[Bug 77297] [i965 bisected]CallTrace: WARNING: CPU: 0 PID: 1335 at drivers/gpu/drm/i915/intel_display.c:768 intel_wait_for_vblank+0x159/0x17c [i915]() while running kms_flip_absolute-wf_vblank

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77297

--- Comment #20 from Guo Jinxian <jinxianx.guo at intel.com> ---
This failure is able to reproduce on ILK on latest
-fixes(2a592bec50994597716c633191ed6bf7af14defc) while running tests below:
igt/kms_cursor_crc/cursor-128-onscreen
igt/kms_cursor_crc/cursor-256-onscreen
igt/kms_cursor_crc/cursor-64-onscreen
igt/kms_cursor_crc/cursor-size-change


[root at x-e6510 tests]# ./kms_cursor_crc --run-subtest cursor-size-change
IGT-Version: 1.7-gf473a55 (i686) (Linux:
3.17.0-rc2_drm-intel-fixes_2a592b_20140902+ i686)
Beginning cursor-size-change on pipe A, connector eDP-1

cursor-size-change on pipe A, connector eDP-1: PASSED

Beginning cursor-size-change on pipe B, connector eDP-1

cursor-size-change on pipe B, connector eDP-1: PASSED

Subtest cursor-size-change: SUCCESS
[root at x-e6510 tests]# dmesg -r|egrep "<[1-4]>"|grep drm
<4>[ 2110.919802] WARNING: CPU: 2 PID: 4067 at
drivers/gpu/drm/i915/intel_display.c:902 intel_wait_for_vblank+0x156/0x179
[i915]()
<4>[ 2110.919805] Modules linked in: iTCO_wdt b43 mac80211 cfg80211
iTCO_vendor_support ppdev rfkill dm_mod snd_hda_codec_hdmi snd_hda_codec_idt
snd_hda_codec_generic dcdbas pcspkr i2c_i801 lpc_ich mfd_core firewire_ohci
snd_hda_intel firewire_core snd_hda_controller crc_itu_t snd_hda_codec
snd_hwdep snd_pcm snd_timer bcma snd soundcore wmi parport_pc parport battery
tpm_tis tpm ac acpi_cpufreq joydev i915 button video drm_kms_helper drm
cfbfillrect cfbimgblt cfbcopyarea
<4>[ 2110.919836] CPU: 2 PID: 4067 Comm: kms_cursor_crc Tainted: G        W    
 3.17.0-rc2_drm-intel-fixes_2a592b_20140902+ #2054
<4>[ 2110.920101]  [<f805019d>] ? drm_mode_set_config_internal+0x39/0x8a [drm]
<4>[ 2110.920112]  [<f80503b1>] ? drm_framebuffer_remove+0x70/0xd6 [drm]
<4>[ 2110.920123]  [<f805367a>] ? drm_mode_rmfb+0xa7/0xcd [drm]
<4>[ 2110.920133]  [<f80535d3>] ? drm_mode_addfb2+0x27/0x27 [drm]
<4>[ 2110.920141]  [<f8049dba>] ? drm_ioctl+0x233/0x35c [drm]
<4>[ 2110.920152]  [<f80535d3>] ? drm_mode_addfb2+0x27/0x27 [drm]
<4>[ 2110.920172]  [<f8049b87>] ? drm_getstats+0xe/0xe [drm]

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