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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - CNL unable to handle kernel paging request at 00000000fffffffc"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103800">103800</a>
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<th>Summary</th>
<td>CNL unable to handle kernel paging request at 00000000fffffffc
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>XOrg git
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>rafael.antognolli@intel.com
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=135561" name="attach_135561" title="Dmesg output showing the error.">attachment 135561</a> <a href="attachment.cgi?id=135561&action=edit" title="Dmesg output showing the error.">[details]</a></span>
Dmesg output showing the error.
I can run into this issue by executing piglit on CNL with the following branch:
<a href="https://cgit.freedesktop.org/~rantogno/mesa/log/?h=wip/cnl_disable_pc">https://cgit.freedesktop.org/~rantogno/mesa/log/?h=wip/cnl_disable_pc</a>
The kernel emits a backtrace and the machine becomes unusable shortly after
(it's not a simple GPU hang). Even ssh eventually stops working.
It takes a couple tries to happen. I had it happen with other branches too, and
I believe master also has the same issue.
I was using drm-tip from today, commit hash:
74ae8acff97c1739330154fa34bf5a64e28d608f
I also artificially disabled preemption by setting .has_logical_ring_preemption
= 0 on GEN9_FEATURES. I'll re-enable it and confirm that the bug still happens
(just wanted to start the discussion early).
Steps to reproduce:
- Disable gdm so that no X or gnome-wayland or anything like that is running
- with the above kernel, the mentioned mesa branch, and piglit installed, run
something like:
$ EGL_PLATFORM=gbm PIGLIT_PLATFORM=gbm ./piglit run gpu ~/piglit_output/
Make sure you have mesa, waffle and piglit built with gbm support. I believe
the bug would also happen in other platforms too, like X or wayland.</pre>
</div>
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