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<base href="https://bugs.freedesktop.org/" />
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<th>Priority</th>
<td>medium
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - segfault in sna_set_cursor_position with PRIME + opengl compositing"
href="https://bugs.freedesktop.org/show_bug.cgi?id=77053">77053</a>
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<th>Assignee</th>
<td>chris@chris-wilson.co.uk
</td>
</tr>
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<th>Summary</th>
<td>segfault in sna_set_cursor_position with PRIME + opengl compositing
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Reporter</th>
<td>haagch.christoph@googlemail.com
</td>
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<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>git
</td>
</tr>
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<th>Component</th>
<td>Driver/intel
</td>
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<th>Product</th>
<td>xorg
</td>
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<pre>Created <span class=""><a href="attachment.cgi?id=96902" name="attach_96902" title="gdb with bt and bt full">attachment 96902</a> <a href="attachment.cgi?id=96902&action=edit" title="gdb with bt and bt full">[details]</a></span>
gdb with bt and bt full
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Wimbledon XT [Radeon HD 7970M] (rev ff)
mesa, xf86-video-ati and xf86-video-intel from latest git, xorg 1.15 stable.
It only happens in relatively specific circumstances.
I have reproduced it with wine + space engine, wine + furmark (both times with
a virtual 1920x1080 wine desktop) and antichamber (native version from humble
bundle).
With xrender compositing everything is fine. With OpenGL compositing I get this
segfault.
With OpenGL compositing and PRIME there is sometimes this bug:
<a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - prime: black window"
href="show_bug.cgi?id=69101">https://bugs.freedesktop.org/show_bug.cgi?id=69101</a> (there are multiple issues
described, I am talking about the window content not being rendered initially,
but only after resizing the window/minimizing+restoring etc.). It might or
might not be related but I believe in every instance the crash happened the
initial rendering didn't work. Strangely the usual workaround of minimizing and
restoring a window doesn't seem to "fix" the rendering now.
For wine+space engine this happens every time: I start it with DRI_PRIME=1
GALLIUM_HUD=fps wine SpaceEngine.exe, wait a bit until the menu should be
loaded, but the screen is blank. I hit the shortcut for minimizing the window,
X crashes. This only happens since recently I believe, but I have not yet
investigated since when.
For antichamber it's kind of the opposite, as minimizing works and the crash
happened as soon as I managed to get it to render the contents.
Anyway, attached is "bt" and "bt full" from gdb.
The variable "cursor" is a null pointer.
>From how I see it the cursor variable gets initialized with NULL, but never
set.
It looks like f98b2e164637292c2425f6e6d2c22bd9a2800f8e broke it by removing
cursor = __sna_get_cursor(sna, crtc); among some other changes, so perhaps
this is just some leftover stuff that was forgotten to be changed.
<a href="http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=f98b2e164637292c2425f6e6d2c22bd9a2800f8e">http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=f98b2e164637292c2425f6e6d2c22bd9a2800f8e</a></pre>
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