[Bug 91926] [SKL bisected] texsubimage pbo intermittent failures

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91926

--- Comment #41 from Topi Pohjolainen <topi.pohjolainen at intel.com> ---
Right, it still fails even when the faulty dimensions are rejected. The first
version I had for this just reduced the probability of faulty pixels appearing.

The test runs a loop of ten iterations during each it randomly selects the
dimensions. In the first version I simply skipped the iteration and therefore
the test tried fewer rectangles. I replaced the skip by a loop that keeps on
re-selecting dimensions until they are valid. Now the test really runs the ten
iterations and after 211 rounds of the test itself I got faulty pixels on IVB.
(This is based on the original form of the test).

The simplified version I have doesn't suffer from invalid dimensions as one of
the simplifications is hard-coded dimensions known to produce the faulty pixels
with high probability. Therefore I was skeptical of the connection between the
invalid dimensions (failing upload) and the pixels errors. Above confirms this.

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