Weird emacs segmentation fault

[address@hidden]

I'm running GNU Emacs 24.2.1 on a FreeBSD 9.1 system. When I try to edit any 
file with an f90 extension (like pgm.f90) in a particular subdirectory 
(/home/user/myself/programs/201312) emacs crashes with a Segmentation fault.  
If the same file is edited in emacs in any other subdirectory, there is no 
problem. Also, if I simply move that file to another file with any extension 
such as .py or .c or even with no extension, emacs works with it fine.  This is 
really, really weird. It must have something to do with emacs trying to go 
FORTRAN mode in that subdirectory.

Any thoughts or pointers?