[Webkit-unassigned] [Bug 222628] New: page hangs, crashes in WebCore::wordRangeFromPosition when using -webkit-user-select:none

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222628

            Bug ID: 222628
           Summary: page hangs, crashes in WebCore::wordRangeFromPosition
                    when using -webkit-user-select:none
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: iOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: andrew.vermie at gmail.com

Created attachment 422012

  --> https://bugs.webkit.org/attachment.cgi?id=422012&action=review

zip containing crash logs

In iOS 14.4, we are seeing page hangs (and eventually crashes) when using a css rule which includes -webkit-user-select:none

I've attached a handful of crash logs.

I have not been able to come up with a simple repro page; there seems to be some interaction among a few elements and styles, triggered by a touch.
The page this occurs on exhibits the issue quite easily; unfortunately it is not public.

Is there anything else I can provide while I work on making a version of this page available for debugging?

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