Bug 171935 – [maOS Sierra] LayoutTest tiled-drawing/scrolling/fast-scroll-select-latched-mainframe.html is flaky

• Component: New Bugs
• Status: NEW

[Matt Lewis]

The test tiled-drawing/scrolling/fast-scroll-select-latched-mainframe.html is a flaky failure on Sierra release and debug as well as El Capitan debug.

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

Build:
https://build.webkit.org/builders/Apple%20Sierra%20Debug%20WK2%20(Tests)/builds/919
https://build.webkit.org/results/Apple%20Sierra%20Debug%20WK2%20(Tests)/r216586%20(919)/results.html

Diff:
--- /Volumes/Data/slave/sierra-debug-tests-wk2/build/layout-test-results/tiled-drawing/scrolling/fast-scroll-select-latched-mainframe-expected.txt
+++ /Volumes/Data/slave/sierra-debug-tests-wk2/build/layout-test-results/tiled-drawing/scrolling/fast-scroll-select-latched-mainframe-actual.txt
@@ -14,15 +14,15 @@
 (GraphicsLayer
   (anchor 0.00 0.00)
   (bounds 2008.00 2266.00)
-  (visible rect 0.00, 70.00 785.00 x 585.00)
-  (coverage rect 0.00, 70.00 785.00 x 585.00)
+  (visible rect 0.00, 30.00 785.00 x 585.00)
+  (coverage rect 0.00, 30.00 785.00 x 585.00)
   (intersects coverage rect 1)
   (contentsScale 1.00)
   (children 1
     (GraphicsLayer
       (bounds 2008.00 2266.00)
       (contentsOpaque 1)
-      (visible rect 0.00, 70.00 785.00 x 585.00)
+      (visible rect 0.00, 30.00 785.00 x 585.00)
       (coverage rect 0.00, 0.00 1570.00 x 1755.00)
       (intersects coverage rect 1)
       (contentsScale 1.00)

[Matt Lewis]

Marked test as flaky on Sierra.
https://trac.webkit.org/changeset/216604/webkit/

[Alexey Proskuryakov]

Is this reproducible?

[Matt Lewis]

I was able to reproduce this fairly consistently with:

run-webkit-tests --no-retry-failure tiled-drawing/scrolling/fast-scroll-select-latched-mainframe.html --iterations=100 --verbose -f

[Radar WebKit Bug Importer]

<rdar://problem/42793080>

[Shawn Roberts]

Test is still flaky on Mac

Flakiness dashboard:

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

Able to reproduce with:

run-webkit-tests --root t240655 tiled-drawing/scrolling/fast-scroll-select-latched-mainframe.html --iterations 500  -f

Diff: 

Regressions: Unexpected text-only failures (1)
  tiled-drawing/scrolling/fast-scroll-select-latched-mainframe.html [ Failure ]

Regressions: Unexpected image-only failures (1)
  webgpu/buffer-resource-triangles.html [ ImageOnlyFailure ]

Regressions: Unexpected timeouts (1)
  http/wpt/service-workers/check-service-worker-header.https.html [ Timeout ]

[Shawn Roberts]

(In reply to Shawn Roberts from comment #5)
> Test is still flaky on Mac
> 
> Flakiness dashboard:
> 
> https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.
> html#showAllRuns=true&tests=tiled-drawing%2Fscrolling%2Ffast-scroll-select-
> latched-mainframe.html
> 
> Able to reproduce with:
> 
> run-webkit-tests --root t240655
> tiled-drawing/scrolling/fast-scroll-select-latched-mainframe.html
> --iterations 500  -f
> 
> Diff: 
> 
> Regressions: Unexpected text-only failures (1)
>   tiled-drawing/scrolling/fast-scroll-select-latched-mainframe.html [
> Failure ]
> 
> Regressions: Unexpected image-only failures (1)
>   webgpu/buffer-resource-triangles.html [ ImageOnlyFailure ]
> 
> Regressions: Unexpected timeouts (1)
>   http/wpt/service-workers/check-service-worker-header.https.html [ Timeout ]

Correction:

Pasted wrong content into Diff. Same diff was previously reported on 2017-05-10