[Bug 105684] Loading amdgpu hits general protection fault: 0000 [#1] SMP NOPTI

[bugzilla-daemon at freedesktop.org]

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

--- Comment #33 from Paul Menzel <pmenzel+bugs.freedesktop at molgen.mpg.de> ---
With Linux 4.18-rc5+ and merged drm-tip, the general protection fault happens
at a different point from `initialize_plane`.

```
15.389: [   24.739453] [drm] Display Core initialized with v3.1.52!
15.389: [   24.746057] general protection fault: 0000 [#1] SMP NOPTI
15.390: [   24.751824] CPU: 0 PID: 370 Comm: systemd-udevd Tainted: G        W 
       4.18.0-rc5+ #2
15.390: [   24.751825] Hardware name: MSI MS-7A37/B350M MORTAR (MS-7A37), BIOS
1.G1 05/17/2018
15.391: [   24.751829] RIP: 0010:prefetch_freepointer+0x10/0x20
15.391: [   24.774361] Code: 89 d3 e8 c3 53 4b 00 85 c0 0f 85 71 78 00 00 48 83
c4 08 5b 5d 41 5c 41 5d c3 0f 1f 44 00 00 48 85 f6 74 13 8b 47 20 48 01 c6 <48>
33 36 48 33 b7 38 01 00 00 0f 18 0e c3 66 90 0f 1f 44 00 00 48 
15.393: [   24.794677] RSP: 0018:ffffa31f0259f900 EFLAGS: 00010202
15.393: [   24.794678] RAX: 0000000000000000 RBX: 18b43346a3036634 RCX:
00000000000007fc
15.394: [   24.794678] RDX: 00000000000007fb RSI: 18b43346a3036634 RDI:
ffff97d5de406e80
15.394: [   24.794680] RBP: ffff97d5ca9b3400 R08: ffff97d5de824f00 R09:
ffffffffb273adb0
15.395: [   24.823335] R10: ffffffffb273adac R11: 0000000000000007 R12:
00000000006080c0
15.395: [   24.823335] R13: ffff97d5de406e80 R14: 0000000000000290 R15:
ffff97d5de406e80
15.396: [   24.823336] FS:  00007fd442ec88c0(0000) GS:ffff97d5de800000(0000)
knlGS:0000000000000000
15.396: [   24.823338] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
15.397: [   24.853319] CR2: 00007fd34c0034c8 CR3: 0000000403e6c000 CR4:
00000000003406f0
15.397: [   24.853320] Call Trace:
15.397: [   24.853323]  kmem_cache_alloc_trace+0xb5/0x1f0
15.398: [   24.868339]  ? initialize_plane+0x27/0x97 [amdgpu]
15.398: [   24.868380]  initialize_plane+0x27/0x97 [amdgpu]
15.399: [   24.878524]  amdgpu_dm_initialize_drm_device+0x149/0xb34 [amdgpu]
[…]
```

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