Hi Daniel,
here is the output:
``` GNU gdb (Debian 10.1-1.7) 10.1.90.20210103-git Copyright (C) 2021 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: https://www.gnu.org/software/gdb/bugs/. Find the GDB manual and other documentation resources online at: http://www.gnu.org/software/gdb/documentation/.
For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from /usr/sbin/kamailio... Reading symbols from /usr/lib/debug/.build-id/56/b8c9f5a3c31e6a1813f0c59adb02c922c60137.debug...
warning: Can't open file /dev/zero (deleted) during file-backed mapping note processing [New LWP 53605] [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Core was generated by `/usr/sbin/kamailio -P /run/kamailio/kamailio.pid -f /etc/kamailio/csbc.cfg -m 5'. Program terminated with signal SIGSEGV, Segmentation fault. #0 0x00007fd49cf02f72 in usrloc_dmq_send_multi_contact (ptr=0x7fd49d8f6ea0, aor=..., action=1, node=0x7fd49d84f5f8) at usrloc_sync.c:685 685 usrloc_sync.c: No such file or directory. (gdb) frame 0 #0 0x00007fd49cf02f72 in usrloc_dmq_send_multi_contact (ptr=0x7fd49d8f6ea0, aor=..., action=1, node=0x7fd49d84f5f8) at usrloc_sync.c:685 685 in usrloc_sync.c (gdb) p *ptr $1 = {domain = 0x7fd49d5b32d8, ruid = {s = 0x7fd49d8f7240 "uloc-3-6326536b-abf4-663", len = 24}, aor = 0x7fd49d8e86b8, c = {s = 0x7fd49d8f7000 "sip:1070500@192.168.1.201;transport=UDP;user=phone", len = 50}, received = {s = 0x7fd49d8f71c0 "sip:45.225.71.102:5060", len = 22}, path = {s = 0x0, len = 0}, expires = 1663464479, q = -1, callid = {s = 0x7fd49d8f70a0 "45776c982344d3e367a0325e7fafb494@192.168.1.201", len = 46}, cseq = 2146305210, state = CS_SYNC, flags = 0, cflags = 12, user_agent = {s = 0x7fd49d8f7138 "OXO032/043.001 GW_032/043.001", len = 29}, uniq = {s = 0x0, len = 0}, sock = 0x0, last_modified = 1663460879, last_keepalive = 1663462640, ka_roundtrip = 0, methods = 7823, instance = {s = 0x0, len = 0}, reg_id = 0, server_id = 3, tcpconn_id = -1, keepalive = 1, xavp = 0x0, next = 0x7fd49d96d2c0, prev = 0x0} (gdb) p ptr->sock $2 = (struct socket_info *) 0x0 (gdb) p *ptr->sock Cannot access memory at address 0x0 (gdb) ```