Created attachment 228972 [details] core dump from fossil --version, packed with zip -9. A few weeks ago, Fossil (then 2.16) has stopped working properly: While "fossil all rebuild" works just fine, "fossil git export" throws a core dump - and so does "fossil --version". I attached fossil.core from "fossil --version". It's 2.17,2 now, but the update did not solve a thing.
Can you try with a more recent version?