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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] Test machine hang up when kill gnome-session two times"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89727">89727</a>
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<th>Summary</th>
<td>[SKL] Test machine hang up when kill gnome-session two times
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>Linux (All)
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>critical
</td>
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>yex.tian@intel.com
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org, mengmeng.meng@intel.com
</td>
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<pre>System Environment:
-----------------------------------------------------
Platform: SKL
Regression: Not sure, this bug was introduced by fix another known issue:
bug-89388, we verified below commit (exist in drm-intel-next-queued branch) was
intent to fix bug-89388, but cause this issue.
The console show this error message:” [drm:gen8_irq_handler [i915]] *ERROR* CPU
pipe A FIFO underrun”
==Kernel==
--------------------------------------------------
commit c9f038a1a5924352ab8e510e4a45ac57b08db391
Author: Matt Roper <<a href="mailto:matthew.d.roper@intel.com">matthew.d.roper@intel.com</a>>
AuthorDate: Mon Mar 9 11:06:02 2015 -0700
Commit: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
CommitDate: Tue Mar 17 22:30:17 2015 +0100
drm/i915: Don't assume primary & cursor are always on for wm calculation
(v4)
Current ILK-style watermark code assumes the primary plane and cursor
plane are always enabled. This assumption, along with the combination
of two independent commits that got merged at the same time, results in
a NULL dereference. The offending commits are:Bug detailed description:
--------------------------------------------------
Reproduce steps:
----------------------------
1, Boot up system with edp display connected
2. xinit &
3. gnome-session
4. kill x
5. Repeat step 2-4, will encounter machine hang up issue.</pre>
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