Fatal error (11)Segmentation fault when trying to enter gdb mode in emacs, what's wrong?

[thinkee365]

What does the following segmentation fault mean?

Fatal error (11)Segmentation fault
What is a segmentation fault, and what can cause it to happen?

The issue arrises once I type, Mx gdb into Emacs,


the scenerio is descirbed as the following picture shows:
a) input command to enter gdb mode
http://i1271.photobucket.com/albums/jj624/bigmeowOoO/before-enter-gdb-mode.jpg

b) press Enter to enter gdb mode, then error appears
http://i1271.photobucket.com/albums/jj624/bigmeowOoO/after-i-press-enter.jpg


more details:

[a]: i build emacs 24.1 on centos 5.3 from source, this build cannot enter gdb 
mode

[b]: also i build emacs 24.1 on debian 5.0, it can use gdb mode without error

so i really don't know what happened that i cannot use gdb mode in emacs 24.1 
on centos 5.3:(