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      <base href="https://bugs.freedesktop.org/" />
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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 - [BSW]igt/gem_exec_nop/render causes [drm:i915_context_is_banned [i915]] *ERROR* gpu hanging too fast, banning!"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=89633">89633</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[BSW]igt/gem_exec_nop/render causes [drm:i915_context_is_banned [i915]] *ERROR* gpu hanging too fast, banning!
          </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=114423" name="attach_114423" title="dmesg">attachment 114423</a> <a href="attachment.cgi?id=114423&action=edit" title="dmesg">[details]</a></span>
dmesg

==System Environment==
--------------------------
Regression: not sure, it has <a class="bz_bug_link 
          bz_status_VERIFIED  bz_closed"
   title="VERIFIED DUPLICATE - [BSW ppgtt Bisected]igt/gem_exec_nop/render sporadically causes system hang"
   href="show_bug.cgi?id=88845">bug 88845</a>

no-working platforms: BSW

==kernel==
--------------------------
drm-intel-nightly/3753ea527e539d3358a6368e77cb29ecb2e71c42
commit 3753ea527e539d3358a6368e77cb29ecb2e71c42
Author: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
Date:   Tue Mar 17 22:36:04 2015 +0100

    drm-intel-nightly: 2015y-03m-17d-21h-35m-20s UTC integration manifest

==Bug detailed description==
-----------------------------
It happens on drm-intel-nightly kernel, works well on drm-intel-next-queued
kernel.

output:
IGT-Version: 1.10-g505645c (x86_64) (Linux:
4.0.0-rc4_drm-intel-nightly_3753ea_20150318+ x86_64)
Time to exec x 1:               487.000µs (ring=render)
Time to exec x 2:                65.500µs (ring=render)
Time to exec x 4:                28.000µs (ring=render)
Time to exec x 8:                19.125µs (ring=render)
Time to exec x 16:               12.750µs (ring=render)
Time to exec x 32:               10.688µs (ring=render)
Time to exec x 64:                7.156µs (ring=render)
Time to exec x 128:               6.453µs (ring=render)
Time to exec x 256:               5.773µs (ring=render)
Time to exec x 512:               5.232µs (ring=render)
Time to exec x 1024:              5.241µs (ring=render)
Time to exec x 2048:              5.426µs (ring=render)
Time to exec x 4096:              4.485µs (ring=render)
Time to exec x 8192:              4.476µs (ring=render)
Time to exec x 16384:             5.002µs (ring=render)
Test assertion failure function loop, file gem_exec_nop.c:100:
Failed assertion: exec(fd, handle, count, ring_id) == 0
error: -1 != 0
Subtest render failed.
**** DEBUG ****
Time to exec x 1:               487.000µs (ring=render)
Time to exec x 2:                65.500µs (ring=render)
Time to exec x 4:                28.000µs (ring=render)
Time to exec x 8:                19.125µs (ring=render)
Time to exec x 16:               12.750µs (ring=render)
Time to exec x 32:               10.688µs (ring=render)
Time to exec x 64:                7.156µs (ring=render)
Time to exec x 128:               6.453µs (ring=render)
Time to exec x 256:               5.773µs (ring=render)
Time to exec x 512:               5.232µs (ring=render)
Time to exec x 1024:              5.241µs (ring=render)
Time to exec x 2048:              5.426µs (ring=render)
Time to exec x 4096:              4.485µs (ring=render)
Time to exec x 8192:              4.476µs (ring=render)
Time to exec x 16384:             5.002µs (ring=render)
Test assertion failure function loop, file gem_exec_nop.c:100:
Failed assertion: exec(fd, handle, count, ring_id) == 0
error: -1 != 0
****  END  ****
Subtest render: FAIL (12.488s)

==Reproduce steps==
---------------------------- 
1.  ./gem_exec_nop --run-subtest render</pre>
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