[exim-dev] segfault in delivery

2015-11-05 16:48:45 1ZuNXf-00009h-SD == example@???
R=xx_dnslookup T=transfoo defer (-1): smtp transport
process returned non-zero status 0x000b: terminated by signal 11

I'm getting about 1 in 100000 deliveries fail like this
and I have not figured out how to provoke it.
is there a way to get a core dump?

--
\_(ツ)_