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      <base href="https://bugs.freedesktop.org/" />
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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 --- - [SNB Bisected]igt/gem_reset_stats/close-pending-fork-render causes system hang"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=74100">74100</a>
          </td>
        </tr>

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

        <tr>
          <th>Assignee</th>
          <td>mika.kuoppala@intel.com
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[SNB Bisected]igt/gem_reset_stats/close-pending-fork-render causes system hang
          </td>
        </tr>

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

        <tr>
          <th>Severity</th>
          <td>critical
          </td>
        </tr>

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

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

        <tr>
          <th>Reporter</th>
          <td>huax.lu@intel.com
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </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>Created <span class=""><a href="attachment.cgi?id=92828" name="attach_92828" title="dmesg">attachment 92828</a> <a href="attachment.cgi?id=92828&action=edit" title="dmesg">[details]</a></span>
dmesg

System Environment:
--------------------------
Platform: Sandybridge
Kernel(drm-intel-nightly)f27f16540be56813df2ebb8e1106dd5c258f07c3

Bug detailed description:
-------------------------
It causes system hang on sandybridge with -nightly, -queued and -fixes kernel.

Bsiect shows: igt commit c05c88c2b641aaab83608fb2c8e816893690c1fe is the first
bad commit.
commit c05c88c2b641aaab83608fb2c8e816893690c1fe
Author:     Mika Kuoppala <<a href="mailto:mika.kuoppala@linux.intel.com">mika.kuoppala@linux.intel.com</a>>
AuthorDate: Tue Jan 21 17:40:08 2014 +0200
Commit:     Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
CommitDate: Wed Jan 22 09:45:27 2014 +0100

    tests/gem_reset_stats: stop only one ring when submitting hang

    If we stop all the rings, we can end up blaming the innocent
    rings on hangcheck.

    Reference: <a class="bz_bug_link 
          bz_status_ASSIGNED "
   title="ASSIGNED --- - [SNB/IVB/HSW/BYT/BDW]igt/gem_reset_stats causes *ERROR* context hanging too fast, declaring banned!"
   href="show_bug.cgi?id=73652">https://bugs.freedesktop.org/show_bug.cgi?id=73652</a>
    Signed-off-by: Mika Kuoppala <<a href="mailto:mika.kuoppala@intel.com">mika.kuoppala@intel.com</a>>
    Signed-off-by: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>

output:
IGT-Version: 1.5-gb5109e6 (x86_64) (Linux:
3.13.0-rc8_drm-intel-nightly_f27f16_20140126+ x86_64)
Subtest close-pending-fork-render: SUCCESS
Test requirement not met in function gem_require_ring, file
./../lib/drmtest.h:311:
Last errno: 11, Resource temporarily unavailable
Test requirement: (!(gem_has_vebox(fd)))
Subtest reset-stats-vebox: SKIP
Subtest reset-stats-ctx-vebox: SKIP
Subtest ban-vebox: SKIP
Subtest ban-ctx-vebox: SKIP
Subtest reset-count-vebox: SKIP
Subtest reset-count-ctx-vebox: SKIP
Subtest unrelated-ctx-vebox: SKIP
Subtest close-pending-vebox: SKIP
Subtest close-pending-ctx-vebox: SKIP
Subtest close-pending-fork-vebox: SKIP

Reproduce steps:
-------------------------
1. ./gem_reset_stats --run-subtest close-pending-fork-render</pre>
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