sem32 created an issue (kamailio/kamailio#4325)

Description

The issue: in 15 second after start of kamailio, it stops to read the UDP socket localhost:5060

Troubleshooting

Reproduction

Preconditions:

• More than one worker for UDP localhost:5060
• Kamailio receives SIP OPTION from the Asterisk by UDP localhost
• In the Kamailio's script we have a logic to send the SIP OPTION by TLS. We modify $ru and add to it ";transport=TLS"
• 25+ sip trunks which generates SIP OPTIONS with transport TLS
• all the trunks are resolvable but not reachable (don't listen the port)
• libssl3

Debugging Data

gdb_239054.txt
gdb_239053.txt

Possible Solutions

We have no issue in case we have:

• only one worker for UPD localhost and any version of libssl (libssl3 or libss1.1)
• or use libssl1.1 and any amount of workers

Additional Information

• Kamailio Version - output of kamailio -v

# kamailio -v
version: kamailio 5.8.6 (aarch64/linux) a14e49
flags: , EXTRA_DEBUGUSE_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-NOSMP, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES
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: a14e49
compiled on 14:10:21 Jul 15 2025 with gcc 12.2.0

• Operating System:

# lsb_release -a
No LSB modules are available.
Distributor ID:	Debian
Description:	Debian GNU/Linux 12 (bookworm)
Release:	12
Codename:	bookworm

# uname -a
Linux semen02 6.1.0-37-cloud-arm64 #1 SMP Debian 6.1.140-1 (2025-05-22) aarch64 GNU/Linux

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