[Bug 91718] piglit.spec.arb_shader_image_load_store.invalid causes intermittent GPU HANG

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91718

--- Comment #7 from Mark Janes <mark.a.janes at intel.com> ---
OK, thanks for clarifying.  I only saw the
piglit.spec.arb_shader_image_load_store.invalid test hang on IVB.  I don't have
a way to audit historical results to understand which tests cause gpu hangs.

To find out which test is hanging, I have to take a machine out of the test
pool, boot it with i915.reset=0, and repeatedly run piglit until I get a hang. 
Then I can look in the test directory to see which tests were running at the
time.

If reset is enabled, then there is no information that I can use to figure out
which tests were running when the hang occurred.  For example,
arb_shader_image_load_store.invalid triggers the hang while reporting success.

IVB had the most common hangs, so I investigated that platform first.  BSW is
encountering hangs even with host-mem-barrier disabled, but I have to do some
investigation before I can tell you what test is the culprit.  I have no
information indicating it is from image_load_store.

I'll try to catch a hang on BSW tonight.

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