[Bug 107945] System crashes seconds after a GPU hang with kernel newer than 4.18

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107945

--- Comment #9 from leozinho29_eu at hotmail.com ---
As I was helped on Launchpad on how to address a regression I was facing and
all Mesa issues I had were solved (thank you), I am being able to use kernel
version newer than 4.17.19.

I installed 4.19-rc6 today and I noticed some important details which I believe
they may be helpful to share.

Using the system normally (office, web browser, mail client), even without
triggering a GPU hang or really heavy loads, makes the system have problems as
this system crash but for a very brief time.

Basically, the step:

2) A task with significant video load is closed (watching a video and then
closing the media player window, for example)

Makes the system have a very brief crash-like situation sometimes, where the
sound loop once and then the system continues normally.

I've noticed events like that today 7 times already. The last one happened when
I opened GNOME Software, a few minutes ago.

It's important to say that there is absolutely nothing that can be seen when
that happens, as there is no screen corruption or anything wrong in the screen.
The only way possible to notice those tiny freezes is if there is sound
playing, because the sound loop.

Which leads to a interesting thing: whatever causes the system crash is
happening often but without a GPU hang there is no crash. It may be possible to
get information about this tiny freeze that, only after a GPU hang, causes a
system crash.

Which debug options should be used to try to get useful information, if any?

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