The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /usr/bin/nautilus 
[Thread debugging using libthread_db enabled]
[New Thread 0x7f3dbb7b37f0 (LWP 17918)]
[New Thread 0x7f3daede0950 (LWP 17920)]
[New Thread 0x7f3dae5df950 (LWP 17921)]

Program exited normally.
(gdb)