[Bug 81374] New: [BSW Regression]igt/drv_hangman/error-state-capture-blt causes "[drm:i915_context_is_banned] *ERROR* gpu hanging too fast, banning!" sporadically

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81374

          Priority: high
            Bug ID: 81374
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BSW
                    Regression]igt/drv_hangman/error-state-capture-blt
                    causes "[drm:i915_context_is_banned] *ERROR* gpu
                    hanging too fast, banning!" sporadically
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 102832
  --> https://bugs.freedesktop.org/attachment.cgi?id=102832&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes
On commit of -next-queued(91565c85b66db820f01894a971d39aaef60c4325)
The fail rate about 1 out of 2

Non-working platforms: BSW

==kernel==
--------------------------
origin/drm-intel-nightly: 2a38e1bcd4dc9523cd723291340226d139bece1b(fails)
    drm-intel-nightly: 2014y-07m-14d-23h-18m-30s integration manifest
origin/drm-intel-next-queued: ebcdf5276e6e2ddef6a4fd7716684030301a6fed(fails)
    drm/i915: Handle failure to kick out a conflicting fb driver
origin/drm-intel-fixes: c6930992948adf0f8fc1f6ff1da51c5002a2cf95(fails)
    Revert "drm/i915: reverse dp link param selection, prefer fast over wide
again"

==Bug detailed description==
igt/drv_hangman/error-state-capture-blt causes "[drm:i915_context_is_banned]
*ERROR* gpu hanging too fast, banning!" sporadically

Output:
[root at x-bsw01 tests]# ./drv_hangman --run-subtest error-state-capture-blt
IGT-Version: 1.7-ge74dd22 (x86_64) (Linux:
3.16.0-rc5_drm-intel-nightly_2a38e1_20140715+ x86_64)
Test assertion failure function gem_execbuf, file ioctl_wrappers.c:428:
Failed assertion: ret == 0
Last errno: 5, Input/output error
Subtest error-state-capture-blt: FAIL
[root at x-bsw01 tests]# dmesg -r|egrep "<[1-3>]"|grep drm
<3>[  180.759598] [drm:i915_context_is_banned] *ERROR* gpu hanging too fast,
banning!

On fixes branch, the failure and error message is difference

Output:
[root at x-bsw01 tests]# ./drv_hangman --run-subtest error-state-capture-blt
IGT-Version: 1.7-ge74dd22 (x86_64) (Linux:
3.16.0-rc5_drm-intel-fixes_c69309_20140715+ x86_64)
Test assertion failure function gem_quiescent_gpu, file drmtest.c:153:
Failed assertion: drmIoctl((fd), ((((1U) << (((0+8)+8)+14)) | ((('d')) <<
(0+8)) | (((0x40 + 0x29)) << 0) | ((((sizeof(struct
drm_i915_gem_execbuffer2)))) << ((0+8)+8)))), (&execbuf)) == 0
Last errno: 5, Input/output error
Subtest error-state-capture-blt: FAIL
[root at x-bsw01 tests]# dmesg -r|egrep ""<[1-3>]""|grep drm
<3>[  134.207607] [drm:__vlv_force_wake_get] *ERROR* Timed out: Render
forcewake old ack to clear.
<3>[  134.217607] [drm:__vlv_force_wake_get] *ERROR* Timed out: Media forcewake
old ack to clear.


==Reproduce steps==
---------------------------- 
1. ./drv_hangman --run-subtest error-state-capture-blt

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