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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #70 from Topi Pohjolainen <topi.pohjolainen at intel.com> ---
Even though the error is very random on SKL and I have a hard time narrowing it
down (i.e., simplify the piglit test itself), I see a pattern supporting the
"buffer overrun due to alignment violation"-theory. Every time I see a failure,
the corresponding texture update round reads the pixel-buffer-object until the
last line. I modified the test to use a region that don't require access to the
last four rows of the pixel buffer object. This seems to make the bug to
disappear.

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