It is known not to work with libssl, they removed some features from libssl that are needed by Kamailio (iirc, custom memory management).
Are those crashes by a kamailio with tls module still loaded, or not?
For the core of the first backtrace in the previous comment, can you get the output of the gdb commands:
``` frame 17 info locals list p tcp_children ```
I see you use lldb, not that familiar with, that's why I gave the gdb commands, probably you can find the equivalent of them.