[Bug 98638] Panic on shutdown with AMDGPU and Ubuntu Plymouth

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98638

--- Comment #6 from Ernst Sjöstrand <ernstp at gmail.com> ---
Here's a new "backtrace"...
null pointer dereference in amdgpu_fence_wait_empty can't be that many
things...
Is it the rcu_dereference?

https://cgit.freedesktop.org/~agd5f/linux/tree/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c?h=drm-next-4.10-wip#n261

[   85.216191] [drm] amdgpu: finishing device.
[   86.336739] Console: switching to colour VGA+ 80x25
[   86.345463] BUG: unable to handle kernel NULL pointer dereference at        
  (null)
[   86.345477] IP: [<ffffffffc03882ba>] amdgpu_fence_wait_empty+0x2a/0xd0
[amdgpu]
[   86.345508] PGD 0 [   86.345510] 
[   86.345516] Oops: 0000 [#1] SMP
[   86.345519] Modules linked in: netconsole configfs binfmt_misc eeepc_wmi
asus_wmi sparse_keymap video intel_rapl x86_pkg_temp_thermal kvm_intel kvm
irqbypass input_leds btusb btrtl btbcm crct10dif_pclmul crc32_pclmul btintel
ghash_clmulni_intel bluetooth aesni_intel aes_x86_64 snd_hda_codec_realtek lrw
glue_helper ablk_helper snd_hda_codec_generic cryptd snd_hda_codec_hdmi
intel_cstate snd_hda_intel intel_rapl_perf snd_hda_codec snd_hda_core serio_raw
snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq
snd_seq_device snd_timer snd mei_me soundcore mei lpc_ich shpchp mac_hid sbs
sbshc max6650 coretemp parport_pc ppdev lp parport ip_tables x_tables autofs4
btrfs xor raid6_pq hid_generic usbhid hid amdkfd amd_iommu_v2 mxm_wmi amdgpu
i2c_algo_bit ttm drm_kms_helper syscopyarea sysfillrect ahci sysimgblt
fb_sys_fops libahci e1000e83 ec 08 23 87 88 00 00 00 48 8b 97 90 00 00 00 48 8d
04 c2 18 48 85 db 74 6f 8b 0b 85 c9 74 69 8d 51 01 89 c8 f0 0f 
[   86.346049] RIP  [<ffffffffc03882ba>] amdgpu_fence_wait_empty+0x2a/0xd0
[amdgpu]
[   86.346071]  RSP <ffffa46a017f3af0>
[   86.346073] CR2: 0000000000000000

I only see the backtrace when amdgpu is unloaded before my ethernet module,
which seems to be rare.
Would be nice to force the ethernet driver to be unloaded last.

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