[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 #4 from leozinho29_eu at hotmail.com ---
Created attachment 141583
  --> https://bugs.freedesktop.org/attachment.cgi?id=141583&action=edit
netconsole

I was writing an answer when the system froze. The notebook is frozen right
now, I am writing this from my desktop. The desktop is the receiving the
netconsole messages.

I set the debug options in the kernel build (I still did not test with the boot
option intel_iommu=igfx_off) and set the reboot on panic. The notebook needed
more than 10 minutes to freeze this time, but the reboot on panic did not work,
as it's frozen for a few minutes already (I set in sysctl.conf kernel.panic =
5.

I think I found a pattern of the system crash. 

1) A GPU hang must happen (for example, the hangs caused by Vulkan);
2) A task with significant video load is closed (watching a video and then
closing the media player window, for example);
3) When the focus of the window is changed, the system crashes.

It's important to say that with 4.17.19, after the hang I can open and close
demanding tasks with no issues.

I have attached the netconsole, which seems to not have relevant data again. I
will try the boot option later, at least it seems I found some pattern now.

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