[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 #60 from Andrey Grodzovsky <andrey.grodzovsky at amd.com> ---
(In reply to dwagner from comment #58)
> Here comes another trace log, with your info2.patch applied.
> 
> Something must have changed since the last test, as it took pretty long this
> time to reproduce the crash. Could that have been caused by
> https://cgit.freedesktop.org/~agd5f/linux/commit/drivers/gpu/drm/amd/amdgpu/
> nbio_v7_4.c?h=amd-staging-drm-
> next&id=b385925f3922faca7435e50e31380bb2602fd6b8 now being part of the
> kernel?

Don't think it's related. This code is more related to virtualization.

> 
> However, the latest trace you find attached below is not much different to
> the last one, xzcat /tmp/gpu_debug5.txt.xz  | grep '^\[' will tell you:
> 
> [ 1510.023112] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring sdma0
> timeout, signaled seq=475104, emitted seq=475106
> [ 1510.023117] [drm] GPU recovery disabled.

That just means you are again running with GPU VM update mode set to use SDMA.
Which is seen in you dmesg (amdgpu.vm_update_mode=0) , so are again
experiencing the original issue of SDMA hang. Please use
amdgpu.vm_update_mode=3 to get back to VM_FAULTs issue.

> 
>      amdgpu_cs:0-806   [012] ....  1787.493126: amdgpu_vm_bo_cs:
> soffs=00001001a0, eoffs=00001001b9, flags=70
>      amdgpu_cs:0-806   [012] ....  1787.493127: amdgpu_vm_bo_cs:
> soffs=0000100200, eoffs=00001021e0, flags=70
>      amdgpu_cs:0-806   [012] ....  1787.493127: amdgpu_vm_bo_cs:
> soffs=0000102200, eoffs=00001041e0, flags=70
>      amdgpu_cs:0-806   [012] ....  1787.493129: amdgpu_vm_bo_cs:
> soffs=000010c1e0, eoffs=000010c2e1, flags=70
>      amdgpu_cs:0-806   [012] ....  1787.493131: drm_sched_job:
> entity=00000000406345a7, id=10239, fence=000000007a120377, ring=gfx, job
> count:8, hw job count:0
> 
> And later in the file you can find:
> ------------------------------------------------------
> crash detected!
> 
> executing umr -O halt_waves -wa
> No active waves!
> 
> executing umr -O verbose -R gfx[.]
> 
> polaris11.gfx.rptr == 512
> polaris11.gfx.wptr == 512
> polaris11.gfx.drv_wptr == 512
> polaris11.gfx.ring[ 481] == 0xffff1000    ... 
> polaris11.gfx.ring[ 482] == 0xffff1000    ... 
> polaris11.gfx.ring[ 483] == 0xffff1000    ... 
> polaris11.gfx.ring[ 484] == 0xffff1000    ... 
> polaris11.gfx.ring[ 485] == 0xffff1000    ... 
> polaris11.gfx.ring[ 486] == 0xffff1000    ... 
> polaris11.gfx.ring[ 487] == 0xffff1000    ... 
> polaris11.gfx.ring[ 488] == 0xffff1000    ... 
> polaris11.gfx.ring[ 489] == 0xffff1000    ... 
> polaris11.gfx.ring[ 490] == 0xffff1000    ... 
> polaris11.gfx.ring[ 491] == 0xffff1000    ... 
> polaris11.gfx.ring[ 492] == 0xffff1000    ... 
> polaris11.gfx.ring[ 493] == 0xffff1000    ... 
> polaris11.gfx.ring[ 494] == 0xffff1000    ... 
> polaris11.gfx.ring[ 495] == 0xffff1000    ... 
> polaris11.gfx.ring[ 496] == 0xffff1000    ... 
> polaris11.gfx.ring[ 497] == 0xffff1000    ... 
> polaris11.gfx.ring[ 498] == 0xffff1000    ... 
> polaris11.gfx.ring[ 499] == 0xffff1000    ... 
> polaris11.gfx.ring[ 500] == 0xffff1000    ... 
> polaris11.gfx.ring[ 501] == 0xffff1000    ... 
> polaris11.gfx.ring[ 502] == 0xffff1000    ... 
> polaris11.gfx.ring[ 503] == 0xffff1000    ... 
> polaris11.gfx.ring[ 504] == 0xffff1000    ... 
> polaris11.gfx.ring[ 505] == 0xffff1000    ... 
> polaris11.gfx.ring[ 506] == 0xffff1000    ... 
> polaris11.gfx.ring[ 507] == 0xffff1000    ... 
> polaris11.gfx.ring[ 508] == 0xffff1000    ... 
> polaris11.gfx.ring[ 509] == 0xffff1000    ... 
> polaris11.gfx.ring[ 510] == 0xffff1000    ... 
> polaris11.gfx.ring[ 511] == 0xffff1000    ... 
> polaris11.gfx.ring[ 512] == 0xc0032200    rwD 
> 
> 
> trying to get ADR from dmesg output for 'umr -O verbose -vm ...'
> trying to get VMID from dmesg output for 'umr -O verbose -vm ...'
> 
> done after crash.
> -------------------------------------------
> 
> So even without GPU reset, still no "waves". And the error message also does
> not state any VM fault address.

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