I was able to see this from core
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Core was generated by `/usr/local/kamailio-5.1/sbin/kamailio -P /var/run/kamailio/kamailio.pid -f /usr'. Program terminated with signal SIGABRT, Aborted. #0 0x00007f43f5c63428 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54 54 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.