[Webkit-unassigned] [Bug 52143] New: 100% CPU usage with exeCommand

Mon Jan 10 02:32:57 PST 2011

https://bugs.webkit.org/show_bug.cgi?id=52143

           Summary: 100% CPU usage with exeCommand
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows Vista
            Status: NEW
          Severity: Normal
          Priority: P1
         Component: HTML Editing
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: skylined at chromium.org
                CC: eric at webkit.org

Created an attachment (id=78385)
 --> (https://bugs.webkit.org/attachment.cgi?id=78385&action=review)
Repro

Chromium bug: http://code.google.com/p/chromium/issues/detail?id=69042

Repro:
<script>
  function go() {
    var iInterval = setInterval(repro, 100);
    setTimeout(function() {
      clearTimeout(iInterval);
      document.body.innerHTML = 'PASS';
    }, 1000);
  }
  function repro() {
    document.designMode="on";
    document.execCommand("selectall",false);
    document.execCommand("InsertImage",false);
    document.execCommand("SelectAll");
    document.execCommand("insertorderedlist");
    document.execCommand("Outdent");
    document.execCommand("justifyleft",false);
    document.execCommand("Underline",false);
    document.execCommand("insertorderedlist",false);
    document.execCommand("InsertHorizontalRule");
    document.execCommand("Indent");
    document.execCommand("SelectAll",false);
    document.execCommand("justifycenter");
    document.execCommand("InsertHorizontalRule",false);
    document.execCommand("insertorderedlist",false);
    document.execCommand("selectall",false);
    document.execCommand("RemoveFormat");
    document.execCommand("justifyright",false);
    document.execCommand("insertorderedlist");
    document.execCommand("indent");
    document.execCommand("justifycenter");
    document.execCommand("Indent");
    document.execCommand("insertunorderedlist",false);
    document.execCommand("Indent",false);
    document.execCommand("InsertImage",false);
    document.execCommand("InsertParagraph",false);
    document.execCommand("delete",false);
    document.execCommand("selectall",false);
    document.execCommand("justifyright");
    document.execCommand("Outdent");
    document.execCommand("underline");
    document.execCommand("InsertParagraph");
    document.execCommand("inserthorizontalrule",false);
    document.execCommand("Outdent");
    document.execCommand("insertorderedlist");
    document.execCommand("selectall",false);
    document.execCommand("Outdent",false);
    document.execCommand("Outdent",false);
  }
</script>
<body onload="go();"></body>

The repro can probably be reduced a lot further. It should show "PASS" after running for 1 second, but it ends up in an infinite loop and uses 100% CPU forever.

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