Unfortunately, the best I can do is this:

Core was generated by `/usr/sbin/kamailio -f /etc/kamailio/kamailio.cfg -P /var/run/kamailio/kamailio.'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007fa3e65a5f3b in ?? () from /usr/lib/x86_64-linux-gnu/kamailio/modules/usrloc.so
(gdb) #0  0x00007fa3e65a5f3b in ?? () from /usr/lib/x86_64-linux-gnu/kamailio/modules/usrloc.so
#1  0x00007fa3e659a2b8 in mem_timer_udomain () from /usr/lib/x86_64-linux-gnu/kamailio/modules/usrloc.so
#2  0x00007fa3e658bec6 in synchronize_all_udomains () from /usr/lib/x86_64-linux-gnu/kamailio/modules/usrloc.so
#3  0x00007fa3e65a465a in ?? () from /usr/lib/x86_64-linux-gnu/kamailio/modules/usrloc.so
#4  0x000000000054d517 in ?? ()
#5  0x0000000000552aa2 in slow_timer_main ()
#6  0x000000000047df69 in main_loop ()
#7  0x000000000041bcd1 in main ()