I just found a pretty minimized test case for a coredump recipe:
pelix> pike -t2 -e '' /pike/home/marcus/Pike/7.3/src/object.c:577: Fatal error: Couldn't load master object. No stack - no backtrace. zsh: IOT instruction (core dumped) pike -t2 -e
-t1 works like a charm, though. :)