### Description
Try to fill carrierroute with routing data and test result with `kamcmd`, but the rpc
command never gives a result.
### Troubleshooting
#### Reproduction
```
/* ----- ctl params -------------------------------------------------------- */
modparam("ctl", "binrpc",
"unix:/var/run/kamailio/kamailio_ctl")
modparam("ctl", "mode", 0660)
/* ----- carrierroute params ----------------------------------------------- */
modparam("carrierroute", "config_source", "db")
modparam("carrierroute", "db_url", "EXTERN_READ_DBURL")
modparam("carrierroute", "fetch_rows", 2000)
modparam("carrierroute", "db_load_description", 1)
modparam("carrierroute", "match_mode", 10)
modparam("carrierroute", "avoid_failed_destinations", 1)
```
Kamailio is running with the following parameters:
```
/usr/local/sbin/kamailio -u kamailio -g kamailio -m 512 -M 20 -n 16
```
Fill carrierroute table with 110 Routes, do a routes reload and than try to get the routes
dumped.
`kamcmd cr.reload_routes` and after that issue `kamcmd cr.dump_routes`, which hangs and
don't return a result.
#### Log Messages
```
nothing regarding carrierroute in the log
```
### Possible Solutions
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### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
version: kamailio 5.1.0-dev8 (x86_64/freebsd)
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, 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, select, kqueue.
id: unknown
compiled on 20:35:54 Nov 1 2017 with clang 4.0
```
* **Operating System**:
<!--
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CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `uname -a`)
-->
```
FreeBSD 11.1-RELEASE
```
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