Apologies for being late to reply.
Having run mesa built from the MR branch, I have since been unable to get the
same crash when running minetest.
Certainly the apitrace capture can no longer bring my system down, however the
actual program running was always less determistic than that, so it was hard to
prove the absence of - that said, I have been playing the game again for a few
days now and have not experienced the crash, so I feel reasonably comfortable
it has gone.