### RTPEngine + RTIMER + SEGFAULT + unable to ping
When unable to ping RTPEngine instances kamailio crashes.
### Troubleshooting
Determined issue was related to the ping failures, resolved AWS SG issue,
allowing successful pings. Issue subsequently went away.
#### Reproduction
Use rtpengine with RDS backend
Load rtpengine with ~ 20 destinations you do not expect a response from on
Use rtimer to call rtpengine.reload via jsonrpcs:
```
modparam("rtimer", "timer", "name=rtpengine;interval=60;mode=0;")
modparam("rtimer", "exec", "timer=rtpengine;route=RELOAD_RTPENGINE")
route[RELOAD_RTPENGINE] {
xinfo("RTPEngine database reloading");
jsonrpc_exec('{"jsonrpc": "2.0", "method": "rtpengine.reload", "id": 1}');
}
```
#### Debugging Data
Got a core dump -- although I deleted quickly (not thinking) as they were
running instances out of disk quickly. bt full did not show much to step
through all though clearly pointed to rtpengine.
#### Log Messages
```
send_rtpp_command(): timeout waiting reply for command "ping" from RTPEngine
<udp:10.0.X.X>
```
### Possible Solutions
TBD / do not have ping failures under heavy load.
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
version: kamailio 5.8.2 (x86_64/linux)
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE,
USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, 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_BLOCKLIST, HAVE_RESOLV_RES,
TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_SEND_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 10.2.1
```
* **Operating System**:
```
uname -a
Linux 5.10.0-27-cloud-amd64 #1 SMP Debian 5.10.205-2 (2023-12-31) x86_64
GNU/Linux
cat /proc/version
Linux version 5.10.0-27-cloud-amd64 (debian-ker...@lists.debian.org) (gcc-10
(Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2) #1
SMP Debian 5.10.205-2 (2023-12-31)
lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 11 (bullseye)
Release: 11
Codename: bullseye
```
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