### Description

Infiinite loop in siptrace module when configured to pure mirroring (no HEP) with core events.

#### Reproduction Simple config: listen=udp:XXX.XXX.XXX.XXX:5060 listen=udp:127.0.0.1:5080 debug=2

log_facility=LOG_LOCAL0 log_prefix="{$timef(%F %T) $mt $hdr(CSeq) $ci}"

children=4 loadmodule "tm.so" loadmodule "sl.so" loadmodule "pv.so" loadmodule "xlog.so" loadmodule "ctl.so"

loadmodule "siptrace.so" modparam("siptrace", "trace_on", 1) modparam("siptrace", "trace_mode", 4) modparam("siptrace", "trace_to_database", 0) modparam("siptrace", "xheaders_write", 1) modparam("siptrace", "duplicate_uri", "sip:127.0.0.1:5888") modparam("siptrace", "send_sock_addr", "sip:127.0.0.1:5080")

request_route { xinfo('>>>>> Request $rm from $si'); }

event_route[siptrace:msg] { xinfo(">>>>> Siptrace event method $rm"); }

#### Log Messages

With received OPTIONS request:

``` Feb 28 13:54:52 kamailio systemd[1]: Starting Kamailio - the Open Source SIP Server... Feb 28 13:54:52 kamailio kamailio: INFO: <core> [core/sctp_core.c:74]: sctp_core_check_support(): SCTP API not enabled - if you want to use it, load sctp module Feb 28 13:54:52 kamailio kamailio: INFO: <core> [core/tcp_main.c:4997]: init_tcp(): using epoll_lt as the io watch method (auto detected) Feb 28 13:54:52 kamailio kamailio[12246]: Listening on Feb 28 13:54:52 kamailio kamailio[12246]: udp: 2607:beef:be:beef:5054:ff:fe4b:dd25:5060 Feb 28 13:54:52 kamailio kamailio[12246]: udp: 127.0.0.1:5080 Feb 28 13:54:52 kamailio kamailio[12246]: Aliases: Feb 28 13:54:52 kamailio kamailio[12246]: udp: localhost:5080 Feb 28 13:54:52 kamailio kamailio[12246]: udp: kamailio:5060 Feb 28 13:54:52 kamailio /usr/sbin/kamailio[12259]: INFO: siptrace [siptrace.c:410]: mod_init(): can't load dlg api. Will not install dialog callbacks. Feb 28 13:54:52 kamailio /usr/sbin/kamailio[12259]: INFO: <core> [main.c:3030]: main(): processes (at least): 14 - shm size: 67108864 - pkg size: 8388608 Feb 28 13:54:52 kamailio /usr/sbin/kamailio[12259]: INFO: <core> [core/udp_server.c:154]: probe_max_receive_buffer(): SO_RCVBUF is initially 212992 Feb 28 13:54:52 kamailio /usr/sbin/kamailio[12259]: INFO: <core> [core/udp_server.c:206]: probe_max_receive_buffer(): SO_RCVBUF is finally 425984 Feb 28 13:54:52 kamailio /usr/sbin/kamailio[12259]: INFO: <core> [core/udp_server.c:154]: probe_max_receive_buffer(): SO_RCVBUF is initially 212992 Feb 28 13:54:52 kamailio /usr/sbin/kamailio[12259]: INFO: <core> [core/udp_server.c:206]: probe_max_receive_buffer(): SO_RCVBUF is finally 425984 Feb 28 13:54:52 kamailio /usr/sbin/kamailio[12273]: INFO: ctl [io_listener.c:214]: io_listen_loop(): io_listen_loop: using epoll_lt io watch method (config) Feb 28 13:54:52 kamailio systemd[1]: Started Kamailio - the Open Source SIP Server. Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12262]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12262]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12262]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12262]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12262]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12262]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12262]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12262]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12262]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12262]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:53 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS

...

Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12262]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12262]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12262]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12262]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12262]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12262]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12262]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12262]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12263]: INFO: <script>: >>>>> Siptrace event method OPTIONS Feb 28 13:54:54 kamailio kernel: [271505.656348] kamailio[12262]: segfault at 7ffdf9d8fff8 ip 00007f3bfeb6f256 sp 00007ffdf9d90000 error 6 in pv.so[7f3bfeaf3000+e0000] Feb 28 13:54:54 kamailio kernel: [271505.715015] kamailio[12263]: segfault at 7ffdf9d8fff8 ip 00007f3bfeb6f256 sp 00007ffdf9d90000 error 6 in pv.so[7f3bfeaf3000+e0000] Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12263]: message repeated 872 times: [ INFO: <script>: >>>>> Siptrace event method OPTIONS] Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12274]: CRITICAL: <core> [core/pass_fd.c:277]: receive_fd(): EOF on 9 Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12259]: ALERT: <core> [main.c:788]: handle_sigs(): child process 12262 exited by a signal 11 Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12259]: ALERT: <core> [main.c:791]: handle_sigs(): core was generated Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12259]: INFO: <core> [main.c:813]: handle_sigs(): terminating due to SIGCHLD Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12274]: INFO: <core> [main.c:868]: sig_usr(): signal 15 received Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12273]: INFO: <core> [main.c:868]: sig_usr(): signal 15 received Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12268]: INFO: <core> [main.c:868]: sig_usr(): signal 15 received Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12272]: INFO: <core> [main.c:868]: sig_usr(): signal 15 received Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12265]: INFO: <core> [main.c:868]: sig_usr(): signal 15 received Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12264]: INFO: <core> [main.c:868]: sig_usr(): signal 15 received Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12270]: INFO: <core> [main.c:868]: sig_usr(): signal 15 received Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12267]: INFO: <core> [main.c:868]: sig_usr(): signal 15 received Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12269]: INFO: <core> [main.c:868]: sig_usr(): signal 15 received Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12271]: INFO: <core> [main.c:868]: sig_usr(): signal 15 received Feb 28 13:54:54 kamailio /usr/sbin/kamailio[12266]: INFO: <core> [main.c:868]: sig_usr(): signal 15 received

```

### Additional Information

* **Kamailio Version** - output of `kamailio -v`

``` version: kamailio 5.5.3 (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, 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: unknown compiled with gcc 7.5.0 ```

* **Operating System**:

``` Ubuntu 18.04.6 LTS Linux 4.15.0-169-generic #177-Ubuntu SMP Thu Feb 3 10:50:38 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

```