You have to locate the core file, it should be in / or in the folder the OS was configured to write core dumps (usually a file named core or core.7066 or something starting with core). Then get the backtrace from it with gdb:

gdb /path/to/kamailio /path/to/corefile
bt full

Add the output to this issue.

You are also running the master branch with version 4.3.0-pre0, at this moment the latest is 4.3.0-pre1, which includes some more fixes. Might be good to upgrade. Be aware that you may need to upgrade database schema, see:

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