[Bug 86095] [ILK]igt/kms_mmio_vs_cs_flip/setplane_vs_cs_flip sporadically causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86095

--- Comment #2 from lu hua <huax.lu at intel.com> ---
Created attachment 109925
  --> https://bugs.freedesktop.org/attachment.cgi?id=109925&action=edit
dmesg(CONFIG_DRM_I915_FBDEV=n)

add CONFIG_DRM_I915_FBDEV=n, the hang disappears, but reports warning.

[  193.280972] ------------[ cut here ]------------
[  193.281040] WARNING: CPU: 1 PID: 3960 at
drivers/gpu/drm/i915/intel_display.c:901 intel_wait_for_vblank+0xab/0x1a0
[i915]()
[  193.281046] vblank wait on pipe B timed out
[  193.281050] Modules linked in: netconsole configfs snd_hda_codec_hdmi
snd_hda_codec_idt snd_hda_codec_generic i2c_i801 lpc_ich mfd_core snd_hda_intel
snd_hda_controller firew
ire_ohci snd_hda_codec snd_hwdep firewire_core crc_itu_t snd_pcm bcma snd_timer
snd soundcore dm_mod wmi battery parport_pc parport tpm_tis tpm ac acpi_cpufreq
i915 button video
 drm_kms_helper drm [last unloaded: netconsole]
[  193.281150] CPU: 1 PID: 3960 Comm: kms_mmio_vs_cs_ Tainted: G        W     
3.18.0-rc5_kcloud_342400_20141124+ #184
[  193.281155] Hardware name: Dell Inc. Latitude E6510/0JKDHD, BIOS A05
08/10/2010
[  193.281159]  00000000 00000000 ec675cac c17689a2 ec675cd4 ec675cc4 c10312af
f85ab08c
[  193.281180]  f57f0000 00000453 fffe5e39 ec675cdc c10312f1 00000009 ec675cd4
f85f6674
[  193.281202]  ec675cf0 ec675d08 f85ab08c f85f4a09 00000385 f85f6674 00000042
00000001
[  193.281223] Call Trace:
[  193.281234]  [<c17689a2>] dump_stack+0x41/0x52
[  193.281244]  [<c10312af>] warn_slowpath_common+0x66/0x7d
[  193.281295]  [<f85ab08c>] ? intel_wait_for_vblank+0xab/0x1a0 [i915]
[  193.281303]  [<c10312f1>] warn_slowpath_fmt+0x2b/0x2f
[  193.281354]  [<f85ab08c>] intel_wait_for_vblank+0xab/0x1a0 [i915]
[  193.281407]  [<f85c4051>] intel_dp_link_down+0x18b/0x195 [i915]
[  193.281459]  [<f85c43f0>] ilk_post_disable_dp+0x1a/0xb9 [i915]
[  193.281509]  [<f85b3bbb>] ironlake_crtc_disable+0xb5/0x630 [i915]
[  193.281561]  [<f85af13c>] __intel_set_mode+0x6d1/0x109a [i915]
[  193.281568]  [<c106f337>] ? vprintk_emit+0x468/0x47b
[  193.281574]  [<c106f337>] ? vprintk_emit+0x468/0x47b
[  193.281624]  [<f85b54a6>] intel_set_mode+0x17/0x2f [i915]
[  193.281675]  [<f85b612b>] intel_crtc_set_config+0x8be/0x984 [i915]
[  193.281706]  [<f8053268>] drm_mode_set_config_internal+0x41/0xa0 [drm]
[  193.281734]  [<f8056522>] drm_mode_setcrtc+0x32b/0x40e [drm]
[  193.281762]  [<f80561f7>] ? drm_mode_setplane+0x188/0x188 [drm]
[  193.281784]  [<f804c2ea>] drm_ioctl+0x39d/0x413 [drm]
[  193.281811]  [<f80561f7>] ? drm_mode_setplane+0x188/0x188 [drm]
[  193.281820]  [<c1020792>] ? lapic_next_event+0x1b/0x1f
[  193.281842]  [<f804bf4d>] ? drm_copy_field+0x5c/0x5c [drm]
[  193.281850]  [<c110ec48>] do_vfs_ioctl+0x417/0x4cc
[  193.281857]  [<c107f22b>] ? current_kernel_time+0x54/0x98
[  193.281863]  [<c106205d>] ? trace_hardirqs_on_caller+0x14b/0x166
[  193.281869]  [<c1062083>] ? trace_hardirqs_on+0xb/0xd
[  193.281876]  [<c110ed40>] SyS_ioctl+0x43/0x67
[  193.281903]  [<c176f278>] sysenter_do_call+0x12/0x12
[  193.281909] ---[ end trace c5acaa57c78c67fb ]---

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