[Bug 89882] New: [SKL]igt/kms_cursor_crc sporadically causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89882

            Bug ID: 89882
           Summary: [SKL]igt/kms_cursor_crc sporadically causes system
                    hang
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: high
         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 114840
  --> https://bugs.freedesktop.org/attachment.cgi?id=114840&action=edit
dmesg

System Environment:
--------------------------
Regression: not sure
Non-working platforms: SKL

==kernel==
--------------------------
drm-intel-nightly/d72ff1ab1499711c941831400629c14493313b3a
commit d72ff1ab1499711c941831400629c14493313b3a
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Tue Mar 31 17:30:12 2015 +0200

    drm-intel-nightly: 2015y-03m-31d-15h-29m-33s UTC integration manifest


==Bug detailed description==
-----------------------------
Run ./kms_cursor_crc --run-subtest cursor-256x256-onscreen on SKL-Y with
-nightly kernel, it causes system hang at the 2nd round.

output:
IGT-Version: 1.10-g2f0e3cd (x86_64) (Linux:
4.0.0-rc6_drm-intel-nightly_d72ff1_2
Beginning cursor-256x256-onscreen on pipe A, connector eDP-1
............................
cursor-256x256-onscreen on pipe A, connector eDP-1: PASSED

Beginning cursor-256x256-onscreen on pipe B, connector eDP-1
............................
cursor-256x256-onscreen on pipe B, connector eDP-1: PASSED

Beginning cursor-256x256-onscreen on pipe C, connector eDP-1
............................
cursor-256x256-onscreen on pipe C, connector eDP-1: PASSED

Subtest cursor-256x256-onscreen: SUCCESS (29.165s)

real    0m29.859s
user    0m5.726s
sys     0m0.527s
root at x-skly05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time
./kms_cursor_crc --run-subtest cursor-256x256-onscreen
IGT-Version: 1.10-g2f0e3cd (x86_64) (Linux:
4.0.0-rc6_drm-intel-nightly_d72ff1_20150401+ x86_64)
Beginning cursor-256x256-onscreen on pipe A, connector eDP-1
.Warning on condition crc->crc[i] == 0xffffffff in fucntion crc_sanity_checks,
file igt_debugfs.c:494
Suspicious CRC: it looks like the CRC read back was from a register in a
powered down well

==Reproduce steps==
---------------------------- 
1. run ./kms_cursor_crc --run-subtest cursor-256x256-onscreen twice

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