[SR-Users] Kamailio Stop Processing Call

[M Arqum CH]

Hello Members,
I have kamailio setup backed with mysql db, using db_cluster module for
spliting read and write..
Lisiting on three  different virtual ips are bind with same/single  udp port
*1* for processing  calls.
 One  static IP is bind with  udp port*2*  to for processing/response  to
option messages send from  keepalived external script  after every few
seconds and for DMQ messages from other kamailio node.

General configuation details:
children=16
fork=yes
listen=udp:VIP:SIP_PORT1
listen=udp:VIP2:SIP_PORT1
listen=udp:VIP3:SIP_PORT1
listen=udp:StaticIP3:SIP_PORT2
listen=tcp:SIP:RPC_PORT

SH_MEM=5012
PRIV_MEM=264

System Specification : 24 GB RAM, 12 CPUs

Sometimes kamailio  radomly stop processing the requests or give no
response on  new requests recevied on virtual ips and as well it did't show
any error in syslog.

To monitor the kamailio memory I used promethues (
https://github.com/florentchauveau/kamailio_exporter)

The moment kamailio stop processing the requests it also stop responding to
kamailio exporter and scrap request get timeout.  i.e error log on console
debian prometheus-kamailio-exporter[83440]: 2021/05/20 12:15:27 [error]
cannot read header: read unix @->/tmp/kamailio__ctl: i/o timeout


After getting first timeout occurrence of  kamailio-exporter scrap request,
kamailio processed sip messages for almost 30 seconds then completly stop
replying to any message.  But it keep replying to option message arrive on
different port from keepalived script.

Stats :
Active dialog: 75
Shared memory used: 150 MB

Kamailio Installed version :
kamailio -v
version: kamailio 5.4.1 (x86_64/linux) 2ca223
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, TLS_PTHREAD_MUTEX_SHARED
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: 2ca223
compiled on 12:51:24 Sep 21 2020 with gcc 6.3.0


Is anyone else face similar issue  or idea why kamailio is showing such
behaviour.?

Please guide me on what I should do to find and fix the issue.

Thanks
-- 
Regards
M Arqum
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