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

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

--- Comment #57 from Andrey Grodzovsky <andrey.grodzovsky at amd.com> ---
(In reply to dwagner from comment #56)
> (In reply to Andrey Grodzovsky from comment #55)
> > > In above attached file "xz-compressed output of gpu_debug3.sh" there is umr
> > > output at the time of the crash (238 seconds after the reboot):
> > > 
> > > ----------------------------------------------
> > > ...
> > >           mpv/vo-897   [005] ....   235.191542: dma_fence_wait_start:
> > > driver=drm_sched timeline=gfx context=162 seqno=87
> > >           mpv/vo-897   [005] d...   235.191548: dma_fence_enable_signal:
> > > driver=drm_sched timeline=gfx context=162 seqno=87
> > >      kworker/0:2-92    [000] ....   238.275988: dma_fence_signaled:
> > > driver=amdgpu timeline=sdma1 context=11 seqno=210
> > >      kworker/0:2-92    [000] ....   238.276004: dma_fence_signaled:
> > > driver=amdgpu timeline=sdma1 context=11 seqno=211
> > > [  238.180634] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring sdma0
> > > timeout, signaled seq=32624, emitted seq=32626
> > > [  238.180641] amdgpu 0000:0a:00.0: GPU reset begin!
> > > [  238.180641] amdgpu 0000:0a:00.0: GPU reset begin!
> > > 
> > > crash detected!
> > > 
> > > executing umr -O halt_waves -wa
> > > No active waves!
> > 
> > Did you use amdgpu.vm_fault_stop=2 parameter ? In case a fault happened that
> > should have froze GPUs compute units and hence the above command would
> > produce a lot of wave info.
> 
> Yes I did, as can be seen from the kernel command line at the very beginning
> of the file I attached:
> [    0.000000] Command line: BOOT_IMAGE=/vmlinuz-linux_amd
> root=UUID=b5d56e15-18f3-4783-af84-bbff3bbff3ef rw
> cryptdevice=/dev/nvme0n1p2:root:allow-discards libata.force=1.5 video=DP-1:d
> video=DVI-D-1:d video=HDMI-A-1:1024x768 amdgpu.dc=1 amdgpu.vm_update_mode=0
> amdgpu.dpm=-1 amdgpu.ppfeaturemask=0xffffffff amdgpu.vm_fault_stop=2
> amdgpu.vm_debug=1
> 
> Could the "amdgpu 0000:0a:00.0: GPU reset begin!" message indicate a
> procedure that discards whatever has been in thoses "waves" before? If yes,
> could amdgpu.gpu_recovery=0 prevent that from happening?

Yes, missed that one. No resets.

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