Bug 167187 – REGRESSION: [mac-wk2 debug] LayoutTest fast/frames/flattening/frameset-flattening-simple.html

• Component: New Bugs
• Status: NEW

[Ryan Haddad]

LayoutTest fast/frames/flattening/frameset-flattening-simple.html is a flaky failure

https://build.webkit.org/results/Apple%20El%20Capitan%20Debug%20WK2%20(Tests)/r210892%20(10458)/results.html

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Fframes%2Fflattening%2Fframeset-flattening-simple.html

--- /Volumes/Data/slave/elcapitan-debug-tests-wk2/build/layout-test-results/fast/frames/flattening/frameset-flattening-simple-expected.txt
+++ /Volumes/Data/slave/elcapitan-debug-tests-wk2/build/layout-test-results/fast/frames/flattening/frameset-flattening-simple-actual.txt
@@ -1,14 +1,14 @@
-layer at (0,0) size 1000x600
-  RenderView at (0,0) size 800x585
-layer at (0,0) size 800x600
-  RenderBlock {HTML} at (0,0) size 800x600
-    RenderFrameSet {FRAMESET} at (0,0) size 1000x600
-      RenderFrame {FRAME} at (0,0) size 800x600
-        layer at (0,0) size 800x600
-          RenderView at (0,0) size 800x600
-        layer at (0,0) size 800x600
-          RenderBlock {HTML} at (0,0) size 800x600
-            RenderBody {BODY} at (8,8) size 784x576 [bgcolor=#008000]
+layer at (0,0) size 1000x585
+  RenderView at (0,0) size 785x585
+layer at (0,0) size 785x585
+  RenderBlock {HTML} at (0,0) size 785x585
+    RenderFrameSet {FRAMESET} at (0,0) size 1000x585
+      RenderFrame {FRAME} at (0,0) size 800x585
+        layer at (0,0) size 800x585
+          RenderView at (0,0) size 800x585
+        layer at (0,0) size 800x585
+          RenderBlock {HTML} at (0,0) size 800x585
+            RenderBody {BODY} at (8,8) size 784x561 [bgcolor=#008000]
               RenderBlock {P} at (0,0) size 784x18
                 RenderText {#text} at (0,0) size 450x18
                   text run at (0,0) width 450: "Test for frameset flattening. The flattening only works inside the DRT."
@@ -17,9 +17,9 @@
                   text run at (0,0) width 467: "This frame should be 800px wide and not be scrollable (have scrollbars)."
         layer at (0,100) size 800x1
           RenderBlock (positioned) {DIV} at (0,100) size 800x1
-      RenderFrame {FRAME} at (800,0) size 200x600
-        layer at (0,0) size 200x600
-          RenderView at (0,0) size 200x600
-        layer at (0,0) size 200x600
-          RenderBlock {HTML} at (0,0) size 200x600
-            RenderBody {BODY} at (8,8) size 184x584
+      RenderFrame {FRAME} at (800,0) size 200x585
+        layer at (0,0) size 200x585
+          RenderView at (0,0) size 200x585
+        layer at (0,0) size 200x585
+          RenderBlock {HTML} at (0,0) size 200x585
+            RenderBody {BODY} at (8,8) size 184x569

[Ryan Haddad]

According to the flakiness dashboard, this is a recent regression, with the first failure on macOS on 12/11/2016 11:33:45 PM @ r209697.

[Alexey Proskuryakov]

This test did regress around this date on debug bots, however GuardMalloc bots have been flakily failing since at least October, if not forever. Maybe a change in performance characteristics.