Hi, I just to try compile example from OProfile docs with strfry(char *) function. Seg fault occured when I run result program. Is there error of my system (Acer aspire 1520), or Debian etch for AMD64 platform? This is listing of program: #include <string.h> int main() { char string[ ] = "abcdefjh"; strfry(string); return 0; } Thanks, anyway.