Bug 196298

Summary: [iOS WK2] fast/viewport/ios/use-minimum-device-width-for-page-without-viewport-meta.html is a flaky failure
Product: WebKit Reporter: Shawn Roberts <sroberts>
Component: Tools / TestsAssignee: Wenson Hsieh <wenson_hsieh>
Status: RESOLVED FIXED    
Severity: Normal CC: ap, bdakin, commit-queue, koivisto, lforschler, simon.fraser, thorton, webkit-bot-watchers-bugzilla, webkit-bug-importer, wenson_hsieh, yongjun_zhang
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
See Also: https://bugs.webkit.org/show_bug.cgi?id=192377
https://bugs.webkit.org/show_bug.cgi?id=194198
Attachments:
Description Flags
Patch
none
Fix a ChangeLog typo none

Description Shawn Roberts 2019-03-27 08:45:36 PDT 
The following layout test is failing on iOS Simulator Release WK2

fast/viewport/ios/use-minimum-device-width-for-page-without-viewport-meta.html

Probable cause:

Test has been a flaky failure since the test was added in https://trac.webkit.org/changeset/238946/webkit . Failing around 4 times on average in 500 iterations from r238946 up until r240911

Changes made in https://trac.webkit.org/changeset/240912/webkit made test fail a lot more frequently. During testing found from 240912 up until current r243537 is failing approximately 10 times 60 attempts (setting testing to exit after 10 failures)

Reproduced with : 

run-webkit-tests fast/viewport/ios/use-minimum-device-width-for-page-without-viewport-meta.html --iterations 500 -f --ios-simulator --exit-after-n-failures=10

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Fviewport%2Fios%2Fuse-minimum-device-width-for-page-without-viewport-meta.html

--- /Volumes/Data/slave/ios-simulator-12-release-tests-wk2/build/layout-test-results/fast/viewport/ios/use-minimum-device-width-for-page-without-viewport-meta-expected.txt
+++ /Volumes/Data/slave/ios-simulator-12-release-tests-wk2/build/layout-test-results/fast/viewport/ios/use-minimum-device-width-for-page-without-viewport-meta-actual.txt
@@ -1,7 +1,7 @@
 setMinimumEffectiveWidth(640.00)
-window size: [640, 1096]
+window size: [320, 548]
 square size: [64, 110]
-zoom scale: 0.50
+zoom scale: 1.00
 
 setMinimumEffectiveWidth(768.00)
 window size: [768, 1315]
Comment 1 Shawn Roberts 2019-03-27 08:46:47 PDT 
Adding Yongjun Zhang who created the test.

Adding Simon Fraser who authored the change that made test more flaky.
Comment 2 Radar WebKit Bug Importer 2019-03-27 08:48:38 PDT 
<rdar://problem/49337021>
Comment 3 Shawn Roberts 2019-03-27 09:45:12 PDT 
Marked flaky in https://trac.webkit.org/changeset/243548/webkit
Comment 4 Wenson Hsieh 2019-10-25 14:17:43 PDT Comment hidden (obsolete)
Comment 5 Wenson Hsieh 2019-10-25 14:20:41 PDT 
Created attachment 381966 [details]
Fix a ChangeLog typo
Comment 6 WebKit Commit Bot 2019-10-25 19:36:27 PDT 
Comment on attachment 381966 [details]
Fix a ChangeLog typo

Clearing flags on attachment: 381966

Committed r251625: <https://trac.webkit.org/changeset/251625>
Comment 7 WebKit Commit Bot 2019-10-25 19:36:29 PDT 
All reviewed patches have been landed.  Closing bug.