### Description
Not sure, found 2 cores generated today, only suggesting it's DMQ related by what I see in the backtrace. They could have been generated during a restart of kamailio, not 100% sure though.
### Troubleshooting
TBD
#### Reproduction
TBD
#### Debugging Data
Attaching *bt full*, *info locals* and *list* from:
``` -rw------- 1 root kamailio 549019648 Jul 13 16:29 core.kamailio.22907.sbc01.1531517373 -rw------- 1 root kamailio 549019648 Jul 13 17:13 core.kamailio.777.sbc01.1531520031 ```
[core1__bt_full.txt](https://github.com/kamailio/kamailio/files/2194484/core1__bt_full.txt) [core1__info_locals.txt](https://github.com/kamailio/kamailio/files/2194485/core1__info_locals.txt) [core1__list.txt](https://github.com/kamailio/kamailio/files/2194486/core1__list.txt) [core2__bt_full.txt](https://github.com/kamailio/kamailio/files/2194487/core2__bt_full.txt) [core2__info_locals.txt](https://github.com/kamailio/kamailio/files/2194488/core2__info_locals.txt) [core2__list.txt](https://github.com/kamailio/kamailio/files/2194489/core2__list.txt)
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
``` root@sbc01:~# kamailio -V version: kamailio 5.1.4 (x86_64/linux) flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: unknown compiled with gcc 6.3.0 root@sbc01:~# ```
* **Operating System**:
``` root@sbc01:~# lsb_release -a No LSB modules are available. Distributor ID: Debian Description: Debian GNU/Linux 9.4 (stretch) Release: 9.4 Codename: stretch root@sbc01:~#
root@sbc01:~# uname -a Linux sbc01 4.9.0-6-amd64 #1 SMP Debian 4.9.88-1+deb9u1 (2018-05-07) x86_64 GNU/Linux root@sbc01:~# ```