igt@gem_eio@kms - incomplete - Unclaimed read from register .*
https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_435/fi-bxt-dsi/igt@gem_eio@kms.html#dmesg-warnings362
<4> [133.481261] i915 0000:00:02.0: Unclaimed read from register 0x72084
<4> [133.481419] WARNING: CPU: 1 PID: 1190 at drivers/gpu/drm/i915/intel_uncore.c:1166 __unclaimed_reg_debug+0x69/0x80 [i915]
<4> [133.481426] Modules linked in: vgem mei_hdcp x86_pkg_temp_thermal snd_hda_codec_hdmi coretemp crct10dif_pclmul snd_hda_codec_realtek snd_hda_codec_generic crc32_pclmul ghash_clmulni_intel lpc_ich i915 btusb btrtl btbcm btintel bluetooth snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hwdep snd_hda_core ecdh_generic ecc snd_pcm igb mei_me ptp mei pps_core prime_numbers intel_lpss_pci i2c_hid pinctrl_broxton pinctrl_intel
<4> [133.481472] CPU: 1 PID: 1190 Comm: gem_eio Tainted: G U 5.6.0-rc1-g865945b07668-drmtip_435+ #1
<4> [133.481477] Hardware name: Intel Corp. Broxton P/Apollolake RVP1A, BIOS APLKRVPA.X64.0150.B11.1608081044 08/08/2016
<4> [133.481582] RIP: 0010:__unclaimed_reg_debug+0x69/0x80 [i915]
<4> [133.481588] Code: 48 8b 78 18 48 8b 5f 50 48 85 db 74 2d e8 5f fe 11 f0 45 89 e8 48 89 e9 48 89 da 48 89 c6 48 c7 c7 58 b1 79 c0 e8 f7 1f af ef <0f> 0b 83 2d 0e 5d 2c 00 01 5b 5d 41 5c 41 5d c3 48 8b 1f eb ce 66
<4> [133.481593] RSP: 0018:ffff9f1fc0a0bbb0 EFLAGS: 00010086
<4> [133.481598] RAX: 0000000000000000 RBX: ffff8ee17a3a15a0 RCX: 0000000000000003
<4> [133.481602] RDX: 0000000080000003 RSI: 0000000000000000 RDI: 00000000ffffffff
<4> [133.481607] RBP: ffffffffc07dd824 R08: 0000000000000000 R09: 0000000000000001
<4> [133.481611] R10: 000000006230a88f R11: 0000000015330890 R12: 0000000000000001
<4> [133.481615] R13: 0000000000072084 R14: 0000000000000000 R15: 0000000000000206
<4> [133.481620] FS: 00007ff18dfe9e40(0000) GS:ffff8ee17bc80000(0000) knlGS:0000000000000000
<4> [133.481625] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [133.481629] CR2: 000055f596522000 CR3: 0000000172ab4000 CR4: 00000000003406e0
<4> [133.481633] Call Trace:
<4> [133.481724] fwtable_read32+0x18f/0x200 [i915]
<4> [133.481833] intel_display_capture_error_state+0x19c/0x5f0 [i915]
<4> [133.481942] i915_gpu_coredump+0x1d0/0x340 [i915]
<4> [133.482049] i915_capture_error_state+0xa/0x60 [i915]
<4> [133.482143] intel_gt_handle_error+0x34d/0x3e0 [i915]
<4> [133.482262] i915_wedged_set+0x5b/0xc0 [i915]
<4> [133.482273] ? simple_strtoull+0x3b/0x70
<4> [133.482285] simple_attr_write+0xb0/0xd0
<4> [133.482298] full_proxy_write+0x51/0x80
<4> [133.482309] vfs_write+0xb9/0x1d0
<4> [133.482319] ksys_write+0x9f/0xe0
<4> [133.482331] do_syscall_64+0x4f/0x240
<4> [133.482340] entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4> [133.482346] RIP: 0033:0x7ff18d33d281
<4> [133.482352] Code: c3 0f 1f 84 00 00 00 00 00 48 8b 05 59 8d 20 00 c3 0f 1f 84 00 00 00 00 00 8b 05 8a d1 20 00 85 c0 75 16 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 57 f3 c3 0f 1f 44 00 00 41 54 55 49 89 d4 53
<4> [133.482356] RSP: 002b:00007ffec622a3a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
<4> [133.482362] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff18d33d281
<4> [133.482366] RDX: 0000000000000002 RSI: 000055f5962d007d RDI: 000000000000004c
<4> [133.482370] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000034
<4> [133.482375] R10: 0000000000000000 R11: 0000000000000246 R12: 000055f5962d007d
<4> [133.482379] R13: 000000000000004c R14: 00007ffec622a440 R15: 00007ffec622a6f0
<4> [133.482402] irq event stamp: 154396
<4> [133.482408] hardirqs last enabled at (154395): [<ffffffffb0a6132f>] _raw_spin_unlock_irq+0x1f/0x40
<4> [133.482414] hardirqs last disabled at (154396): [<ffffffffb0a6111d>] _raw_spin_lock_irqsave+0xd/0x50
<4> [133.482419] softirqs last enabled at (154372): [<ffffffffb0e00385>] __do_softirq+0x385/0x47f
<4> [133.482426] softirqs last disabled at (154365): [<ffffffffb00c09aa>] irq_exit+0xba/0xc0
<4> [133.482430] ---[ end trace 73590cb17b14f1f8 ]---
<7> [133.483391] i915 0000:00:02.0: [drm:i915_fifo_underrun_reset_write [i915]] Re-arming FIFO underruns on pipe A