GDB debugger hangs on Fortran 90 READ command when reading from a text file

Question

I compile the fortran files into an executable (sei.exe) using the following command.

gfortran -g -fno-align-commons -c Creat2.for Bessel.for Kei.for
gfortran -g -fno-align-commons *.o D12e.for -o sei.exe

I then use gdb debugger by typing

gdb sei

Then I type the following to run it with the text file input

run < input.inp

It starts running but then just hangs.

I type Ctrl-C to interrupt it, and then it gives me the following result Error

Line 408 is where it is at when I interrupt it, which is the line

READ (*,20) TITLE

Here is the code surrounding that line

      DO 1665 I=1, MAXTIT
         READ (*,20) TITLE
         IF (LEN_TRIM(TITLE) .EQ. 0)GOTO 1664
         READ (TITLE,FMT=30,ERR=1664)DUMY1, DUMY2, DUMY3, DUMY4,
 1                                   DUMY5, DUMY6, DUMY7, DUMY8

Any ideas how to stop it hanging, and make it debug with the file input? Thanks