[sr-dev] [kamailio/kamailio] coredumps possibly generated by DMQ in kamailio v5.1.4 (#1594)

[Joel Serrano]

### 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 at 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 at sbc01:~#
```

* **Operating System**:

```
root at 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 at sbc01:~#

root at 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 at sbc01:~#
```


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