[...]
(gdb) break main                                                        # adăugăm breakpoint în funcția main
Breakpoint 1 at 0x400530: file bug.c, line 12.
(gdb) run                                                               # pornim programul
Starting program: /home/master/github/labs/ii/bug 

Breakpoint 1, main (argc=1, argv=0x7fffffffe038) at bug.c:12
12		char *bug = 0;
(gdb) next                                                              # trecem la următoarea linie din codul sursă
13		bug[2] = add(2, 4);
(gdb) next

Program received signal SIGSEGV, Segmentation fault.
0x000000000040054f in main (argc=1, argv=0x7fffffffe038) at bug.c:13
13		bug[2] = add(2, 4);
(gdb) run
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /home/master/github/labs/ii/bug 

Breakpoint 1, main (argc=1, argv=0x7fffffffe038) at bug.c:12
12		char *bug = 0;
(gdb) next
13		bug[2] = add(2, 4);
(gdb) step                                                              # intrăm în funcția add pentru a o analiza pas cu pas
add (a=2, b=4) at bug.c:6
6	    c = a + b;
(gdb) next
7	    return c;
(gdb) next
8	}
(gdb) next

Program received signal SIGSEGV, Segmentation fault.
0x000000000040054f in main (argc=1, argv=0x7fffffffe038) at bug.c:13
13		bug[2] = add(2, 4);
(gdb) quit
A debugging session is active.

	Inferior 1 [process 331] will be killed.

Quit anyway? (y or n) y