inserire un approfondimento su libbacktrace

 - https://stackoverflow.com/questions/105659/how-can-one-grab-a-stack-trace-in-c
 - https://stackoverflow.com/questions/18679567/alternative-to-backtrace-on-linux-that-can-find-symbols-for-static-functions
 - https://github.com/ianlancetaylor/libbacktrace
 - https://github.com/ErwanLegrand/libbacktrace/blob/master/examples/bt.c