[Webkit-unassigned] [Bug 217419] New: REGRESSION (iOS 14): [ iOS wk2 ] imported/w3c/web-platform-tests/css/css-cascade/all-prop-initial-xml.html is a constant failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217419

            Bug ID: 217419
           Summary: REGRESSION (iOS 14): [ iOS wk2 ]
                    imported/w3c/web-platform-tests/css/css-cascade/all-pr
                    op-initial-xml.html is a constant failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rackler at apple.com

Description:
imported/w3c/web-platform-tests/css/css-cascade/all-prop-initial-xml.html

The first failure that I see this on the dashboard was 09/28/20 at r267713, but does not appear to be relevant to what would have caused this.

REPRODUCTION STEPS
I can reproduce this on r268082, r267713 and earlier.

The test passed with iOS 13, but is constant failure with iOS 14.

Command: 
run-webkit-tests --ios-simulator --exit-after-n-failures 1 --exit-after-n-crashes-or-timeouts 1 imported/w3c/web-platform-tests/css/css-cascade/all-prop-initial-xml.html

Result: 
Regressions: Unexpected text-only failures (1)
  imported/w3c/web-platform-tests/css/css-cascade/all-prop-initial-xml.html [ Failure ]

History:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fcss%2Fcss-cascade%2Fall-prop-initial-xml.html&platform=ios&limit=50000

Diff Log:
--- /Volumes/Data/Builds/build-268082/layout-test-results/imported/w3c/web-platform-tests/css/css-cascade/all-prop-initial-xml-expected.txt
+++ /Volumes/Data/Builds/build-268082/layout-test-results/imported/w3c/web-platform-tests/css/css-cascade/all-prop-initial-xml-actual.txt
@@ -172,6 +172,7 @@
 PASS marker-start
 PASS mask
 PASS mask-type
+PASS math-style
 PASS max-block-size
 PASS max-height
 PASS max-inline-size
@@ -214,9 +215,11 @@
 PASS r
 PASS resize
 PASS right
+PASS rotate
 PASS row-gap
 PASS rx
 PASS ry
+PASS scale
 PASS scroll-behavior
 PASS scroll-padding-bottom
 PASS scroll-padding-left
@@ -275,6 +278,7 @@
 PASS transition-duration
 PASS transition-property
 PASS transition-timing-function
+PASS translate
 PASS unicode-bidi
 PASS vector-effect
 PASS vertical-align


———————


I can reproduce this on <commit>, but unable to reproduce on <commit>.
Commit <rxxxx> has to do with [insert], which could have introduced the flakiness/failure.  The change was introduced here <insert link>.

and has to do with [insert] which could have introduced the flakiness. The change was introduced here <insert link>.

but I was not able to find a commit that seemed relevant; due to the lack of spades in that range, I cannot pinpoint what change could have caused this. 

There is the chance that this is from the OS progression between Azul18A320 - Azul18A336.

Some Apple internal Mac tests expectations were migrated into WebKit sources, and seems to have introduced to consistent failures.

This tests was rebaselined in <trac> and that seemed to have introduced the flakiness.

This test was added with the WPT re-sync in <trac>, and seems to have been flaky since the start.

This test was modified in the WPT re-sync in <trac>, so that probably introduced the flakiness.

Screening as GoldenGate Candidate / Escape since this is a consistent failure that may be a system regression.

There is the chance that this is an OS regression between Azul18A320 - Azul18A336. We have gaps in test result history due to rdar://65042181

We don’t currently have any mechanism to skip tests specifically for GuardMalloc, only combinations of OS version, WK1/WK2, release/debug.

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