$ gdb /usr/bin/echoping core.27236
GNU gdb (GDB) 8.2.1
...
Reading symbols from /usr/bin/echoping...(no debugging symbols found)...done.
[New LWP 27236]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Core was generated by `echoping -w 1 -P 0xa0 -p 6 -t 1 -6 -m /usr/lib/echoping/dns.so -n 20 facebook.c'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f73c938246a in init () from /usr/lib/echoping/dns.so