Hi,
  Attached is a patch that seems to fix this; however it needs looking at by 
someone who understands the code; in particular I have some questions:

  1) Does this also need to go in cirRefreshArea8/16/24/32 ?
  2) Why is the generic one being called if there are those specialised ones 
anyway?
  3) Is there something that will clip a BoxRec rather than having to use my 
func?

This was tested on 1.5.1-0ubuntu2 on raring.

** Patch added: "Clip the range in cirRefreshArea"
   
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-cirrus/+bug/1043513/+attachment/3452921/+files/11-clip-refresh.patch

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https://bugs.launchpad.net/bugs/1043513

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

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