Can you try to generate the core dump file and attach here the backtrace from gdb?
To get the core, before running kamailio, do:
```
ulimit -c unlimited
```
Then start kamailio as root and reproduce the issue.
Having the backtrace will help to identify faster the exact part of the code crashing.
---
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https://github.com/kamailio/kamailio/issues/287#issuecomment-130234155