[sr-dev] [kamailio/kamailio] dispatcher: kamailio-devel segfaults on ping (#859)

[Timmo Verlaan]

The pinging from the dispatcher module segfaults and then kamailio exits. It used to work on kamailio 4.4.3.

*dispatcher.list*
```
31 sip:10.0.20.191:5062;transport=udp 8 0 socket=udp:10.0.20.193:5021
```

*debug logging*
```
21(2188) DEBUG: dispatcher [dispatch.c:2872]: ds_ping_set(): probing set #31, URI sip:10.0.20.191:5062;transport=udp
21(2188) DEBUG: <core> [socket_info.c:559]: grep_sock_info(): checking if host==us: 11==11 && [10.0.20.193] == [10.0.20.193]
21(2188) DEBUG: <core> [socket_info.c:566]: grep_sock_info(): checking if port 5021 (advertise 0) matches port 5021
21(2188) DEBUG: tm [uac.c:411]: t_uac_prepare(): DEBUG:tm:t_uac: next_hop=<sip:10.0.20.191:5062;transport=udp>
21(2188) DEBUG: tm [uac.c:152]: dlg2hash(): DEBUG: dlg2hash: 37511
21(2188) DEBUG: tm [uac.c:616]: send_prepared_request_impl(): send_prepared_request_impl: uac: 0x7ff37f776380  branch: 0  to 10.0.20.191:5062
0(2167) ALERT: <core> [main.c:743]: handle_sigs(): child process 2188 exited by a signal 11
0(2167) INFO: <core> [main.c:759]: handle_sigs(): terminating due to SIGCHLD
```

Please let me know if you need more information.

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