asterisk users - Dec 2015 - asterisk 11.20.0 segfaults, but no core dump produced

Hello,

I've had several occurences of asterisk segfault (exited on signal 11), but
no core dump produced.

asterisk workdir is /tmp, /tmp is world-writeable and asterisk was started as
"asterisk -f -I  -vvv -g"

What else am I missing? Is there situations where core dump isn't produced?
Any way to avoid it?

Thanks,

Michael
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