igt@debugfs_test@read_all_entries - incomplete|igt@i915_suspend@debugfs-reader - BUG: kernel NULL pointer dereference, address: 0000000000000078, RIP: 0010:intel_hdcp_capable

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8949/fi-kbl-7560u/igt@debugfs_test@read_all_entries.html

<1> [18.871195] BUG: kernel NULL pointer dereference, address: 0000000000000078
<1> [18.871197] #PF: supervisor read access in kernel mode
<1> [18.871198] #PF: error_code(0x0000) - not-present page
<6> [18.871199] PGD 0 P4D 0 
<4> [18.871201] Oops: 0000 [#1] PREEMPT SMP PTI
<4> [18.871203] CPU: 2 PID: 911 Comm: debugfs_test Not tainted 5.9.0-rc3-CI-CI_DRM_8949+ #1
<4> [18.871205] Hardware name: Dell Inc. XPS 13 9360/0823VW, BIOS 2.9.0 07/09/2018
<4> [18.871270] RIP: 0010:intel_hdcp_capable+0x1e/0xc0 [i915]
<4> [18.871272] Code: 0c fd ff ff 0f 1f 84 00 00 00 00 00 48 83 ec 10 48 89 f8 65 48 8b 14 25 28 00 00 00 48 89 54 24 08 31 d2 48 8b 97 00 05 00 00 <8b> 4a 78 83 f9 0a 77 57 be 01 00 00 00 bf 00 00 00 00 48 d3 e6 f7
<4> [18.871273] RSP: 0018:ffffc90000ba3df0 EFLAGS: 00010246
<4> [18.871274] RAX: ffff8882659a9000 RBX: ffff8882659a9000 RCX: 000000000000000f
<4> [18.871275] RDX: 0000000000000000 RSI: ffff8882659a9000 RDI: ffff8882659a9000
<4> [18.871276] RBP: ffff8882624008e8 R08: 0000000000001000 R09: ffff88826d832000
<4> [18.871277] R10: ffffc90000ba3dc8 R11: ffff88826d831008 R12: ffffc90000ba3f10
<4> [18.871279] R13: 00000000ffffffff R14: 0000000000000001 R15: ffff8882624008e8
<4> [18.871280] FS:  00007fb239680e40(0000) GS:ffff888276500000(0000) knlGS:0000000000000000
<4> [18.871281] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [18.871282] CR2: 0000000000000078 CR3: 000000025f9ec002 CR4: 00000000003706e0
<4> [18.871283] Call Trace:
<4> [18.871312]  intel_hdcp_info+0x20/0xa0 [i915]
<4> [18.871336]  i915_hdcp_sink_capability_show+0x38/0x40 [i915]
<4> [18.871340]  seq_read+0xcb/0x420
<4> [18.871343]  full_proxy_read+0x51/0x80
<4> [18.871346]  vfs_read+0xb2/0x1c0
<4> [18.871348]  ksys_read+0xa2/0xe0
<4> [18.871351]  do_syscall_64+0x33/0x80
<4> [18.871353]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
<4> [18.871355] RIP: 0033:0x7fb238de134e
<4> [18.871357] Code: 00 00 00 00 48 8b 15 71 8c 20 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff c3 0f 1f 40 00 8b 05 ba d0 20 00 85 c0 75 16 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 5a f3 c3 0f 1f 84 00 00 00 00 00 41 54 55 49
<4> [18.871358] RSP: 002b:00007ffd170db518 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
<4> [18.871359] RAX: ffffffffffffffda RBX: 0000556d0f4dad60 RCX: 00007fb238de134e
<4> [18.871360] RDX: 0000000000000200 RSI: 00007ffd170db540 RDI: 000000000000000b
<4> [18.871361] RBP: 0000556d0ef8fc85 R08: 0000000000000000 R09: 000000000000002a
<4> [18.871362] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
<4> [18.871363] R13: 0000556d0f4dadfb R14: 000000000000000a R15: 000000000000000b
<4> [18.871366] Modules linked in: mei_hdcp snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio x86_pkg_temp_thermal coretemp crct10dif_pclmul crc32_pclmul snd_hda_intel snd_intel_dspcfg snd_hda_codec ghash_clmulni_intel snd_hwdep snd_hda_core cdc_ether snd_pcm usbnet mii mei_me mei intel_lpss_pci i2c_hid i915 btusb btrtl btbcm btintel pinctrl_sunrisepoint pinctrl_intel bluetooth ecdh_generic ecc prime_numbers
<4> [18.871379] CR2: 0000000000000078
<4> [18.871380] ---[ end trace a35eaff138f8006c ]---