[Webkit-unassigned] [Bug 192250] New: REGRESSION: [ iOS Sim ] Layout Test imported/w3c/web-platform-tests/service-workers/service-worker/update-missing-import-scripts.https.html is failing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=192250

            Bug ID: 192250
           Summary: REGRESSION: [ iOS Sim ] Layout Test
                    imported/w3c/web-platform-tests/service-workers/servic
                    e-worker/update-missing-import-scripts.https.html is
                    failing
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tsavell at apple.com
                CC: lforschler at apple.com

The following layout test is failing on iOS Sim

imported/w3c/web-platform-tests/service-workers/service-worker/update-missing-import-scripts.https.html

Probable cause:

Test began failing recently only on iOS. The diff is long but the outcome is many printed statements about RenderBlock and RenderText. We need to try and find the regression. 

excerpt:

--- /Volumes/Data/slave/ios-simulator-12-release-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/service-workers/service-worker/update-missing-import-scripts.https-expected.txt
+++ /Volumes/Data/slave/ios-simulator-12-release-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/service-workers/service-worker/update-missing-import-scripts.https-actual.txt
@@ -1,4 +1,79 @@
-
-PASS Initialize global state 
-PASS Update service worker with new script that's missing importScripts() 
-
+layer at (0,0) size 800x600
+  RenderView at (0,0) size 800x600
+layer at (0,0) size 800x557
+  RenderBlock {HTML} at (0,0) size 800x557
+    RenderBody {BODY} at (8,19) size 784x530
+      RenderBlock {DIV} at (0,0) size 784x529
+        RenderBlock {SECTION} at (0,0) size 784x143
+          RenderBlock {H2} at (0,0) size 784x29
+            RenderText {#text} at (0,0) size 110x28
+              text run at (0,0) width 110: "Summary"
+          RenderBlock {SECTION} at (0,48) size 784x21
+            RenderBlock {P} at (0,0) size 784x20
+              RenderText {#text} at (0,0) size 116x19
+                text run at (0,0) width 116: "Harness status: "
+              RenderInline {SPAN} at (0,0) size 24x19

Diff:
https://build.webkit.org/results/Apple%20iOS%2012%20Simulator%20Release%20WK2%20(Tests)/r238744%20(1272)/imported/w3c/web-platform-tests/service-workers/service-worker/update-missing-import-scripts.https-diff.txt

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=imported%2Fw3c%2Fweb-platform-tests%2Fservice-workers%2Fservice-worker%2Fupdate-missing-import-scripts.https.html

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