[Bug 88095] New: [BDW]igt/gem_concurrent_blit/gtt-bcs-early-read-forked causes *ERROR* Unclaimed register detected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88095

            Bug ID: 88095
           Summary: [BDW]igt/gem_concurrent_blit/gtt-bcs-early-read-forked
                    causes *ERROR* Unclaimed register detected
           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

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

Non-working platforms: BDW

==kernel==
--------------------------
drm-intel-nightly/07d0c831d9207c937595f081c8fddbddbf53756f
commit 07d0c831d9207c937595f081c8fddbddbf53756f
Author: Jani Nikula <jani.nikula at intel.com>
Date:   Tue Dec 30 15:02:01 2014 +0200

    drm-intel-nightly: 2014y-12m-30d-13h-01m-34s UTC integration manifest

==Bug detailed description==
-----------------------------
It causes <3>[ 2121.211861] [drm:hsw_unclaimed_reg_detect.isra.4 [i915]]
*ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug
this problem. on drm-intel-nightly kernel when run automation testing. run the
binary, I am unable to reproduce it.

output:
IGT-Version: 1.9-gcb512b6 (x86_64) (Linux:
3.19.0-rc2_drm-intel-nightly_07d0c8_20150105+ x86_64)
using 2x512 buffers, each 1MiB
Subtest gtt-bcs-early-read-forked: SUCCESS (2.200s)

dmesg:
<3>[ 2121.211861] [drm:hsw_unclaimed_reg_detect.isra.4 [i915]] *ERROR*
Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this
problem.

==Reproduce steps==
---------------------------- 
1. run full igt.

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