[Bug 107475] [iGVT-g][SKL] GPU Hang and iGVT-g guest crash under certain loads

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107475

--- Comment #3 from leozinho29_eu at hotmail.com ---
Created attachment 141537
  --> https://bugs.freedesktop.org/attachment.cgi?id=141537&action=edit
dmesg and card0/error

I built the kernel (using make localmodconfig it's doable), dmesg was pretty
peculiar, as when the guest window was focused messages stopped, and only
happened again when updating the driver in the VM (the error messages in
dmesg). Maybe this debug flag did not work as expected.

The guest had drivers version 24.20.100.6136 and I upgraded them to
24.20.100.6286 (the latest). When the installation was being made, that many
dmesg messages at 1614 seconds appeared and the screen froze for 15 seconds,
until the message at 1629 seconds, when it blinked and returned.

On reboot it seemed better than when I reported this bug but, once the example
workload was used, a GPU hang happened. Unlike before, it did not cause a blue
screen in the guest but the application that was being used crashed. It's not
good but it is less worse.

What dmesg does not show is that there were many small freezes in the guest
(framerate was 60 but then it fell to 7 and returned later, for example).

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