[Bug 88641] [snb 3.17] ringbuffer wrap overshoot? batchbuffer incoherence?

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88641

--- Comment #7 from Chris Wilson <chris at chris-wilson.co.uk> ---
Both of those errors have inconsistent values in the batch vs being read by the
GPU (what I call incoherence). Looks like you have a reasonable method of
reproducing.

I think this most likely a kernel issue, and I would start investigating with
different kernel versions.

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