Things also became better with the Cirrus driver and VMs. After being able to 
login I noticed that my KVM VM (which runs on a rather power efficient, iow not 
too fast, machine) still has occasional crashes of this type. And there you can 
see (and have to wait) every graphical "goodness" like fading in and out or 
docking. While the host I run the Xen VM (which uses the  same cirrus 
emulation) runs rather smoothly (because it has more CPU power) and I think I 
did not see any crash, yet.
That somehow leads me to believe this could be a problem (in the cirrus case) 
of the communication between X driver, llvm-pipe and the emulated card being 
overrun in some way.
Not sure how this relates to the nouveau case. I would not think the X driver 
could be too fast for the 3D pipe in hardware. But maybe this gives X driver 
people a hint.

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which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1043513

Title:
  Xorg crashed with SIGABRT in memcpy() via cirRefreshArea() under KVM
  virtual machine

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