--- /dev/null
+diff -Naur ParaView-5.9.0_ref/VTK/Filters/Geometry/vtkGeometryFilter.cxx ParaView-5.9.0/VTK/Filters/Geometry/vtkGeometryFilter.cxx
+--- ParaView-5.9.0_ref/VTK/Filters/Geometry/vtkGeometryFilter.cxx 2021-09-16 13:17:47.022010882 +0200
++++ ParaView-5.9.0/VTK/Filters/Geometry/vtkGeometryFilter.cxx 2021-09-16 13:21:51.054384099 +0200
+@@ -448,6 +448,71 @@
+ this->ICellIds.TakeReference(vtkIdList::New());
+ this->Coords.TakeReference(vtkPoints::New());
+ }
++
++ LocalDataType(const LocalDataType& other)
++ {
++ this->ThreadId = other.ThreadId;
++
++ this->Verts = other.Verts;
++ this->Lines = other.Lines;
++ this->Polys = other.Polys;
++ this->Strips = other.Strips;
++
++ this->VertsConnOffset = other.VertsConnOffset;
++ this->VertsOffset = other.VertsOffset;
++ this->LinesConnOffset = other.LinesConnOffset;
++ this->LinesOffset = other.LinesOffset;
++ this->PolysConnOffset = other.PolysConnOffset;
++ this->PolysOffset = other.PolysOffset;
++ this->StripsConnOffset = other.StripsConnOffset;
++ this->StripsOffset = other.StripsOffset;
++
++ this->PointMap = other.PointMap;
++ // These are here to have a different allocation for each threads
++ this->Cell.TakeReference(vtkGenericCell::New());
++ this->CellIds.TakeReference(vtkIdList::New());
++ this->IPts.TakeReference(vtkIdList::New());
++ this->ICellIds.TakeReference(vtkIdList::New());
++ this->Coords.TakeReference(vtkPoints::New());
++ }
++
++ LocalDataType& operator=(const LocalDataType& other)
++ {
++ if (this != &other)
++ {
++ LocalDataType tmp = LocalDataType(other);
++ this->Swap(tmp);
++ }
++ return *this;
++ }
++
++ void Swap(LocalDataType& other)
++ {
++ using std::swap; // the compiler will use custom swap for members if it exists
++
++ swap(this->Verts, other.Verts);
++ swap(this->Lines, other.Lines);
++ swap(this->Polys, other.Polys);
++ swap(this->Strips, other.Strips);
++
++ swap(this->VertsConnOffset, other.VertsConnOffset);
++ swap(this->VertsOffset, other.VertsOffset);
++ swap(this->LinesConnOffset, other.LinesConnOffset);
++ swap(this->LinesOffset, other.LinesOffset);
++ swap(this->PolysConnOffset, other.PolysConnOffset);
++ swap(this->PolysOffset, other.PolysOffset);
++ swap(this->StripsConnOffset, other.StripsConnOffset);
++ swap(this->StripsOffset, other.StripsOffset);
++
++ swap(this->PointMap, other.PointMap);
++ swap(this->Cell, other.Cell);
++ swap(this->CellIds, other.CellIds);
++ swap(this->IPts, other.IPts);
++ swap(this->ICellIds, other.ICellIds);
++ swap(this->Coords, other.Coords);
++ }
++
++
+
+ void SetPointMap(vtkIdType* ptMap)
+ {
