call corrupt(7)
The reason was that in one subroutine, a parameter value was stored in a local variable, then used for computation and restored at the end. Since constants was stored in read only memory when using g77 on Linux, but not on the f77 compiler on HPUX, the Linux port would crash, but not the original HPUX version. In that the code you had above would have worked.
I was going to mention Indiana but was more hoping that it wouldn't be mentioned at all.
program main
integer m,n
call corrupt(7)
write (*,*), 7
stop
end program main
subroutine corrupt (a)
integer a
a = 4
return
end