It looks like a buffer overflow (writing more than allocating). What is the exact version you are running (kamailio -v)?

Before starting kamailio, run:

ulimit -c unlimited

Eventually run also kamailio as root in order to get the core file.

If you didn't configure one core file per process, do:

echo "1" > /proc/sys/kernel/core_uses_pid

Once you get core files, send the 'bt full' from gdb.

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