[Webkit-unassigned] [Bug 175243] New: Crashes in WebCore since iOS 11 beta 3

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=175243

            Bug ID: 175243
           Summary: Crashes in WebCore since iOS 11 beta 3
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: erezg at microsoft.com

Created attachment 317360

  --> https://bugs.webkit.org/attachment.cgi?id=317360&action=review

5 different crashes in WebCore

Hi.

Since iOS 11 beta 3 came out, we've started to get crashes during a login flow involving UIWebView with a password box.
Our app also has several WKWebViews preloaded and kept in memory for future use.
We don't get these crashes when the WKWebViews aren't loaded (no loadRequest is called)

Attached here is a ZIP with 5 crash examples (we get different ones). The crash usually happens when moving out of a password box and tapping a button.

Main Thread stack traces tops:
- WebCore::RenderBox::scrollPosition()
- WebCore::RenderLayer::hitTestList
- WebCore::LayoutState::LayoutState

Web Thread stack traces tops:
- WebCore::FontRanges::fontForFirstRange() (crash on overflow)
- WebCore::RenderBlockFlow::estimateLogicalTopPosition

Would appreciate your help.

Thanks!

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