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

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

--- Comment #20 from dwagner jb5sgc1n.nya@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?