[Webkit-unassigned] [Bug 54570] New: Hangs for a very long time

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=54570

           Summary: Hangs for a very long time
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
               URL: http://code.google.com/p/namebench/source/browse/trunk
                    /data/alexa-top-2000-domains.txt?spec=svn854&r=854
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Critical
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: silvio.ventres at gmail.com


Go to the page, wait a bit and behold webkit hanging almost forever.

Instruments show HTMLTableRowsCollection::rowAfter as the function being called 78.5% of time, with the following tree of symbols shown:
78.5% WebCore::HTMLTableRowsCollection::rowAfter(..)
71.7% WebCore::HTMLCollection::calcLength()
71.7% WebCore::HTMLCollection::length()
splits into two:

  38.7% WebCore::jsHTMLCollectionLength()
  38.7% JSC::JSValue::get(..)

and:

  33.0% WebCore::JSHTMLCollection::getOwnPropertySlot(..)
  32.9% cti_op_get_by_val

Firefox 4beta9+ doesn't hang, taking about 20 seconds to render the page and takes 0% CPU time.

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