[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 #15 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #14)
> 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.

Right, this is somebody calling unbind() without holding their own reference.
So who called unbind()?

P.S. finish_gpu() doesn't call unbind() in my tree...

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