The following 17 tests are flakey failures on BigSur wk2 Release: fast/forms/date/date-editable-components/date-editable-components-keyboard-events.html fast/forms/date/date-editable-components/date-editable-components-mouse-events.html fast/forms/date/date-editable-components/date-picker-update-on-edit.html fast/forms/date/date-input-rendering-basic.html fast/forms/date/date-pseudo-elements.html fast/forms/datetimelocal/datetimelocal-editable-components/datetimelocal-editable-components-focus-and-blur-events.html fast/forms/datetimelocal/datetimelocal-editable-components/datetimelocal-editable-components-keyboard-events.html fast/forms/datetimelocal/datetimelocal-editable-components/datetimelocal-editable-components-mouse-events.html fast/forms/datetimelocal/datetimelocal-editable-components/datetimelocal-editable-components-second-and-millisecond-field.html fast/forms/datetimelocal/datetimelocal-editable-components/datetimelocal-picker-update-on-edit.html fast/forms/time-input-svg-font.html fast/forms/time/time-editable-components/time-editable-components-focus-and-blur-events.html fast/forms/time/time-editable-components/time-editable-components-keyboard-events.html fast/forms/time/time-editable-components/time-editable-components-mouse-events.html fast/forms/time/time-editable-components/time-editable-components-second-and-millisecond-field.html fast/forms/time/time-input-rendering-basic.html fast/text/hyphenate-locale.html All 17 tests have the same failure history: HISTORY: https://results.webkit.org/?platform=mac&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&test=fast%2Fforms%2Fdate%2Fdate-editable-components%2Fdate-editable-components-keyboard-events.html&test=fast%2Fforms%2Fdate%2Fdate-editable-components%2Fdate-editable-components-mouse-events.html&test=fast%2Fforms%2Fdate%2Fdate-editable-components%2Fdate-picker-update-on-edit.html&test=fast%2Fforms%2Fdate%2Fdate-input-rendering-basic.html&test=fast%2Fforms%2Fdate%2Fdate-pseudo-elements.html&test=fast%2Fforms%2Fdatetimelocal%2Fdatetimelocal-editable-components%2Fdatetimelocal-editable-components-focus-and-blur-events.html&test=fast%2Fforms%2Fdatetimelocal%2Fdatetimelocal-editable-components%2Fdatetimelocal-editable-components-keyboard-events.html&test=fast%2Fforms%2Fdatetimelocal%2Fdatetimelocal-editable-components%2Fdatetimelocal-editable-components-mouse-events.html&test=fast%2Fforms%2Fdatetimelocal%2Fdatetimelocal-editable-components%2Fdatetimelocal-editable-components-second-and-millisecond-field.html&test=fast%2Fforms%2Fdatetimelocal%2Fdatetimelocal-editable-components%2Fdatetimelocal-picker-update-on-edit.html&test=fast%2Fforms%2Ftime-input-svg-font.html&test=fast%2Fforms%2Ftime%2Ftime-editable-components%2Ftime-editable-components-focus-and-blur-events.html&test=fast%2Fforms%2Ftime%2Ftime-editable-components%2Ftime-editable-components-keyboard-events.html&test=fast%2Fforms%2Ftime%2Ftime-editable-components%2Ftime-editable-components-mouse-events.html&test=fast%2Fforms%2Ftime%2Ftime-editable-components%2Ftime-editable-components-second-and-millisecond-field.html&test=fast%2Fforms%2Ftime%2Ftime-input-rendering-basic.html&test=fast%2Ftext%2Fhyphenate-locale.html
Created attachment 425940 [details] Text Failure Diffs Attaching all 17 text diffs to this bug.
<rdar://problem/76622634>
Is this some state leaking from a preceding test? Also, this is a recent regression. What revision did this start with?
This looks like a wrong locale being used. The first failure is https://trac.webkit.org/r275892, but I don't see any obvious culprits landed before it.
Looking at ardor comments, I see that one of the bots had system language set to UK English. This may still be a problem with a test though, as it seem unlikely that anyone did it manually.