Bug 168937 – LayoutTest tiled-drawing/scrolling/fast-scroll-iframe-latched-mainframe.html is a flaky failure

• Component: New Bugs
• Status: NEW

[Ryan Haddad]

LayoutTest tiled-drawing/scrolling/fast-scroll-iframe-latched-mainframe.html is a flaky failure

https://build.webkit.org/results/Apple%20Sierra%20Release%20WK2%20(Tests)/r213086%20(3926)/results.html

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=tiled-drawing%2Fscrolling%2Ffast-scroll-iframe-latched-mainframe.html

--- /Volumes/Data/slave/sierra-release-tests-wk2/build/layout-test-results/tiled-drawing/scrolling/fast-scroll-iframe-latched-mainframe-expected.txt
+++ /Volumes/Data/slave/sierra-release-tests-wk2/build/layout-test-results/tiled-drawing/scrolling/fast-scroll-iframe-latched-mainframe-actual.txt
@@ -12,15 +12,15 @@
 (GraphicsLayer
   (anchor 0.00 0.00)
   (bounds 785.00 2266.00)
-  (visible rect 0.00, 70.00 785.00 x 600.00)
-  (coverage rect 0.00, 70.00 785.00 x 600.00)
+  (visible rect 0.00, 20.00 785.00 x 600.00)
+  (coverage rect 0.00, 20.00 785.00 x 600.00)
   (intersects coverage rect 1)
   (contentsScale 1.00)
   (children 1
     (GraphicsLayer
       (bounds 785.00 2266.00)
       (contentsOpaque 1)
-      (visible rect 0.00, 70.00 785.00 x 600.00)
+      (visible rect 0.00, 20.00 785.00 x 600.00)
       (coverage rect 0.00, 0.00 785.00 x 1800.00)
       (intersects coverage rect 1)
       (contentsScale 1.00)

[Ryan Haddad]

This does not appear to be a recent regression.

[Matt Lewis]

Able to reproduce it locally with:
run-webkit-tests tiled-drawing/scrolling/fast-scroll-iframe-latched-mainframe.html -f --iterations=130 -g --no-retry-failures

issue occurs on El Capitan Debug wk2 as well.

current diff:
Put mouse here and flick downwards

Tests that iframe doesn't consume wheel events when scroll

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS successfullyParsed is true

TEST COMPLETE
PASS IFrame did not receive wheel events.
(GraphicsLayer
  (anchor 0.00 0.00)
  (bounds 785.00 2266.00)
  (visible rect 0.00, 10.00 785.00 x 600.00)
  (coverage rect 0.00, 10.00 785.00 x 600.00)
  (intersects coverage rect 1)
  (contentsScale 1.00)
  (children 1
    (GraphicsLayer
      (bounds 785.00 2266.00)
      (contentsOpaque 1)
      (visible rect 0.00, 10.00 785.00 x 600.00)
      (coverage rect 0.00, 0.00 785.00 x 1800.00)
      (intersects coverage rect 1)
      (contentsScale 1.00)
      (tile cache coverage 0, 0 785 x 2048)
      (tile size 785 x 512)
      (top left tile 0, 0 tiles grid 1 x 4)
      (in window 1)
    )
  )
)

[Matt Lewis]

Marked the test as flaky.
https://trac.webkit.org/changeset/216697/webkit/

[Matt Lewis]

The test has started to be flaky on Sierra Release WK2 as well as of build:
https://build.webkit.org/builders/Apple%20Sierra%20Release%20WK2%20(Tests)/builds/2048

[Matt Lewis]

Adjusted test expectations:
https://trac.webkit.org/changeset/219133/webkit/