[Bug 109629] GPU hang on Haswell while encoding and decoding video

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109629

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
Looks like a userspace bug though; it doesn't match the expected typical error
for invalid TLB (due to a bad mm switch). Batch was submitted by vaapi, so
double check you've pulled the latest libva, and raise a bug with them (they
have historically forgotten to setup their SBA correctly and such
use-after-free bugs in their cmdbuffers...)

One other thing to double check kernel side is disabling iommu -- although the
error state doesn't indicate that to be a problem, just useful to rule out that
as a source of memory latency / incoherency / missed flushed|invalidate.

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