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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