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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #68 from Topi Pohjolainen <topi.pohjolainen at intel.com> ---
I had earlier verified that in a failing run the source texture had correct
pixel values in it (by dumping on the disk). I hadn't been able to verify that
the same applies for the source texture after update round (with 200 test
rounds I just couldn't get it to fail). I had left my laptop running it for
10000 rounds and I actually got a failing round with a dump (7101 test rounds
where needed). Only problem is that as there are two internal iterations and it
is always the second failing, I actually have total garbage for both on the
disk. I can't readily explain this - it maybe that I'm missing a flush before
the dump. I used "src/mesa/main/debug.c::write_ppm()".

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