[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 #20 from dwagner <jb5sgc1n.nya at 20mm.eu> ---
(In reply to Andrey Grodzovsky from comment #19)
> No need to recompile, just need to see what is the content of SDMA ring
> buffer when the hang occurs.
> 
> Clone and build our register analyzer from here -
> https://cgit.freedesktop.org/amd/umr/ and once the hang happens just run 
> 
> sudo umr -lb
> sudo umr -R gfx[.]
> sudo umr -R sdma0[.]
> sudo umr -R sdma1[.]
> 
> I will probably need more info later but let's try this first.

How can I run "umr" on a crashed system? I guess those register values are
retained over a press of the reset button / reboot?

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