miconda left a comment (kamailio/kamailio#4302)
I guess you still have the coredump, can you get the output with gdb for the next commands?
``` frame 4 print *param ```
The avp name seems to be set down in the trace (`eventapi_lock`), is it used like `$avp(eventapi_lock)` or via a variable as name (e.g., `$avp($var(name))`)?