[Webkit-unassigned] [Bug 217193] New: REGRESSION (r267814): [ Mojave+ release wk2 ] inspector/console/queryHolders.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217193

            Bug ID: 217193
           Summary: REGRESSION (r267814): [ Mojave+ release wk2 ]
                    inspector/console/queryHolders.html is a flaky 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:
inspector/console/queryHolders.html

The first failure that I see this on the dashboard was 09/30/20 at r267815, but does not appear to be relevant to what would have caused this.

I can reproduce this on r267814, but unable to reproduce on 267813 or earlier.
Commit r267814 has to do with implementing an {Array, %TypedArray%, String}.prototype.item, which could have introduced the flaky failure.  The change was introduced here https://trac.webkit.org/changeset/267814/webkit.

REPRODUCTION STEPS
Command: 
run-webkit-tests --exit-after-n-failures 1 --iterations 50 inspector/console/queryHolders.html

Result: 
Regressions: Unexpected text-only failures (1)
  inspector/console/queryHolders.html [ Failure ]

History:
https://results.webkit.org/?suite=layout-tests&test=inspector%2Fconsole%2FqueryHolders.html&platform=mac

Diff Log:
--- /Volumes/Data/slave/catalina-release-tests-wk2/build/layout-test-results/inspector/formatting/formatting-css-expected.txt
+++ /Volumes/Data/slave/catalina-release-tests-wk2/build/layout-test-results/inspector/formatting/formatting-css-actual.txt
@@ -1,14 +1,5 @@
-Test CSS formatting.
+#PID UNRESPONSIVE - WebKitTestRunner (pid 84131)
+FAIL: Timed out waiting for notifyDone to be called

-
-== Running test suite: CSSFormatter
--- Running test case: CSSFormatter
-PASS: basic.css
-PASS: comment.css
-PASS: gradient.css
-PASS: keyframes.css
-PASS: media-query.css
-PASS: selectors.css
-PASS: url.css
-PASS: wrapping.css
-
+#EOF
+#EOF

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