[Bug 89932] New: [SKL]igt/kms_flip/absolute-wf_vblank sporadically causes WARNING: CPU: 2 PID: 0 at drivers/gpu/drm/i915/intel_display.c:10177 intel_check_page_flip+0xa6/0xc1 [i915](

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89932

            Bug ID: 89932
           Summary: [SKL]igt/kms_flip/absolute-wf_vblank sporadically
                    causes WARNING: CPU: 2 PID: 0 at
                    drivers/gpu/drm/i915/intel_display.c:10177
                    intel_check_page_flip+0xa6/0xc1 [i915](
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 114907
  --> https://bugs.freedesktop.org/attachment.cgi?id=114907&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure

Non-working platforms: SKL

==kernel==
--------------------------
drm-intel-nightly/333cf6eed7cae0ee2d6bb1b4c4d421b94f84fc13
commit 333cf6eed7cae0ee2d6bb1b4c4d421b94f84fc13
Author: Jani Nikula <jani.nikula at intel.com>
Date:   Thu Apr 2 11:38:12 2015 +0300

    drm-intel-nightly: 2015y-04m-02d-08h-37m-57s UTC integration manifest

==Bug detailed description==
-----------------------------
Run 3 rounds, it happens 1 round.
kms_flip at flip-vs-modeset-vs-hang-interruptible 
kms_flip at flip-vs-panning-vs-hang-interruptible
kms_flip at vblank-vs-hang-interruptible
kms_flip at wf_vblank

output:
IGT-Version: 1.10-g43a1f64 (x86_64) (Linux:
4.0.0-rc6_drm-intel-nightly_333cf6_20150403+ x86_64)
Using monotonic timestamps
Beginning absolute-wf_vblank on crtc 20, connector 34
  3200x1800 60 3200 3248 3280 3316 1800 1802 1807 1816 0xa 0x48 361310
............................................................
absolute-wf_vblank on crtc 20, connector 34: PASSED

Beginning absolute-wf_vblank on crtc 25, connector 34
  3200x1800 60 3200 3248 3280 3316 1800 1802 1807 1816 0xa 0x48 361310
.............................................................
absolute-wf_vblank on crtc 25, connector 34: PASSED

Beginning absolute-wf_vblank on crtc 30, connector 34
  3200x1800 60 3200 3248 3280 3316 1800 1802 1807 1816 0xa 0x48 361310
.............................................................
absolute-wf_vblank on crtc 30, connector 34: PASSED

Subtest absolute-wf_vblank: SUCCESS (34.163s)

[   45.191531] WARNING: CPU: 2 PID: 0 at
drivers/gpu/drm/i915/intel_display.c:10177 intel_check_page_flip+0xa6/0xc1
[i915]()
[   45.191536] Kicking stuck page flip: queued at 1, now 5
[   45.191539] Modules linked in: dm_mod snd_hda_codec_realtek
snd_hda_codec_generic ppdev snd_hda_intel snd_hda_controller snd_hda_codec
snd_hda_core snd_hwdep pcspkr snd_pcm s
nd_timer snd soundcore i2c_i801 wmi battery parport_pc parport ac acpi_cpufreq
i915 button video drm_kms_helper drm
[   45.191576] CPU: 2 PID: 0 Comm: swapper/2 Not tainted
4.0.0-rc6_drm-intel-nightly_333cf6_20150403+ #196
[   45.191580] Hardware name: Intel Corporation Skylake Client platform/Skylake
Y LPDDR3 RVP3, BIOS SKLSE2R1.86C.B067.R00.1412310711 12/31/2014
[   45.191584]  0000000000000000 0000000000000009 ffffffff817950c6
ffff88014e483e18
[   45.191591]  ffffffff8103bcf8 ffff88014427c9a0 ffffffffa00d44f1
0000000000000002
[   45.191596]  ffff88014427c800 ffff88009baed000 0000000000000001
0000000000000001
[   45.191602] Call Trace:
[   45.191606]  <IRQ>  [<ffffffff817950c6>] ? dump_stack+0x40/0x50
[   45.191626]  [<ffffffff8103bcf8>] ? warn_slowpath_common+0x98/0xb0
[   45.191659]  [<ffffffffa00d44f1>] ? intel_check_page_flip+0xa6/0xc1 [i915]
[   45.191667]  [<ffffffff8103bd55>] ? warn_slowpath_fmt+0x45/0x4a
[   45.191703]  [<ffffffffa00c4b2d>] ? __intel_pageflip_stall_check+0xaf/0xd8
[i915]
[   45.191734]  [<ffffffffa00d44f1>] ? intel_check_page_flip+0xa6/0xc1 [i915]
[   45.191771]  [<ffffffffa00ab610>] ? gen8_irq_handler+0x1fb/0x345 [i915]
[   45.191778]  [<ffffffff81071d29>] ? handle_irq_event_percpu+0x34/0x15b
[   45.191784]  [<ffffffff81081f22>] ? update_wall_time+0x524/0x53d
[   45.191790]  [<ffffffff81071e7e>] ? handle_irq_event+0x2e/0x4c
[   45.191796]  [<ffffffff810743c7>] ? handle_edge_irq+0xba/0xcf
[   45.191802]  [<ffffffff810042f8>] ? handle_irq+0x15/0x1d
[   45.191808]  [<ffffffff81003dbc>] ? do_IRQ+0x41/0xc0
[   45.191814]  [<ffffffff8179b42a>] ? common_interrupt+0x6a/0x6a
[   45.191816]  <EOI>  [<ffffffff816aded8>] ? cpuidle_enter_state+0x71/0x11e
[   45.191869]  [<ffffffff816adebc>] ? cpuidle_enter_state+0x55/0x11e
[   45.191879]  [<ffffffff81065324>] ? cpu_startup_entry+0x1f7/0x34d
[   45.191884] ---[ end trace abc623aeca530d81 ]---


==Reproduce steps==
---------------------------- 
1. dmesg -r|egrep "<[1-4]>"|grep drm

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