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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [BSW Regression]igt/gem_concurrent_blit/gtt-bcs-overwrite-source-forked fails"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=84891">84891</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[BSW Regression]igt/gem_concurrent_blit/gtt-bcs-overwrite-source-forked fails
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Keywords</th>
          <td>bisect_pending
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>high
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>DRM/Intel
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>jinxianx.guo@intel.com
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr></table>
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        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=107690" name="attach_107690" title="dmesg">attachment 107690</a> <a href="attachment.cgi?id=107690&action=edit" title="dmesg">[details]</a></span>
dmesg

==System Environment==
--------------------------
Regression: Yes.
It's a igt regression bug 
Good commit: 1244fc6b9bc56cdf1584e919230796082b93f371(here has another <a class="bz_bug_link 
          bz_status_VERIFIED  bz_closed"
   title="VERIFIED FIXED - [BSW]igt/gem_concurrent_blit some subcases cause long time to execute"
   href="show_bug.cgi?id=84354">bug
84354</a>)
Bud commit: 32a0308e2da1ed5871e21ca81822fc0c8aa73f9e

Non-working platforms: BSW

==kernel==
--------------------------
origin/drm-intel-nightly: ea4bec8e96ea8b33b49a7892c1c7f20041a56da6(fails)
    drm-intel-nightly: 2014y-10m-09d-07h-58m-45s UTC integration manifest
origin/drm-intel-next-queued: a128efeaa64609a9672b51bb37bb703e1b0f0128(fails)
    drm/i915: Suppress no action noise from oom shrinker
origin/drm-intel-fixes: bfe01a5ba2490f299e1d2d5508cbbbadd897bbe9(fails)
    Linux 3.17

==Bug detailed description==
igt/gem_concurrent_blit/gtt-bcs-overwrite-source-forked fails

Output:
[root@x-bsw01 tests]# ./gem_concurrent_blit --run-subtest
gtt-bcs-overwrite-source-forked
IGT-Version: 1.8-g32a0308 (x86_64) (Linux:
3.17.0_drm-intel-nightly_ea4bec_20141011+ x86_64)
using 2x512 buffers, each 1MiB
Test assertion failure function gtt_cmp_bo, file gem_concurrent_blit.c:124:
Failed assertion: vaddr[y*width+y] == val
error: 0xf000eef3 != 0xa
child 6 failed with exit status 99
Subtest gtt-bcs-overwrite-source-forked: FAIL (1.482s)
[root@x-bsw01 tests]# dmesg -r|egrep "<[1-4]>"|grep drm
<3>[    2.201775] [drm:i915_stolen_to_physical] *ERROR* conflict detected with
stolen region: [0x7ce00000 - 0x7ee00000]
<3>[    2.288612] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A
FIFO underrun



==Reproduce steps==
---------------------------- 
1. ./gem_concurrent_blit --run-subtest gtt-bcs-overwrite-source-forked</pre>
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