Bug 111320

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_5125/fi-skl-6600u/igt@i915_selftest@live_sanitycheck.html

<6> [353.164473] Console: switching to colour dummy device 80x25
<6> [353.164533] [IGT] i915_selftest: executing
<7> [353.255683] [drm:intel_power_well_enable [i915]] enabling power well 2
<7> [353.263726] [drm:i915_audio_component_get_eld [i915]] Not valid for port B
<7> [353.263795] [drm:i915_audio_component_get_eld [i915]] Not valid for port B
<7> [353.263852] [drm:i915_audio_component_get_eld [i915]] Not valid for port B
<7> [353.263907] [drm:i915_audio_component_get_eld [i915]] Not valid for port C
<7> [353.263962] [drm:i915_audio_component_get_eld [i915]] Not valid for port C
<7> [353.264016] [drm:i915_audio_component_get_eld [i915]] Not valid for port C
<7> [353.264070] [drm:i915_audio_component_get_eld [i915]] Not valid for port D
<7> [353.264125] [drm:i915_audio_component_get_eld [i915]] Not valid for port D
<7> [353.264179] [drm:i915_audio_component_get_eld [i915]] Not valid for port D
<1> [353.264330] BUG: kernel NULL pointer dereference, address: 0000000000000629
<1> [353.264335] #PF: supervisor read access in kernel mode
<1> [353.264337] #PF: error_code(0x0000) - not-present page
<6> [353.264339] PGD 0 P4D 0 
<4> [353.264343] Oops: 0000 [#1] PREEMPT SMP PTI
<4> [353.264346] CPU: 1 PID: 303 Comm: kworker/1:3 Tainted: G     U            5.3.0-rc3-CI-CI_DRM_6642+ #1
<4> [353.264348] Hardware name: Dell Inc. XPS 13 9350/, BIOS 1.4.12 11/30/2016
<4> [353.264354] Workqueue: events snd_hdac_bus_process_unsol_events [snd_hda_core]
<4> [353.264359] RIP: 0010:hdmi_unsol_event+0x7/0x120 [snd_hda_codec_hdmi]
<4> [353.264362] Code: 0f b7 d6 48 c7 c6 a0 00 58 a0 5d 41 5c 41 5d e9 81 d6 10 e1 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 8b 87 48 06 00 00 <80> b8 29 06 00 00 00 74 02 f3 c3 41 54 41 89 f4 55 53 41 c1 ec 1a
<4> [353.264364] RSP: 0018:ffffc900001d7e50 EFLAGS: 00010286
<4> [353.264367] RAX: 0000000000000000 RBX: ffff88826b5d8308 RCX: 0000000000000004
<4> [353.264370] RDX: ffffffffa01e3050 RSI: 00000000ffffffff RDI: ffff88825e890008
<4> [353.264374] RBP: ffffc900001d7ec8 R08: 0000000000000000 R09: 0000000000000001
<4> [353.264379] R10: 00000000ccfc04a0 R11: 00000000ed522ae8 R12: ffff888275ab9900
<4> [353.264383] R13: ffff888275abdc00 R14: 0000000000000000 R15: 0000000000000000
<4> [353.264387] FS:  0000000000000000(0000) GS:ffff888275a80000(0000) knlGS:0000000000000000
<4> [353.264389] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [353.264391] CR2: 0000000000000629 CR3: 0000000251db8001 CR4: 00000000003606e0
<4> [353.264393] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
<4> [353.264395] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
<4> [353.264397] Call Trace:
<4> [353.264402]  snd_hdac_bus_process_unsol_events+0x5a/0x70 [snd_hda_core]
<4> [353.264408]  process_one_work+0x245/0x610
<4> [353.264416]  worker_thread+0x37/0x380
<4> [353.264420]  ? process_one_work+0x610/0x610
<4> [353.264423]  kthread+0x119/0x130
<4> [353.264427]  ? kthread_park+0xa0/0xa0
<4> [353.264433]  ret_from_fork+0x3a/0x50
<4> [353.264439] Modules linked in: snd_hda_intel i915 amdgpu gpu_sched ttm vgem snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic mei_hdcp x86_pkg_temp_thermal coretemp snd_intel_nhlt snd_hda_codec snd_hwdep snd_hda_core crct10dif_pclmul crc32_pclmul snd_pcm ghash_clmulni_intel asix usbnet mii mei_me mei prime_numbers i2c_hid btusb btrtl btbcm btintel bluetooth pinctrl_sunrisepoint pinctrl_intel ecdh_generic ecc [last unloaded: i915]
<0> [353.264462] Dumping ftrace buffer:
<0> [353.264464] ---------------------------------