On 20/09/16 10:54, Mahmood Naderan wrote: >> In these circumstances 'x/i $pc' may be your friend, it will just try to > > disassemble the exact instruction at the current PC. > > What does that mean? I didn't understand... Can you explain more? Which command should I use in order to catch the illegal instruction > It's a gdb command. Run it in the debugger after the program has stopped (or once you've loaded the core file). R.