The log messages indicate that a core file was generated:
``` May 3 20:18:20 lwm-PowerEdge-R720 /usr/local/sbin/kamailio[46694]: ALERT: [main.c:727]: handle_sigs(): child process 46727 exited by a signal 11 May 3 20:18:20 lwm-PowerEdge-R720 /usr/local/sbin/kamailio[46694]: ALERT: [main.c:730]: handle_sigs(): core was generated ```
Can you locate it and get the output of `bt full` from `gdb` investigating the core? The corefile may be either in `/` (root folder), the runtime directory for kamailio or a special folder configured in the OS for dumping the core files.