[sr-dev] [kamailio/kamailio] kamcmd ul.dump -> error: 500 - Internal error creating aor struct (#2412)

[marcinkowalczyk]

### Description

Hi,
I'm running some tests on top of Kamailio 5.3.5 (x86_64/linux) 9e70e8  on CentOS with ~1.2k registered endpoints. While I try to dump registered contacts it fails: 
```
[root at v0p1356-dispatcher kamailio]# kamcmd ul.dump
error: 500 - Internal error creating aor struct
[root at v0p1356-dispatcher kamailio]# kamcmd ul.db_contacts location
1172
[root at v0p1356-dispatcher kamailio]#
```

### Troubleshooting

I'm running kamailio with -m 512 -M 128 and like suggested in #1513 I've tuned ctl module settings but no luck
```
modparam("ctl", "binrpc_buffer_size", 4096)
modparam("ctl", "binrpc_max_body_size", 16)

```

#### Reproduction

send >1000 registrations 

#### Log Messages

```
Jul 28 15:12:13 localhost /usr/sbin/kamailio[55179]: ERROR: ctl [binrpc_run.c:1094]: rpc_struct_add(): failed to add attribute-value ({)
```

### Additional Information

```
[root at v0p1356-dispatcher kamailio]# kamailio  -v
version: kamailio 5.3.5 (x86_64/linux) 9e70e8
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, 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: 9e70e8
compiled on 14:35:46 Jun 22 2020 with gcc 4.8.5
[root at v0p1356-dispatcher kamailio]#

```

* **Operating System**:

```
  Operating System: CentOS Linux 7 (Core)
       CPE OS Name: cpe:/o:centos:centos:7
            Kernel: Linux 3.10.0-1127.el7.x86_64
      Architecture: x86-64
```


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