Bug 242905

Summary:	[ iOS15 ] compositing/tiling/tiled-mask-inwindow.html is a flaky failure
Product:	WebKit	Reporter:	Hercules Hjalmarsson <hhjalmarsson>
Component:	New Bugs	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	simon.fraser, webkit-bot-watchers-bugzilla, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Hercules Hjalmarsson 2022-07-19 09:57:08 PDT

compositing/tiling/tiled-mask-inwindow.html

Is a flaky text failure on iOS15 ToT.

HISTORY:
https://results.webkit.org/?suite=layout-tests&test=compositing%2Ftiling%2Ftiled-mask-inwindow.html

DIFF:
--- /Volumes/Data/worker/Apple-iOS-15-Simulator-Debug-WK2-Tests/build/layout-test-results/compositing/tiling/tiled-mask-inwindow-expected.txt
+++ /Volumes/Data/worker/Apple-iOS-15-Simulator-Debug-WK2-Tests/build/layout-test-results/compositing/tiling/tiled-mask-inwindow-actual.txt
@@ -55,9 +55,9 @@
     (GraphicsLayer
       (bounds 800.00 1065.00)
       (contentsOpaque 1)
-      (tile cache coverage 0, 0 800 x 600)
-      (tile size 800 x 600)
-      (top left tile 0, 0 tiles grid 1 x 1)
+      (tile cache coverage 0, 0 800 x 1024)
+      (tile size 800 x 512)
+      (top left tile 0, 0 tiles grid 1 x 2)
       (in window 1)
       (children 1
         (GraphicsLayer

DIFF URL:
https://build.webkit.org/results/Apple-iOS-15-Simulator-Debug-WK2-Tests/252594@main%20(3183)/compositing/tiling/tiled-mask-inwindow-pretty-diff.html

Comment 1 Radar WebKit Bug Importer 2022-07-19 09:57:30 PDT

<rdar://problem/97265746>

Comment 2 Hercules Hjalmarsson 2022-07-19 10:07:13 PDT

I was able to get a very similar diff output on iOS15 ToT running 200 iterations of command:

run-webkit-tests -f --force compositing/tiling/tiled-mask-inwindow.html

DIFF:
--- /Volumes/Data/Builds/iOS/-/Debug/-/layout-test-results/compositing/tiling/tiled-mask-inwindow-expected.txt
+++ /Volumes/Data/Builds/iOS/-/Debug/-/layout-test-results/compositing/tiling/tiled-mask-inwindow-actual.txt
@@ -55,9 +55,9 @@
     (GraphicsLayer
       (bounds 800.00 1065.00)
       (contentsOpaque 1)
-      (tile cache coverage 0, 0 800 x 600)
+      (tile cache coverage 0, 0 800 x 1065)
       (tile size 800 x 600)
-      (top left tile 0, 0 tiles grid 1 x 1)
+      (top left tile 0, 0 tiles grid 1 x 2)
       (in window 1)
       (children 1
         (GraphicsLayer

Comment 3 EWS 2022-07-19 15:38:28 PDT

Test gardening commit 252619@main (15838d58ee88): <https://commits.webkit.org/252619@main>

Reviewed commits have been landed. Closing PR #2566 and removing active labels.