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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 - [skl] [drm] BUG: unable to handle kernel NULL pointer dereference at (null) [drm_kms_helper]"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=100727">100727</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[skl] [drm] BUG: unable to handle kernel NULL pointer dereference at (null)  [drm_kms_helper]
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>XOrg git
          </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>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>kang@insecure.ws
          </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=130927" name="attach_130927" title="i915_display_info with dock connected">attachment 130927</a> <a href="attachment.cgi?id=130927&action=edit" title="i915_display_info with dock connected">[details]</a></span>
i915_display_info with dock connected

-- Reboot --
Apr 19 13:08:31 xps13 kernel: IP: drm_dp_get_mst_branch_device+0xa2/0x110
[drm_kms_helper]
Apr 19 13:08:31 xps13 kernel: BUG: unable to handle kernel NULL pointer
dereference at           (null)


Sadly that is all I have as it freezes here - took a few tries to get any data
written to log before reboot. This happens when re-connecting a USB-C display
on a dock that has multiple video inputs (only one screen connected in addition
to laptop screen though).

Hardware: Dell XPS14 9350 / i915 / i7-6560U
Kernel tested: 4.10.10 and 4.11rc7
xorg-server: 1.19.3-2
xf86-video-intel: 1:2.99.917+770+gcb6ba2da-1 (git snap)

Will try to gather more data when it occurs - tips welcome though</pre>
        </div>
      </p>


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