https://bugs.freedesktop.org/show_bug.cgi?id=105684

--- Comment #15 from jian-hong@endlessm.com ---
Created attachment 138692
  --> https://bugs.freedesktop.org/attachment.cgi?id=138692&action=edit
tested with Linux kernel 4.16+ (commit
f8cf2f16a7c95acce497bfafa90e7c6d8397d653)

I have tried Linux kernel 4.16+ (commit
f8cf2f16a7c95acce497bfafa90e7c6d8397d653) and load amdgpu module manually.
The error becomes different: "system will hit the NULL pointer dereference at
0000000000000018" during loading amdgpu module.

[   26.715245] [drm] use_doorbell being set to: [true]
[   26.730536] [drm] Found VCN firmware Version: 1.45 Family ID: 18
[   26.894292] amdgpu: [powerplay] dpm has been enabled
[   26.896020] [drm] Display Core initialized with v3.1.38!
[   26.896269] BUG: unable to handle kernel NULL pointer dereference at
0000000000000018
[   26.896274] PGD 0 P4D 0 
[   26.896277] Oops: 0000 [#1] SMP NOPTI
[   26.896280] Modules linked in: amdkfd amd_iommu_v2 amdgpu(+) chash gpu_sched
ttm drm_kms_helper drm i2c_algo_bit fb_sys_fops syscopyarea sysfillrect
sysimgblt efi_pstore cmac bnep edac_mce_amd kvm_amd arc4 ccp kvm irqbypass
crct10dif_pclmul crc32_pclmul snd_hda_codec_realtek ghash_clmulni_intel
snd_hda_codec_generic btusb pcbc snd_hda_codec_hdmi input_leds snd_hda_intel
btrtl btbcm btintel bluetooth ecdh_generic snd_hda_codec aesni_intel
snd_hda_core ath10k_pci ath10k_core wmi_bmof snd_hwdep aes_x86_64 crypto_simd
cryptd r8169 glue_helper snd_pcm ath mac80211 sparse_keymap cfg80211 snd_timer
snd mii wmi soundcore psmouse shpchp i2c_piix4 mac_hid video zram ip_tables
x_tables hid_generic serio_raw uas ahci usb_storage libahci usbhid hid
[   26.896324] CPU: 5 PID: 752 Comm: modprobe Not tainted 4.16.0+ #10
[   26.896326] Hardware name: Acer Aspire TC-380/Aspire TC-380, BIOS D05
02/01/2018
[   26.896331] RIP: 0010:klist_node_init+0x1c/0x40
[   26.896333] RSP: 0018:ffffb89e823ef6e0 EFLAGS: 00010246
[   26.896335] RAX: ffff8bd9732e66f0 RBX: 0000000000000000 RCX:
000000000000121c
[   26.896337] RDX: 000000000000121b RSI: ffff8bd9732e66e8 RDI:
0000000000000000
[   26.896339] RBP: ffffb89e823ef6f8 R08: 00000000000271a0 R09:
00000000fffffffe
[   26.896341] R10: ffffee228fccbe00 R11: ffff8bd9732fa000 R12:
ffff8bd9732e66e8
[   26.896343] R13: 0000000000000000 R14: ffff8bd98795c000 R15:
ffff8bd98d4ef600
[   26.896346] FS:  00007f75665d7700(0000) GS:ffff8bd99ed40000(0000)
knlGS:0000000000000000
[   26.896348] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   26.896350] CR2: 0000000000000018 CR3: 00000003f7986000 CR4:
00000000003406e0
[   26.896352] Call Trace:
[   26.896355]  ? klist_add_tail+0x18/0x50
[   26.896360]  device_add+0x38d/0x640
[   26.896363]  device_create_groups_vargs+0xe0/0xf0
[   26.896366]  device_create_with_groups+0x3f/0x60
[   26.896370]  ? fb_get_options+0x26/0x180
[   26.896382]  drm_sysfs_connector_add+0x59/0xa0 [drm]
[   26.896392]  drm_connector_register.part.9+0x4b/0xb0 [drm]
[   26.896402]  drm_connector_register+0x1a/0x20 [drm]
[   26.896455]  dm_hw_init+0x854/0xe50 [amdgpu]
[   26.896491]  amdgpu_device_init+0x13c5/0x1490 [amdgpu]
[   26.896526]  amdgpu_driver_load_kms+0x8b/0x2c0 [amdgpu]
[   26.896535]  drm_dev_register+0x149/0x1e0 [drm]
[   26.896571]  amdgpu_pci_probe+0x13f/0x1f0 [amdgpu]
[   26.896574]  local_pci_probe+0x4a/0xa0
[   26.896577]  pci_device_probe+0x109/0x1b0
[   26.896580]  driver_probe_device+0x2bb/0x4a0
[   26.896582]  __driver_attach+0xe2/0xf0
[   26.896584]  ? driver_probe_device+0x4a0/0x4a0
[   26.896587]  bus_for_each_dev+0x6a/0xc0
[   26.896590]  ? kmem_cache_alloc_trace+0x1c4/0x1d0
[   26.896592]  driver_attach+0x1e/0x20
[   26.896594]  bus_add_driver+0x170/0x260
[   26.896596]  driver_register+0x60/0xe0
[   26.896599]  ? 0xffffffffc0c04000
[   26.896601]  __pci_register_driver+0x5a/0x60
[   26.896636]  amdgpu_init+0x7a/0x89 [amdgpu]
[   26.896639]  do_one_initcall+0x55/0x19d
[   26.896642]  ? __vunmap+0x81/0xb0
[   26.896644]  ? _cond_resched+0x1a/0x50
[   26.896646]  ? kmem_cache_alloc_trace+0xbb/0x1d0
[   26.896650]  ? do_init_module+0x27/0x219
[   26.896653]  do_init_module+0x5f/0x219
[   26.896655]  load_module+0x260e/0x2e10
[   26.896659]  SYSC_finit_module+0xe5/0x120
[   26.896662]  ? SYSC_finit_module+0xe5/0x120
[   26.896665]  SyS_finit_module+0xe/0x10
[   26.896667]  do_syscall_64+0x73/0x130

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