[Webkit-unassigned] [Bug 136347] New: WebContent hung while browsing some websites

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=136347

           Summary: WebContent hung while browsing some websites
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: psolanki at apple.com


We've got reports of WebContent hangs when browsing some pages. The following two sites have been reported

<http://www.liverpoolway.co.uk/index.php?/forum/1-ff-football-forum/>
<https://sports.yahoo.com/blogs/mlb-big-league-stew/mo-ne-davis-has-rough-outing-in-tough-matchup-with-las-vegas-003922244.html>

The spins show us doing a lot of allocation and memcpy under SharedBuffer::createCFData()

16  WebCore::SharedBuffer::createCFData() + 50 (WebCore + 52722) [0x7fff8fd70df2] 1-16
  16  WebCore::SharedBuffer::data() const + 68 (WebCore + 53780) [0x7fff8fd71214] 1-16
    16  WebCore::SharedBuffer::buffer() const + 36 (WebCore + 53828) [0x7fff8fd71244] 1-16
      16  WebCore::SharedBuffer::duplicateDataBufferIfNecessary() const + 117 (WebCore + 13117829) [0x7fff909e6985] 1-16
        16  WTF::Vector<char, 0ul, WTF::CrashOnOverflow>::operator=(WTF::Vector<char, 0ul, WTF::CrashOnOverflow> const&) + 223 (WebCore + 13118159) [0x7fff909e6acf] 1-16
          16  _platform_memmove$VARIANT$Ivybridge + 49 (libsystem_platform.dylib + 4913) [0x7fff82e76331] 1-16

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