https://bugs.freedesktop.org/show_bug.cgi?id=105251
--- Comment #79 from deltasquared ds2.bugs.freedesktop@gmail.com --- OK, have managed to get an unrelated crash from starting minetest now with the mentioned patch so at this point I think that case is unrelated. (Certainly seems to be more subtle, this MT crash has never been as reliable to trigger as some of the other things on this thread).
Will endeavour to file a bug separately. Any suggestions on information to kickstart such a related bug would be appreciated, else I will reach out to various channels on freenode first to get that ball rolling.