we are getting the following errors in Kamailio logs

kamailio.log

Jun 29 08:08:14 fep-1 /usr/local/fep-kamailio/sbin/kamailio[14111]: ERROR: [core/tcp_main.c:4451]: handle_tcpconn_ev(): io_watch_del(3) failed: for 0x7f524f7862d0, fd 30406
Jun 29 08:08:14 fep-1 /usr/local/fep-kamailio/sbin/kamailio[14111]: ERROR: [core/tcp_main.c:4451]: handle_tcpconn_ev(): io_watch_del(3) failed: for 0x7f525a6c5f90, fd 30407
Jun 29 08:08:14 fep-1 /usr/local/fep-kamailio/sbin/kamailio[14111]: ERROR: [core/tcp_main.c:4451]: handle_tcpconn_ev(): io_watch_del(3) failed: for 0x7f52449e0978, fd 30415

Jun 29 08:06:27 fep-1 /usr/local/fep-kamailio/sbin/kamailio[14111]: CRITICAL: [core/io_wait.h:596]: io_watch_del(): invalid fd 30355, not in [0, 4607)
Jun 29 08:06:27 fep-1 /usr/local/fep-kamailio/sbin/kamailio[14111]: CRITICAL: [core/io_wait.h:596]: io_watch_del(): invalid fd 30356, not in [0, 4607)
Jun 29 08:06:27 fep-1 /usr/local/fep-kamailio/sbin/kamailio[14111]: CRITICAL: [core/io_wait.h:596]: io_watch_del(): invalid fd 30358, not in [0, 4607)

Description

On checking this issue we found that Kamailio was not accepting TLS connections. We were getting an error which is mentioned above.

We double-checked TLS and TCP connections and they were normal. We have 5000+ TLS connections and the max connection limit is 30,000. So we were not exceeding the TLS connection limit.

We also verified open_files_limits. It is around 1 million which is more than enough.

Kamailio Version - output of kamailio -v

version: kamailio 5.4.2 (x86_64/linux) f8885c
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: f8885c

Operating System:

NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

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