Created attachment 113041 [details]
dmesg for case igt/gem_evict_alignment/minor-hang

==System Environment==
--------------------------
Regression: yes
Non-working platforms:  IVB

==kernel==
--------------------------
drm-intel-nightly/8b4216f91c7bf8d3459cadf9480116220bd6545e(2015-02-02)


==Bug detailed description==
-----------------------------
igt/gem_evict_alignment/minor-hang spend more than 10 minute to run. And there is abnormal output in dmesg.

  dmesg -r|egrep "<[1-4]>"|grep drm
<4>[    2.331349] WARNING: CPU: 0 PID: 1040 at drivers/gpu/drm/i915/i915_gem.c:4525 i915_gem_free_object+0x131/0x26b [i915]()
<4>[    2.331352] Modules linked in: i915 button video drm_kms_helper drm cfbfillrect cfbimgblt cfbcopyarea
<4>[    2.331353] CPU: 0 PID: 1040 Comm: kworker/u8:6 Not tainted 3.19.0-rc6_dr -intel-nightly_8b4216_20150202+ #126
<4>[    2.331446]  [<ffffffffa00181a1>] ? drm_mode_set_config_internal+0xa1/0xd2 [drm]
<4>[    2.331448]  [<ffffffffa0065282>] ? restore_fbdev_mode+0xa8/0xc3 [drm_kms_helper]
<4>[    2.331450]  [<ffffffffa006659f>] ? drm_fb_helper_restore_fbdev_mode_unlocked+0x1f/0x56 [drm_kms_helper]
<4>[    2.331452]  [<ffffffffa0066604>] ? drm_fb_helper_set_par+0x2e/0x33 [drm_kms_helper]
<4>[    2.331501]  [<ffffffffa006685b>] ? drm_fb_helper_initial_config+0x252/0x2ef [drm_kms_helper]
<4>[   89.643322] WARNING: CPU: 1 PID: 1039 at drivers/gpu/drm/i915/i915_irq.c:2615 i915_handle_error+0x58/0x5bd [i915]()
<4>[   89.643414]  ipv6 snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic dm_mod pcspkr snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep i2c_i801 snd_pcm lpc_ich snd_timer mfd_core snd soundcore parport_pc parport battery wmi acpi_cpufreq i915 button video drm_kms_helper drm cfbfillrect cfbimgblt cfbcopyarea
<4>[   89.643599] CPU: 1 PID: 1039 Comm: kworker/u8:5 Tainted: G        W      3.19.0-rc6_drm-intel-nightly_8b4216_20150202+ #126

==Reproduce steps==
---------------------------- 
1. ./gem_evict_alignment --run-subtest minor-hang