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

        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [BSW Regression]igt/gem_tiled_partial_pwrite_pread/writes causes system hang"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=81989">81989</a>
          </td>
        </tr>

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

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

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

        <tr>
          <th>Summary</th>
          <td>[BSW Regression]igt/gem_tiled_partial_pwrite_pread/writes causes system hang
          </td>
        </tr>

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

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

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

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

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

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

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

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

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

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr></table>
      <p>
        <div>
        <pre>==System Environment==
--------------------------
Regression: Yes. 
Good commit on -next-queued: c79057922ed6c2c6df1214e6ab4414fea1b23db2(skipped)

Non-working platforms: BSW

==kernel==
--------------------------
origin/drm-intel-nightly: ddbc288690cd888dd6f5629ccba9a2691a70b7b0(fails)
    drm-intel-nightly: 2014y-07m-31d-10h-07m-17s integration manifest
origin/drm-intel-next-queued: 17c58fe801f5588c5904cc2f15620f7f5a465b53(fails)
    drm/i915: Align intel_dsi*.c files a bit
origin/drm-intel-fixes: f4be89cecea437aaddd7700d05c6bdb5678041f7(works)
    drm/i915: Fix crash when failing to parse MIPI VBT

==Bug detailed description==
igt/gem_tiled_partial_pwrite_pread/writes causes system hang

Output:
[root@x-bsw01 tests]# time ./gem_tiled_partial_pwrite_pread --run-subtest
writes
IGT-Version: 1.7-gde1e877 (x86_64) (Linux:
3.16.0-rc6_drm-intel-nightly_c95053_20140731+ x86_64)
partial writes test:   9%

Unable to get dmesg because system hang

==Reproduce steps==
---------------------------- 
1. ./gem_tiled_partial_pwrite_pread --run-subtest writes</pre>
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