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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 - TONGA hang in amdgpu_ring_lock"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=91790">91790</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>TONGA hang in amdgpu_ring_lock
          </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/AMDgpu
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>dri-devel@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>master.homer@gmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=117962" name="attach_117962" title="dmesg of hang">attachment 117962</a> <a href="attachment.cgi?id=117962&action=edit" title="dmesg of hang">[details]</a></span>
dmesg of hang

I've been getting random hangs in amdgpu_ring_lock, this causes X to hang,
meaning I can't use the computer at all. I can sometimes switch to a tty, but
this doesn't always work either.

I'm running Ubuntu 15.04 with mesa and libdrm from the oibaf ppa, with a
self-compiled xf86-video-amdgpu and a self-compiled kernel from agd5f,
drm-next-4.3-wip (9066b0c318589f47b754a3def4fe8ec4688dc21a).

I haven't been able to predict when the hang will happen, sometimes I can use
it for several hours before it hangs, other times it happens just a few minutes
after booting.</pre>
        </div>
      </p>
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