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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [BYT/BSW]igt/gem_userptr_blits/dmabuf-sync Bus error"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=85354">85354</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[BYT/BSW]igt/gem_userptr_blits/dmabuf-sync Bus error
          </td>
        </tr>

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

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

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

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

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

        <tr>
          <th>Priority</th>
          <td>medium
          </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>huax.lu@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>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=108277" name="attach_108277" title="dmesg">attachment 108277</a> <a href="attachment.cgi?id=108277&action=edit" title="dmesg">[details]</a></span>
dmesg

==System Environment==
--------------------------
Regression: not sure

Non-working platforms: BYT BSW

==kernel==
--------------------------
drm-intel-nightly/77683b77aa4da6e1788838dad2d2a15b0dfc290b

==Bug detailed description==
-----------------------------
gem_userptr_blits subcases dmabuf-sync and dmabuf-unsync causes bus error.

output:
IGT-Version: 1.8-gbba1cd0 (x86_64) (Linux:
3.18.0-rc1_drm-intel-nightly_77683b_20141023+ x86_64)
Aperture size is 2048 MiB
Total RAM is 3837 MiB
Testing unsynchronized mappings...
Testing synchronized mappings...
Bus error (core dumped)

==Reproduce steps==
---------------------------- 
1. ./gem_userptr_blits --run-subtest dmabuf-sync</pre>
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