Description

during sipp "tls caller and tls callee" test, do tls.reload repeatedly, the sipp tls connection will be disconnected and tls.reload will report error and can not be recovered

Troubleshooting

Reproduction

(1)write a simple request_route logic in kamailio.cfg, as follows:
request_route {
add_local_rport();
$du = "sip:192.168.131.190:1001;transport=tls";
forward();
}
(2)start sipp caller to kamailio tls:0.0.0.0:5061 and kamailio will relay this request to callee
(3)at the same time, in another console, run the following cmds:
((i = 0)); while true; do /opt/kamailio/sbin/kamcmd tls.reload && echo $i && ((i = i+1)); done;

Debugging Data

None

Log Messages

tls.reload will report the following error, and it can not work again until kamailio is restarted:
error: 500 - Error while loading TLS configuration file (consult server log)

at the same time, sipp tls connection is disconnected by kamailio, some error is shown in the kamailo.log:

Dec 14 10:59:54 localhost sipproxy[64723]: ERROR: tls [tls_server.c:1330]: tls_h_read_f(): protocol level error
Dec 14 10:59:54 localhost sipproxy[64723]: ERROR: tls [tls_server.c:1334]: tls_h_read_f(): src addr: 192.168.131.190:59545
Dec 14 10:59:54 localhost sipproxy[64723]: ERROR: tls [tls_server.c:1337]: tls_h_read_f(): dst addr: 192.168.131.190:5061
Dec 14 10:59:54 localhost sipproxy[64723]: ERROR: [core/tcp_read.c:1478]: tcp_read_req(): ERROR: tcp_read_req: error reading - c: 0x7f3f67c89ba8 r: 0x7f3f67c89cd0 (-1)

SIP Traffic

Possible Solutions

Additional Information

• Kamailio Version - output of kamailio -v

version: kamailio 5.6.2 (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, 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
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: unknown 
compiled on 10:03:56 Dec 14 2022 with gcc 4.9.4

• Operating System:

Linux localhost.localdomain 3.10.0-327.el7.x86_64 #1 SMP Thu Nov 19 22:10:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

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