[Bug 102322] System crashes after "[drm] IP block:gmc_v8_0 is hung!" / [drm] IP block:sdma_v3_0 is hung!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102322

--- Comment #47 from Andrey Grodzovsky <andrey.grodzovsky at amd.com> ---
Created attachment 141174
  --> https://bugs.freedesktop.org/attachment.cgi?id=141174&action=edit
add_debug_info.patch

A am attaching a basic debug patch, please try to apply it. It should give a
bit more info in dmesg whe VM fault happens. I wasn't able to test it on  my
system so it might be buggy or crash.

Reproduce again like before with the cmd-trace like before and once the fault
happens if possible try quickly run 

sudo umr -O halt_waves -wa

and only if you still have running system after that do the 
sudo umr -O verbose -R gfx[.]

The driver should be loaded amdgpu.vm_fault_stop=2 from grub
Also check if adding amdgpu.vm_debug=1 makes the issue reproduce more quickly

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