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There is a bug in class vtkRemoveDuplicatePolys. In the vtkRemoveDuplicatePolys.cxx file at line 75, it new a new vtkIdList, i.e. vtkIdList* polyPoints = vtkIdList::New(); but at the end of this file, if there is not duplicated polys, the variable "ndup" is zero, then the variable "polyPoints" will not be deleted. Just change it to:

if (ndup)
  {
    vtkDebugMacro(<< "vtkRemoveDuplicatePolys : " << ndup
                  << " duplicate polys (multiple instances of a polygon) have been"
                  << " removed." << endl);

    //polyPoints->Delete();
    output->Squeeze();
  }
  polyPoints->Delete();