[Bug 103450] [BDW] dEQP-VK.synchronization.*read*_image*fence_fd are flaky

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103450

            Bug ID: 103450
           Summary: [BDW] dEQP-VK.synchronization.*read*_image*fence_fd
                    are flaky
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Vulkan/intel
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: siglesias at igalia.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org
                CC: jason at jlekstrand.net

Device: Mesa DRI Intel(R) HD Graphics 5500 (Broadwell GT2)  (0x1616)
Mesa HEAD: 767ca5bdf1 (master)
VK-GL-CTS HEAD: ab6b0ac1824ce0b091830042110cf3b3ea17e895 (master)

Command:

$ ./deqp-vk -n dEQP-VK.synchronization.*read*_image*fence_fd

How to reproduce it:

I run these in my updated Fedora GNOME 26 installation on my BDW laptop. The
easiest way to reproduce it is to run them in a terminal and lock/unlock my
GNOME session. Any time I do that, some tests fail. If I don't, they succeed.

Another easy way is to just run one of them in an infinite loop and repeat the
aforementioned steps:

$ while(true); do ./deqp-vk -n dEQP-VK.synchronization.*read*_image* | grep
"Passed" | grep -v "1/1" ; done

Also it is possible to reproduce it when executing a full cts run with piglit
with concurrency mode enabled using dylan's wip/deqp-group-at-a-time branch. In
that case, usually one or two tests fail.

Notes:

* There are no GPU hangs or any other kind of error in dmesg.
* These patches from Jason https://patchwork.freedesktop.org/series/31771/
(already landed in mesa master) improved the situation a lot, however it is
still possible to reproduce this bug.
* I was not able to reproduce it either on SKL or KBL.

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