[Webkit-unassigned] [Bug 218607] New: REGRESSSION(r269390?) Several editing/ tests are flaky

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218607

            Bug ID: 218607
           Summary: REGRESSSION(r269390?) Several editing/ tests are flaky
           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: dpino at igalia.com

Several editing/ related tests became flaky in [r268384-r268400] https://build.webkit.org/builders/GTK-Linux-64-bit-Release-Tests/builds/16812

I bisected the range and I found I cannot reproduce the issue in r268384, but I can in r268390 (next revision in commit history). I can only reproduce the flaky failures if I run all the tests. If I run the offending tests only, they're not flaky.

So this might be a regression caused by r268390 or some other commits in the range r268385-r268389.

I append below the test reports for revisions r268384 and r268390 for comparison.

r268384:

=> Results: 53649/57126 tests passed (93.9%)

=> Tests to be fixed (13403):
     20 crashes                  ( 0.1%)
    119 timeouts                 ( 0.9%)
     20 missing results          ( 0.1%)
   2129 image-only failures      (15.9%)

=> Tests that will only be fixed if they crash (WONTFIX) (308):
      1 timeouts                 ( 0.3%)


Expected to fail, but passed: (6)
  imported/w3c/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-022.html
  imported/w3c/web-platform-tests/css/css-sizing/aspect-ratio/flex-aspect-ratio-010.html
  imported/w3c/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-invalid.html
  imported/w3c/web-platform-tests/css/css-sizing/whitespace-and-break.html
  storage/domstorage/sessionstorage/blocked-file-access.html
  webrtc/peerconnection-page-cache-long.html


Unexpected flakiness: text-only failures (1)
  imported/w3c/web-platform-tests/webaudio/the-audio-api/the-channelmergernode-interface/active-processing.https.html [ Failure Pass ]

Unexpected flakiness: timeouts (1)
  media/video-as-img-output-pts.html [ Timeout Pass ]


Regressions: Unexpected text-only failures (1)
  inspector/unit-tests/heap-snapshot-collection-event.html [ Failure ]

Regressions: Unexpected crashes (1)
  inspector/page/frameScheduledNavigation.html [ Crash ]

Regressions: Unexpected timeouts (1)
  workers/wasm-hashset-many.html [ Timeout ]

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r268390:

=> Results: 53629/57126 tests passed (93.9%)

=> Tests to be fixed (13423):
     20 crashes                  ( 0.1%)
    118 timeouts                 ( 0.9%)
     20 missing results          ( 0.1%)
   2128 image-only failures      (15.9%)

=> Tests that will only be fixed if they crash (WONTFIX) (308):
      1 timeouts                 ( 0.3%)


Expected to crash, but passed: (1)
  workers/wasm-hashset-many.html

Expected to fail, but passed: (5)
  imported/w3c/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-022.html
  imported/w3c/web-platform-tests/css/css-sizing/aspect-ratio/flex-aspect-ratio-010.html
  imported/w3c/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-invalid.html
  imported/w3c/web-platform-tests/css/css-sizing/whitespace-and-break.html
  storage/domstorage/sessionstorage/blocked-file-access.html


Unexpected flakiness: text-only failures (21)
  editing/selection/extend-after-mouse-selection.html [ Failure Pass ]
  editing/selection/extend-selection-backward-at-beginning-of-line-by-sentence-granularity.html [ Failure Pass ]
  editing/selection/extend-selection-backward-at-beginning-of-line-by-word-granularity.html [ Failure Pass ]
  editing/selection/focus-contenteditable-iframe.html [ Failure Pass ]
  editing/selection/getRangeAt.html [ Failure Pass ]
  editing/selection/move-by-word-visually-across-object-element-1.html [ Failure Pass ]
  editing/selection/move-by-word-visually-across-object-element-2.html [ Failure Pass ]
  editing/selection/move-by-word-visually-across-object-element-3.html [ Failure Pass ]
  editing/selection/select-all-user-select-none.html [ Failure Pass ]
  editing/selection/select-out-of-floated-non-editable-02.html [ Failure Pass ]
  editing/selection/select-out-of-floated-non-editable-07.html [ Failure Pass ]
  editing/selection/select-out-of-floated-non-editable-10.html [ Failure Pass ]
  editing/selection/shift-click-includes-existing-selection.html [ Failure Pass ]
  editing/selection/shift-click.html [ Failure Pass ]
  editing/selection/toString-1.html [ Failure Pass ]
  editing/selection/user-select-all-selection.html [ Failure Pass ]
  editing/selection/user-select-all-with-shift.html [ Failure Pass ]
  editing/selection/user-select-all-with-single-click.html [ Failure Pass ]
  imported/w3c/web-platform-tests/html/semantics/forms/form-submission-0/url-encoded.html [ Failure Pass ]
  imported/w3c/web-platform-tests/html/semantics/forms/the-label-element/labelable-elements.html [ Failure Pass ]
  imported/w3c/web-platform-tests/html/semantics/interfaces.html [ Failure Pass ]


Regressions: Unexpected text-only failures (1)
  inspector/unit-tests/heap-snapshot-collection-event.html [ Failure ]

Regressions: Unexpected crashes (1)
  inspector/dom/setInspectedNode.html [ Crash ]

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