Probably the field `dst->send_sock` is no longer valid, it can confirmed by
getting:
```
frame 0
p *dst->send_sock
```
If the address is invalid, can be the case that the SIP transaction is
destroyed at same time due to a race.
I see you use dialog mode tracing - `d` mode:
```
# Only start sip_trace on initial INVITE
sip_trace("HEP_URL","$ci-MY_IP","d");
```
Which was not in 5.2.x, so it might be a bug of that feature. I haven't
implemented it, so I do not have proper insights at this moment, it will take
me some time to get into it. Meanwhile, if you still face crashes, maybe you
can switch to tracing using:
```
modparam("siptrace", "trace_mode", 1)
```
and:
```
event_route[siptrace:msg] {
if(!is_method("INVITE|ACK|BYE|CANCEL|PRACK|UPDATE")) {
drop();
}
}
```
as I understood that you want to do sip trace for traffic related to calls.
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