Bug 27878 infinite loop?
build N1206 on Win2K, IBM VM 1.3.1 in the big workspace I started up, opened the java perspective and navigated to org.eclipse.core.resources/src. When I clicked to expand the src folder my CPU went to 100% for alone time (forever?). Using ctrl-break I got the attached core dump which indicates that the RenameSupport.create() method appears to be called infinitely. Note that memory use does not seem to be increasing.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/refactoring/RenameSupport.java
* @param element the <tt>IJavaElement</tt> to be renamed
	 * @param flags flags controlling additional parameters. For a list of valid
	 * flags see the corresponding create methods of this class.
	 * @return the <tt>RenameSupport</tt>.
	 * @throws CoreException if an unexpected error occured while creating
	 * the <tt>RenameSupport</tt>.
	 * 
	 * @see #create(IJavaProject, int)
	 * @see #create(IPackageFragmentRoot)
	 * @see #create(IPackageFragment, int)
	 * @see #create(ICompilationUnit, int)
	 * @see #create(IType, int)
	 * @see #create(IMethod, int)
	 * @see #create(IField, int)
	 */
	public static RenameSupport create(IJavaElement element, int flags) throws CoreException {
		switch (element.getElementType()) {
			case IJavaElement.JAVA_PROJECT:
				return create((IJavaProject)element, flags); 
			case IJavaElement.PACKAGE_FRAGMENT_ROOT:
				return create((IPackageFragmentRoot)element, flags); 
			case IJavaElement.PACKAGE_FRAGMENT:
				return create((IPackageFragment)element, flags); 
			case IJavaElement.COMPILATION_UNIT:
				return create((ICompilationUnit)element, flags); 
			case IJavaElement.TYPE:
				return create((IType)element, flags); 
			case IJavaElement.METHOD:
				return create((IMethod)element, flags); 
			case IJavaElement.FIELD: