Bug 229874 - [ iOS EWS ] imported/w3c/web-platform-tests/css/css-sizing/percentage-height-in-flexbox.html is a flaky failure
Summary: [ iOS EWS ] imported/w3c/web-platform-tests/css/css-sizing/percentage-height-...
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: CSS (show other bugs)
Version: WebKit Nightly Build
Hardware: iPhone / iPad Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2021-09-03 09:07 PDT by ayumi_kojima
Modified: 2021-09-03 15:55 PDT (History)
6 users (show)

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Description ayumi_kojima 2021-09-03 09:07:01 PDT 
imported/w3c/web-platform-tests/css/css-sizing/percentage-height-in-flexbox.html

Is a flaky failure on iOS-14-Simulator-WK2-Tests-EWS.

The flaky failure is not showing up in the open source directory: https://results.webkit.org/?suite=layout-tests&test=imported/w3c/web-platform-tests/css/css-sizing/percentage-height-in-flexbox.html

The flakiness started at https://ews-build.webkit.org/#/builders/51/builds/16024.

Diff:

--- /Volumes/Data/worker/iOS-14-Simulator-WK2-Tests-EWS/build/layout-test-results/imported/w3c/web-platform-tests/css/css-sizing/percentage-height-in-flexbox-expected.txt
+++ /Volumes/Data/worker/iOS-14-Simulator-WK2-Tests-EWS/build/layout-test-results/imported/w3c/web-platform-tests/css/css-sizing/percentage-height-in-flexbox-actual.txt
@@ -1,5 +1,5 @@
 
 
-PASS #target offsetSize matches #container offsetSize
-PASS #target offsetSize matches #container offsetSize after resize
+FAIL #target offsetSize matches #container offsetSize assert_equals: expected 50 but got 0
+FAIL #target offsetSize matches #container offsetSize after resize assert_equals: expected 100 but got 0
Comment 1 Radar WebKit Bug Importer 2021-09-03 09:07:38 PDT 
<rdar://problem/82725820>
Comment 2 ayumi_kojima 2021-09-03 09:24:51 PDT 
Marked test expectations: https://trac.webkit.org/changeset/282000/webkit
Comment 3 ayumi_kojima 2021-09-03 15:47:49 PDT 
Apparently the test has been flaky failing in the open source directory. I was able to reproduce the failure locally at TOT and r267075 using run-webkit-tests --iterations 50 --exit-after-n-failures 1 imported/w3c/web-platform-tests/css/css-sizing/percentage-height-in-flexbox.html --force --ios-simulator.

The test timed out at r267007 and the oldest revision available (r266320). The regression range is between r267008 and r267075, but I wasn't able to pinpoint since there are no testable revisions available in-between.