Well several things
1) Since you are running the KDE and other GUI which itself eats up 256 core ram and how much swap you got? Kernel kills the process if it won’t found much RAM+SWAP in order to avoid the instability

2) How much swap space you got?

3) Did you got any core file created in directory?

4) Can you run program without GUI in run level 3?

5) I hope your program is not buggy? If it is buggy especially using pointers then it could be blocked because of SELinux (Security-Enhanced Linux) FC kernel. It includes Discretionary access control (DAC) and Mandatory access control (MAC). The later closely controls user and process interactions with the system, and can provide protection from broken software or malware So try to disable SELinux termporary and then run the program different ways exist first method is type following at shell prompt as root
and run the program
Second method is disabled it all tougher and reboot the system
1) Open the file /etc/sysconfig/selinux
2) And setup look for SELINUX and set value to disabled
3) Reboot linux
Caution you should always backup the system before playing with SELinux especially if you are a new

See NSA SELinux main website — http://www.nsa.gov/selinux/
SELinux community page — http://selinux.sourceforge.net

Hope this help also if possible paste your code here