DLGLOBAL DEBUG curr_fn=0 + RFN=0 -> FN=0
DLGLOBAL DEBUG curr_fn=0 + RFN=4 -> FN=4
DLGLOBAL DEBUG curr_fn=4953 + RFN=4961 -> FN=4961
DLGLOBAL DEBUG curr_fn=2229729 + RFN=23322 -> FN=2229786
DLGLOBAL DEBUG curr_fn=2229777 + RFN=23322 -> FN=2229786
DLGLOBAL DEBUG curr_fn=1320458 + RFN=5070 -> FN=1320462