[Webkit-unassigned] [Bug 76003] New: REGRESSION (r104210): WebProcess spins at 100% CPU for several minutes when loading an internal Apple site

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=76003

           Summary: REGRESSION (r104210): WebProcess spins at 100% CPU for
                    several minutes when loading an internal Apple site
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: InRadar, Regression
          Severity: Normal
          Priority: P1
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mrowe at apple.com
                CC: rniwa at webkit.org


After r104210 we're seeing WebProcess spin at 100% CPU for several minutes after loading pages on an internal Apple site. A sample shows that almost all of the time is being spent in DynamicSubtreeNodeList::length below calls to WebCore::JSNodeList::getOwnPropertySlotByIndex.  I'll attach a reduction that demonstrates the regression.

<rdar://problem/10672251>

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