[Webkit-unassigned] [Bug 288378] New: REGRESSION(~289398 at main): Flakey imported/w3c/web-platform-tests/css/css-grid/grid-items/* failure on WebKitLegacy

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=288378

            Bug ID: 288378
           Summary: REGRESSION(~289398 at main): Flakey
                    imported/w3c/web-platform-tests/css/css-grid/grid-item
                    s/* failure on WebKitLegacy
           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: jbedard at apple.com

Sometimes, many imported/w3c/web-platform-tests/css/css-grid/grid-items/* tests start failing on WebKitLegacy. The first failure we see in infrastructure is at 289398 at main, although this is merely the upper bound of the regression point, not the regression point itself. (determined based on https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fcss%2Fcss-grid%2Fgrid-items%2Fanonymous-grid-item-001.html)

https://ews-build.webkit.org/#/builders/135/builds/481 is an example of this failure mode in EWS.

What especially odd about this failure mode is that it seems that every-other 'css-grid/grid-items' test is failing, rather than every single test when we find ourselves in this mode. It means that we're likely not dealing with an off-by-1 error.

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