[sr-dev] [kamailio/kamailio] Private memory leaking in case of topos(redis) and topoh modules enable together (#1682)

[alexey-khabulyak]

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### Description

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I tested kamailio's topoh+topos modules. udp worker's private memory is leaking when i enable both.  
after a couple of hour kamailio stops and spams error messages.

### Troubleshooting
kamcmd pkg.stats shows lots of real_used memory(only udp workers are leaking).

#### Reproduction
Enable both modules.
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#### Debugging Data

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#### Log Messages

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```
Oct 18 17:00:55  /usr/sbin/kamailio[20801]: ERROR: <core> [core/receive.c:162]: receive_msg(): no mem for sip_msg
Oct 18 17:00:55  /usr/sbin/kamailio[20802]: ERROR: <core> [core/mem/q_malloc.c:291]: qm_find_free(): qm_find_free(0x7fe6f5bee010, 1776); Free fragment not found!
Oct 18 17:00:55  /usr/sbin/kamailio[20802]: ERROR: <core> [core/mem/q_malloc.c:425]: qm_malloc(): qm_malloc(0x7fe6f5bee010, 1776) called from core: core/receive.c: receive_msg(160), module: core; Free fragment not found!
```


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### Possible Solutions

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disable one of modules
### Additional Information
* **/etc/default/kamailio** 
```
SHM_MEMORY=512
PKG_MEMORY=64
```
Number of children = 8

* **Parameters**:
```
loadmodule "topoh.so"
modparam("topoh", "mask_key", "N2hkVvBTxJ6Y")
modparam("topoh", "mask_callid", 0)
modparam("topoh", "sanity_checks", 1)
modparam("topoh", "uri_prefix_checks", 1)
modparam("topoh", "mask_ip", MY_IP_ADDR)
loadmodule "topos.so"
loadmodule "topos_redis.so"
modparam("topos", "storage", "redis")
modparam("topos", "branch_expire", 300)
modparam("topos", "dialog_expire", 10800)
modparam("topos", "clean_interval", 30)
modparam("topos_redis", "serverid", "topo")
```
  * **Kamailio Version** - output of `kamailio -v`

```
# kamailio -v
version: kamailio 5.1.6 (x86_64/linux) 
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, 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_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 4.9.2
```

* **Operating System**:

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Kernel details (output of `uname -a`)
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```
Debian 8.10
```


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