How to get a backtrace in Cooja?

Hi Contiki gurus,

I'm just wondering here how to get a backtrace of a given mote when it
crash during a simulation. Because Cooja simply print a ''Array index out
of bounds" generic message when, for instance, I misuse a pointer in
Contiki. That way leaving me completely clueless as to where to look for
the bug.

Regards, Lucas Lira Gomes.