Comment 41 for bug 1492037

I looked at the stuff Samuel found out and went to look at the libdrm git, where I found a couple of commits related to passing buffer alignment restrictions to the kernel, which I thought looked plausibly relevant to my layman eyes.

So I installed libdrm-git yesterday, and I haven't had a crash in almost two days.

It's hard to definitely say if it is fixed because of the spurious nature of the bug, but it looks good so far (if I'm not mistaken there could also be several reasons for the miptree to not be allocated, though, so it's not given that all crashes with this backtrace are related).