[Bug 89959] New: [SKL]igt/gem_concurrent_blit subcase sporadically causes system hang and *ERROR* blitter: timed out waiting for forcewake ack to clear.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89959

            Bug ID: 89959
           Summary: [SKL]igt/gem_concurrent_blit subcase sporadically
                    causes system hang and *ERROR* blitter: timed out
                    waiting for forcewake ack to clear.
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: highest
         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 114969
  --> https://bugs.freedesktop.org/attachment.cgi?id=114969&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure, We disabled it in old test.

Non-working platforms: SKL

==kernel==
--------------------------
drm-intel-nightly/333cf6eed7cae0ee2d6bb1b4c4d421b94f84fc13
commit 333cf6eed7cae0ee2d6bb1b4c4d421b94f84fc13
Author: Jani Nikula <jani.nikula at intel.com>
Date:   Thu Apr 2 11:38:12 2015 +0300

    drm-intel-nightly: 2015y-04m-02d-08h-37m-57s UTC integration manifest

==Bug detailed description==
-----------------------------
It sporadically causes system hang and *ERROR* blitter: timed out waiting for
forcewake ack to clear. Fail rate: 1/3.

root at x-skly05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time
./gem_concurrent_blit --run-subtest gtt-blt-overwrite-source-read-rcs-forked
IGT-Version: 1.10-ga6c3b32 (x86_64) (Linux:
4.0.0-rc6_drm-intel-nightly_333cf6_20150403+ x86_64)
using 2x512 buffers, each 1MiB
Subtest gtt-blt-overwrite-source-read-rcs-forked: SUCCESS (6.178s)

real    0m6.607s
user    0m8.217s
sys     0m9.462s
root at x-skly05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time
./gem_concurrent_blit --run-subtest gtt-blt-overwrite-source-read-rcs-forked
IGT-Version: 1.10-ga6c3b32 (x86_64) (Linux:
4.0.0-rc6_drm-intel-nightly_333cf6_20150403+ x86_64)
using 2x512 buffers, each 1MiB
Subtest gtt-blt-overwrite-source-read-rcs-forked: SUCCESS (6.384s)

real    0m6.599s
user    0m8.126s
sys     0m9.998s
root at x-skly05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time
./gem_concurrent_blit --run-subtest gtt-blt-overwrite-source-read-rcs-forked
IGT-Version: 1.10-ga6c3b32 (x86_64) (Linux:
4.0.0-rc6_drm-intel-nightly_333cf6_20150403+ x86_64)
using 2x512 buffers, each 1MiB

==Reproduce steps==
---------------------------- 
1. time ./gem_concurrent_blit --run-subtest
gtt-blt-overwrite-source-read-rcs-forked

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