This is the likely fix:

commit 56fd91fc830d7a210e3a0e70ab41261a1f5baa83
Author: Chris Wilson <[email protected]>
Date:   Mon Feb 25 15:18:46 2013 +0000

    sna/gen3+: Restart vertex space checks after lock contention
    
    If we end up contending for the vertex lock, we need to double check
    there is sufficient vertex space left for us.
    
    Bugzilla: 
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1124576

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https://bugs.launchpad.net/bugs/1124576

Title:
  Xorg crashed after feeding nbox=0 to trapezoid emit_boxes()

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