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Status: Assigned
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EstimatedDays: ----
NextAction: ----
OS: Chrome
Pri: 2
Type: Bug

Blocking:
issue 816655



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[CrOS Cellular Test Lab] Investigate cellular autotest failures

Project Member Reported by harpreet@chromium.org, Jul 11

Issue description

Most cellular automated tests are failing across devices. This is a tracking bug to investigate failure/issues and getting all cellular test suites running and passing.


https://stainless.corp.google.com/search?exclude_retried=true&exclude_cts=true&exclude_non_production=false&exclude_acts=true&exclude_non_release=true&exclude_au=true&suite=%5Ecellular%5C_endtoend%24%7Ccellular_ota_att%7Ccellular_ota_tmobile%7Ccellular_ota_verizon%7Ccellular_ota&exclude_not_run=false&row=hostname&col=build&view=matrix&days=21


dsunkara@ to own this to do some initial investigation and I can certainly help where needed.
 
Blocking: 816655
chromeos1-row2-rack7-host1 (Lucas-Daisy) has issues. Cellular connection is active. But the tests fail with below reasons:

1. network_ChromeCellularEndToEnd client test did not pass (reason: Cellular is not available to determine network preference.).
2. network_ChromeCellularEndToEnd client test did not pass (reason: Unhandled KeyError: u'Cannot find a context with id=E23AEB12FAF1888844EA4E9907B4B1FF').
3. network_ChromeCellularEndToEnd client test did not pass (reason: Cellular was not enabled.).
4. INIT_ERROR: Cannot find cellular device in shill. Is the modem plugged in?
5. Unhandled DBusException: org.chromium.flimflam.Error.InProgress: Enable operation already in progress

https://stainless.corp.google.com/search?view=list&first_date=2018-07-10&last_date=2018-07-16&hostname=chromeos1-row2-rack7-host1&status=FAIL&status=ERROR&status=ABORT&exclude_cts=true&exclude_not_run=false&exclude_non_release=true&exclude_au=true&exclude_acts=true&exclude_retried=true&exclude_non_production=false

In most of the cases, cellular modem is not up while running the tests or it took time to bring up the modem which resulted in test failures. 

Recently, I have also noticed issues where ModemManager fails to start or takes sometime to start.
Issue also reported @ https://bugs.chromium.org/p/chromium/issues/detail?id=853158

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