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      <base href="https://bugs.freedesktop.org/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [drm] stuck on render ring"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=83343">83343</a>
          </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>[drm] stuck on render ring
          </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>pierg75@yahoo.it
          </td>
        </tr>

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

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

        <tr>
          <th>Version</th>
          <td>XOrg CVS
          </td>
        </tr>

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

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=105545" name="attach_105545" title="dump from /sys/class/drm/card0/error">attachment 105545</a> <a href="attachment.cgi?id=105545&action=edit" title="dump from /sys/class/drm/card0/error">[details]</a></span>
dump from /sys/class/drm/card0/error

It's happening from time to time.
The system frezees for a while and then resume (the WM is misbehaving after
this, but this might be another issue).
The messages I found the in the logs are:

Sep  1 11:08:16 plambri kernel: [11194.320270] [drm] stuck on render ring
Sep  1 11:08:16 plambri kernel: [11194.320749] [drm] GPU HANG: ecode
0:0xf5f7fffe, in X [1308], reason: Ring hung, action: reset
Sep  1 11:08:16 plambri kernel: [11194.320752] [drm] GPU hangs can indicate a
bug anywhere in the entire gfx stack, including userspace.
Sep  1 11:08:16 plambri kernel: [11194.320754] [drm] Please file a _new_ bug
report on bugs.freedesktop.org against DRI -> DRM/Intel
Sep  1 11:08:16 plambri kernel: [11194.320759] [drm] drm/i915 developers can
then reassign to the right component if it's not a kernel issue.
Sep  1 11:08:16 plambri kernel: [11194.320760] [drm] The gpu crash dump is
required to analyze gpu hangs, so please always attach it.
Sep  1 11:08:16 plambri kernel: [11194.320762] [drm] GPU crash dump saved to
/sys/class/drm/card0/error
Sep  1 11:08:16 plambri kernel: [drm] stuck on render ring
Sep  1 11:08:16 plambri kernel: [drm] GPU HANG: ecode 0:0xf5f7fffe, in X
[1308], reason: Ring hung, action: reset
Sep  1 11:08:16 plambri kernel: [drm] GPU hangs can indicate a bug anywhere in
the entire gfx stack, including userspace.
Sep  1 11:08:16 plambri kernel: [drm] Please file a _new_ bug report on
bugs.freedesktop.org against DRI -> DRM/Intel
Sep  1 11:08:16 plambri kernel: [drm] drm/i915 developers can then reassign to
the right component if it's not a kernel issue.
Sep  1 11:08:16 plambri kernel: [drm] The gpu crash dump is required to analyze
gpu hangs, so please always attach it.
Sep  1 11:08:16 plambri kernel: [drm] GPU crash dump saved to
/sys/class/drm/card0/error
Sep  1 11:08:18 plambri kernel: [11196.320804] [drm] Enabling RC6 states: RC6
on, RC6p on, RC6pp off
Sep  1 11:08:18 plambri kernel: [drm] Enabling RC6 states: RC6 on, RC6p on,
RC6pp off

I'm using fedora with these packages:

xorg-x11-server-Xorg-1.14.4-11.fc20.x86_64
xorg-x11-drv-intel-2.21.15-7.fc20.x86_64

kernel-3.15.10-201.fc20.x86_64

I'll attach the dump of the card0/error</pre>
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