[Webkit-unassigned] [Bug 239405] New: [ Mac ] fast/css/counters/element-removal-crash.xhtml is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239405

            Bug ID: 239405
           Summary: [ Mac ] fast/css/counters/element-removal-crash.xhtml
                    is a flaky failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rackler at apple.com

Description:
fast/css/counters/element-removal-crash.xhtml 

The first failure affecting [ Mac ] that I see on the dashboard was 3/28/2022 at r292007 and has to do with WKWebView` API to control CSS "small viewport" `sv*` and "large viewport" `lv*` units which could have introduced the added flakiness. The change was made here https://bugs.webkit.org/attachment.cgi?id=455306&action=review.

REPRODUCTION STEPS
Due to the lack of spades, the closest to test is r292010.
I can reproduce this on r292010, but am unable to reproduce on r292002.

Command: 
run-webkit-tests --root --exit-after-n-failures 1 --exit-after-n-crashes-or-timeouts 1 --iterations 2000 --no-retry --force

Result: 
[756/2000] fast/css/counters/element-removal-crash.xhtml failed unexpectedly (text diff)
Exiting early after 2 failures. 756 tests run.


754 tests ran as expected, 2 didn't (1244 didn't run):


Unexpected flakiness: text-only failures (1)
  fast/css/counters/element-removal-crash.xhtml [ Failure Pass ]

History:
https://results.webkit.org/?suite=layout-tests&test=fast%2Fcss%2Fcounters%2Felement-removal-crash.xhtml&platform=mac&limit=50000K

Diff:
--- /Volumes/Data/worker/monterey-release-applesilicon-tests-wk2/build/layout-test-results/fast/css/counters/element-removal-crash-expected.txt
+++ /Volumes/Data/worker/monterey-release-applesilicon-tests-wk2/build/layout-test-results/fast/css/counters/element-removal-crash-actual.txt
@@ -1 +1,6 @@
+This page contains the following errors:
+
+error on line 32 at column 1: Extra content at the end of the document
+Below is a rendering of the page up to the first error.
+
 PASS

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