-packages/mozdevice/devicemanagerADB.py", line 650, in getInfo [task 2017-12-13T20:41:28.119Z] 20:41:28 INFO - ret["memtotal"] = meminfo["MemTotal"] [task 2017-12-13T20:41:28.119Z] 20:41:28 INFO - KeyError: 'MemTotal' [task 2017-12-13T20:41:28.130Z] 20:41:28 ERROR - Return code: 1 [task 2017-12-13T20:41:28.130Z] 20:41:28 ERROR - No tests run or test summary not found

In local testing, I see: gbrown@mozpad:~/src$ adb shell cat /proc/meminfo MemTotal: 2059124 kB MemFree: 1255312 kB Buffers: 6884 kB Cached: 520924 kB SwapCached: 0 kB Active: 303616 kB Inactive: 440684 kB Active(anon): 222952 kB Inactive(anon): 1128 kB Active(file): 80664 kB Inactive(file): 439556 kB Unevictable: 256 kB Mlocked: 256 kB SwapTotal: 0 kB SwapFree: 0 kB Dirty: 0 kB Writeback: 0 kB AnonPages: 216788 kB Mapped: 244204 kB Shmem: 7604 kB Slab: 24604 kB SReclaimable: 9956 kB SUnreclaim: 14648 kB KernelStack: 7696 kB PageTables: 11280 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 1029560 kB Committed_AS: 17600724 kB VmallocTotal: 251658176 kB VmallocUsed: 36340 kB VmallocChunk: 251611588 kB gbrown@mozpad:~/src$ adb pull /proc/meminfo xx adb: error: remote object '/proc/meminfo' does not exist

The core of this fix is switching from 'adb pull /proc/meminfo' to 'adb shell cat /proc/meminfo' to retrieve memory data. I've also tried to make this more tolerant to unexpected data formats (if MemTotal is not found or some line in meminfo is not in an expected format, I'd prefer to simply not return any memory info, rather than raising an error and breaking tests). https://treeherder.mozilla.org/#/jobs?repo=try&revision=09971cba1f0f723198f66f59242358210c248239

Comment on attachment 8936727 [details] [diff] [review] use 'cat /proc/meminfo' Review of attachment 8936727 [details] [diff] [review]: ----------------------------------------------------------------- lgtm. r+

Pushed by gbrown@mozilla.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/41d8dd58a696 Use cat /proc/meminfo rather than trying to pull it from device; r=bc