[Webkit-unassigned] [Bug 239101] New: REGRESSION (r292043): [ Mac ] fast/block/positioning/fixed-container-with-relative-parent.html is a flaky image failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239101

            Bug ID: 239101
           Summary: REGRESSION (r292043): [ Mac ]
                    fast/block/positioning/fixed-container-with-relative-p
                    arent.html is a flaky image 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

Created attachment 457307

  --> https://bugs.webkit.org/attachment.cgi?id=457307&action=review

Actual

Description:
fast/block/positioning/fixed-container-with-relative-parent.html

The first image failure that I see this on the dashboard was 03/29/22 at r292045, but I was not able to find a commit that seemed relevant that would have caused this.

REPRODUCTION STEPS
I can reproduce this on r292043, but unable to reproduce on r292042.

Command: 
run-webkit-tests --root --exit-after-n-failures 1 --exit-after-n-crashes-or-timeouts 1 --iterations 50 fast/block/positioning/fixed-container-with-relative-parent.html

Result: 
[10/50] fast/block/positioning/fixed-container-with-relative-parent.html failed unexpectedly (reference mismatch maxDifference=255; totalPixels=1240)
Exiting early after 2 failures. 10 tests run.
8 tests ran as expected, 2 didn't (40 didn't run):

History:
https://results.webkit.org/?suite=layout-tests&test=fast%2Fblock%2Fpositioning%2Ffixed-container-with-relative-parent.html&platform=mac&limit=49920&version_name=Big%20Sur&version_name=Monterey

Link to image diff:
https://build.webkit.org/results/Apple-BigSur-Debug-AppleSilicon-WK2-Tests/r292729%20(5534)/fast/block/positioning/fixed-container-with-relative-parent-diffs.html

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