[Bug 102249] New: [CI][HSW] Unclaimed read from register 0x70008

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102249

            Bug ID: 102249
           Summary: [CI][HSW] Unclaimed read from register 0x70008
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: martin.peres at free.fr
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

The test igt at kms_busy@extended-modeset-hang-newfb-with-reset-render-C spewed
the following warning when running on haswell:

[  122.858359] Unclaimed read from register 0x70008
[  122.858387] ------------[ cut here ]------------
[  122.858407] WARNING: CPU: 5 PID: 63 at
drivers/gpu/drm/i915/intel_uncore.c:792 __unclaimed_reg_debug+0x47/0x60 [i915]
[  122.858409] Modules linked in: vgem snd_hda_codec_hdmi i915
x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul
snd_hda_codec_realtek snd_hda_codec_generic ghash_clmulni_intel snd_hda_intel
snd_hda_codec snd_hwdep snd_hda_core r8169 mei_me mii snd_pcm lpc_ich
prime_numbers mei
[  122.858476] CPU: 5 PID: 63 Comm: kworker/5:1 Tainted: G     U         
4.13.0-rc5-CI-CI_DRM_2968+ #1
[  122.858479] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12
02/15/2016
[  122.858501] Workqueue: events_long i915_hangcheck_elapsed [i915]
[  122.858506] task: ffff88040d1d0040 task.stack: ffffc90000254000
[  122.858528] RIP: 0010:__unclaimed_reg_debug+0x47/0x60 [i915]
[  122.858531] RSP: 0018:ffffc900002579d8 EFLAGS: 00010096
[  122.858536] RAX: 0000000000000024 RBX: 0000000000000000 RCX:
0000000000000002
[  122.858538] RDX: 0000000080000002 RSI: ffffffff81c9f973 RDI:
00000000ffffffff
[  122.858541] RBP: ffffc900002579f0 R08: 0000000000000000 R09:
0000000000000001
[  122.858543] R10: ffffc90000257968 R11: 0000000089e5bf7e R12:
0000000000070008
[  122.858545] R13: 0000000000000001 R14: 0000000000000000 R15:
ffff880400bd0ba0
[  122.858548] FS:  0000000000000000(0000) GS:ffff88041fb40000(0000)
knlGS:0000000000000000
[  122.858551] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  122.858553] CR2: 0000006149bc2200 CR3: 0000000003e0f000 CR4:
00000000001406e0
[  122.858555] Call Trace:
[  122.858578]  gen6_read32+0x22d/0x2b0 [i915]
[  122.858600]  ? fwtable_read8+0x2c0/0x2c0 [i915]
[  122.858617]  intel_modeset_setup_hw_state+0x786/0xe00 [i915]
[  122.858634]  __intel_display_resume+0x1f/0xd0 [i915]
[  122.858650]  intel_finish_reset+0xff/0x170 [i915]
[  122.858661]  i915_reset_device+0x205/0x260 [i915]
[  122.858673]  ? gen8_gt_irq_ack+0x170/0x170 [i915]
[  122.858678]  ? work_on_cpu_safe+0x60/0x60
[  122.858691]  i915_handle_error+0x2d8/0x430 [i915]
[  122.858695]  ? vsnprintf+0xd1/0x4b0
[  122.858699]  ? scnprintf+0x3a/0x70
[  122.858715]  hangcheck_declare_hang+0xd3/0xf0 [i915]
[  122.858728]  ? intel_runtime_pm_put+0x56/0xa0 [i915]
[  122.858745]  i915_hangcheck_elapsed+0x262/0x2d0 [i915]
[  122.858750]  process_one_work+0x224/0x650
[  122.858754]  worker_thread+0x4e/0x3b0
[  122.858757]  kthread+0x114/0x150
[  122.858759]  ? process_one_work+0x650/0x650
[  122.858761]  ? kthread_create_on_node+0x40/0x40
[  122.858763]  ? kthread_create_on_node+0x40/0x40
[  122.858765]  ret_from_fork+0x27/0x40
[  122.858770] Code: 01 75 31 84 db 75 2d 45 84 ed 48 c7 c0 35 ae 28 a0 48 c7
c6 2b ae 28 a0 48 0f 44 f0 44 89 e2 48 c7 c7 3e ae 28 a0 e8 ca 1f f2 e0 <0f> ff
83 2d 8c f5 0f 00 01 5b 41 5c 41 5d 5d c3 66 0f 1f 84 00 
[  122.858848] ---[ end trace 102ab81f8845a0ae ]---

Full results:
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_2968/shard-hsw4/igt@kms_busy@extended-modeset-hang-newfb-with-reset-render-C.html

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