Hello,

please try to produce a coredump and then get a backtrace, e.g. as described here: https://www.kamailio.org/wikidocs/tutorials/troubleshooting/coredumpfile/

Does it happened only once so far, or frequently?

Cheers,

Henning

From: Сергей Приймак via sr-users <sr-users@lists.kamailio.org>
Sent: Dienstag, 17. März 2026 13:09
To: Benoit Panizzon via sr-users <sr-users@lists.kamailio.org>
Cc: Сергей Приймак <serg99sb@gmail.com>
Subject: [SR-Users] segfault error 6 in tm.so

Dear All,

kindly asking to have a look at following error. When I use event_route in a way like below:

event_route[dispatcher:dst-down] {

  xlog("Destination down: $rm $rd \n");

  if(is_in_subnet($rd, "192.168.131.0/24")) {

    if(ds_select_dst("1", "0")) {

      xlog("L_ERR", "Next available destination: $dd\n");

      t_newtran();

      http_async_query("http://192.168.131.21:8080/recovercall.cgi?oldip=$rd&newip=$dd", "HTTP_REPLY");

    }

  }

}

in case some destination is down, I experiencing following problem:

2026-03-17T13:24:53.778421+02:00 kam1 /usr/local/sbin/kamailio[2102]: ERROR: <script>: Destination down: OPTIONS 192.168.131.20

2026-03-17T13:24:53.779095+02:00 kam1 kernel: kamailio[2102]: segfault at 678 ip 00007f5eb5395d06 sp 00007fff26462980 error 6 in tm.so[112d06,7f5eb5290000+127000] likely on CPU 1 (core 1, socket 0)

2026-03-17T13:24:53.779138+02:00 kam1 kernel: Code: 8b 05 4e 32 05 00 89 10 b8 ff ff ff ff e9 d6 1a 00 00 48 8b 45 c8 48 8b 80 f0 00 00 00 48 8b 95 48 ff ff ff 8b 92 78 06 00 00 <89> 90 78 06 00 00 e8 80 56 f5 ff 85 c0 0f 89 69 03 00 00 48 8b 05

2026-03-17T13:24:53.780890+02:00 kam1 /usr/local/sbin/kamailio[2102]: ERROR: <script>: Next available destination: 192.168.131.21

2026-03-17T13:24:53.781758+02:00 kam1 /usr/local/sbin/kamailio[2102]: INFO: tm [t_lookup.c:1886]: t_newtran(): attempt to create transaction for a faked request - try to avoid it

2026-03-17T13:24:53.782445+02:00 kam1 /usr/local/sbin/kamailio[2102]: NOTICE: tm [tm.c:1748]: w_t_newtran(): transaction already in process 0x7f5eb6a550f0

2026-03-17T13:24:53.836181+02:00 kam1 /usr/local/sbin/kamailio[2127]: CRITICAL: <core> [core/pass_fd.c:284]: receive_fd(): EOF on 78

2026-03-17T13:24:53.837291+02:00 kam1 /usr/local/sbin/kamailio[2053]: ALERT: <core> [main.c:815]: handle_sigs(): child process 2102 exited by a signal 11

2026-03-17T13:24:53.837625+02:00 kam1 /usr/local/sbin/kamailio[2053]: ALERT: <core> [main.c:819]: handle_sigs(): core was not generated

2026-03-17T13:24:53.837829+02:00 kam1 /usr/local/sbin/kamailio[2053]: INFO: <core> [main.c:842]: handle_sigs(): terminating due to SIGCHLD

Kamailio version 6.1.1