[Bug 89493] New: [SKL]Piglit spec_EXT_texture_array_copyteximage_1D_ARRAY_samples=2 sporadically sporadically causes GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89493

            Bug ID: 89493
           Summary: [SKL]Piglit
                    spec_EXT_texture_array_copyteximage_1D_ARRAY_samples=2
                    sporadically sporadically causes GPU hang
           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

Created attachment 114141
  --> https://bugs.freedesktop.org/attachment.cgi?id=114141&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure, it always has gpu hang issue on SKL, reported bug 89037

no-working platforms: SKL

==kernel==
--------------------------
drm-intel-nightly/c2f6e584b215dd0d7e5a8a02716a89e985366ec0
commit c2f6e584b215dd0d7e5a8a02716a89e985366ec0
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Fri Mar 6 18:30:27 2015 +0100

    drm-intel-nightly: 2015y-03m-06d-17h-29m-53s UTC integration manifest

==Bug detailed description==
-----------------------------
Run this case 20 cycles, it causes GPU hang. 

root at x-skly05:/home/lh# dmesg -r|egrep "<[1-4]>"|grep drm
<3>[   46.724398] [drm:i915_hangcheck_elapsed [i915]] *ERROR* Hangcheck timer
elapsed... blitter ring idle
<3>[   48.589274] [drm:gen8_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun

Reproduce steps:
-------------------------
1. xinit
2. bin/copyteximage 1D_ARRAY -samples=2 -auto

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