Description of problem:
Editing a simple text file with vim gives me:

 Vim: Caught deadly signal SEGV

This seems to be related to the setting of the LANG environment variable

Version-Release number of selected component (if applicable):

6.2.253-2

How reproducible:

always

Steps to Reproduce:

1. (from tcsh)

2. setenv LANG en_US.C

3. run vi

4. notice output: Vim: Caught deadly signal SEGV

5. The only way to get a prompt bakc is to kill -9 the process
   from another shell.

Additional info:

I know the LANG setting is bogus but it should not crash programs
like this.
Resetting LANG back to something like en_US.UTF-8 resolves the problem.