[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 #48 from dwagner <jb5sgc1n.nya at 20mm.eu> ---
(In reply to Andrey Grodzovsky from comment #47)
> Created attachment 141174 [details] [review]
> add_debug_info.patch
> 
> A am attaching a basic debug patch, please try to apply it.

Done.

> It should give a
> bit more info in dmesg whe VM fault happens. 

Hmm - I could not see any additional output resulting from it.

> 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

Did that - will attach the script "gpu_debug3.sh" and its output - this time,
dmesg and trace output are in the same file, if you want to look only at the
dmesg part, "grep '^\[' gpu_debug_3.txt" will get it. 

I reproduced the bug 4 times, on 2 occasions no error was emitted before
crashing, the 2 other times both umr commands could still run - since the error
message looked the same, I'll attach the shorter file, where the crash occurred
more quickly.

> Also check if adding amdgpu.vm_debug=1 makes the issue reproduce more quickly

I used that setting, but it did not seem to make a difference for how quickly
the crash occurred - still "some seconds to some minutes".

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