Why does strcpy() not working as expected i.e. overlap on Red Hat Enterprise Linux 6 x86_64 ?

Issue

• strcpy() does not work as expected on Red Hat Enterprise Linux 6 x86_64
• Here is an example:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

unsigned char s[200] = "1234567890";  
main()  
{  
    printf("\nOrig:%s\n",s);  
    strcpy(s,s+1);  
    printf("\nAfter:%s\n",s);  
}  

[root@zzz ~]# gcc test.c  
[root@zzz ~]# ./a.out
Orig: 1234567890  
After: 234567990

• This happens only on Red Hat Enterprise Linux 6 x86_64 and Fedora 16 x86_64, can not be reproduced on Red Hat Enterprise Linux 5 i386/x86_64 or Red Hat Enterprise Linux 6 i386 or 7 as well.