(In reply to Michel Dänzer from comment #7)
> (In reply to Mathieu Belanger from comment #6)
> > I might have the same bug
> > 
> > I does not append with Mesa git from mid august but a version from beginning
> > of September do it.
> 
> [...]
> 
> > Kernel 4.12
> 
> If that means amd-staging-4.12, you're probably running into bug 102500.

Yes, I did fix the one I wrote by switching the 4.13-rc5 (amd-staging-next, I
think)

Now I might have got similar to OP, "randomly" crash and the mouse was still
alive. After about 5 minutes X suicided and I was able to get the message log
and I saw a ton of:

[drm:amdgpu_gem_object_create [amdgpu]] *ERROR* Failed to allocate GEM object
(131072, 6, 131072, -12)

That bug was also not present with 4.12/mid august mesa.