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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