[Bug 73383] [IVB/HSW ppgtt bisected] When run nightly piglit testing causes X no responsive

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73383

--- Comment #14 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
I can reproduce this easily with 'GpuTest /test=plot3d'. Just run it and hit
'esc' -> boom.

I tried to analyze it a bit and I think what happens is something like this:

i915_vma_unbind(vma)
   ...
   i915_gem_object_finish_gpu()
       ...
           i915_vma_unbind(same_vma_here)
   <-------
   Oops. The current vma was freed already.

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