Description of problem:

I have a program that aborts with SIGABRT. I am changing the ulimit for core files like so:
ulimit -c unlimited
then running my program. The program aborts, but no core file is created.

How reproducible:

Every time.

Steps to Reproduce:
bash-4.0$ cat abort.c
#include <sys/signal.h>

int main(void)
{
        raise(SIGABRT);
        return 0;
}
bash-4.0$ gcc abort.c -o abort -g
bash-4.0$ ulimit -c unlimited
bash-4.0$ ./abort
Aborted (core dumped)
bash-4.0$ ls core*
ls: cannot access core*: No such file or directory
  
Actual results:

bash-4.0$ ls core*
ls: cannot access core*: No such file or directory

Expected results:

bash-4.0$ ls core*
core