Bug 179700 – [ios-simulator] LayoutTest step intermittently times out before launching iPad simulators

• Status: NEW
• Component: Tools / Tests

[Ryan Haddad]

It appears that the LayoutTest step for iOS Simulator bots intermittently times out with no output at the point that it would be killing iPhone simulators to launch iPad simulators. A subsequent test run on the same bot will usually work without issue.

Example failure:
https://build.webkit.org/builders/Apple%20iOS%2011%20Simulator%20Release%20WK2%20%28Tests%29/builds/1280

Successful run on same bot:
https://build.webkit.org/builders/Apple%20iOS%2011%20Simulator%20Release%20WK2%20%28Tests%29/builds/1282

[Radar WebKit Bug Importer]

<rdar://problem/35545098>

[Jonathan Bedard]

In order to debug this, we will need <https://bugs.webkit.org/show_bug.cgi?id=176393>.

I also have a suspicion that this is related to the proposed fix <https://bugs.webkit.org/show_bug.cgi?id=178368>.  This is one of the only places in webkitpy where we are waiting for something without a timeout.

[Ryan Haddad]

The following webkitpy tests also fails on runs that exhibit this behavior:

[379/1691] webkitpy.layout_tests.controllers.layout_test_runner_unittest.LayoutTestRunnerTests.test_servers_started failed:
  Traceback (most recent call last):
    File "/Volumes/Data/slave/ios-simulator-11-release-tests-wk2/build/Tools/Scripts/webkitpy/layout_tests/controllers/layout_test_runner_unittest.py", line 178, in test_servers_started
      self.assertEqual(self.http_started, True)
  AssertionError: False != True
  

New link since the original ones have expired: https://build.webkit.org/builders/Apple%20iOS%2011%20Simulator%20Release%20WK2%20%28Tests%29/builds/2308

[Jonathan Bedard]

We might be able to fix this by booting less iPad/iPhone 7 simulators.