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<base href="https://bugs.freedesktop.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Segmentation fault in Gnome Shell when resuming from blank screen"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107520">107520</a>
</td>
</tr>
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<th>Summary</th>
<td>Segmentation fault in Gnome Shell when resuming from blank screen
</td>
</tr>
<tr>
<th>Product</th>
<td>Mesa
</td>
</tr>
<tr>
<th>Version</th>
<td>18.1
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</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>Drivers/DRI/i965
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-3d-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>pbasista@gmail.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=141004" name="attach_141004" title="full backtrace of gnome-shell crashing on SIGSEGV in image_get_buffers">attachment 141004</a> <a href="attachment.cgi?id=141004&action=edit" title="full backtrace of gnome-shell crashing on SIGSEGV in image_get_buffers">[details]</a></span>
full backtrace of gnome-shell crashing on SIGSEGV in image_get_buffers
When resuming from blank screen in Gnome Shell (can be configured in
Settings->Power), Gnome Shell process sometimes (around 40% to 50% of cases in
my experience) crashes on segmentation fault. The backtraces vary slightly, but
mostly they point to intel_update_image_buffers function in the
src/mesa/drivers/dri/i965/brw_context.c file.
There is a related bug report on Gnome Bugzilla:
<a href="https://bugzilla.gnome.org/show_bug.cgi?id=795537">https://bugzilla.gnome.org/show_bug.cgi?id=795537</a>
One person suggested that a crash inside mesa should never happen, so I am
reporting it here as well.
One of the backtraces that I have starts like this:
Core was generated by `/usr/bin/gnome-shell'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007f74143eed33 in image_get_buffers (driDrawable=0x56353e8ca4d0,
format=4098, stamp=0x56353e8ca500, loaderPrivate=0x56353e8d4510, buffer_mask=1,
buffers=0x7ffd94a282c0)
at ../../../src/gbm/backends/dri/gbm_dri.c:132
#1 0x00007f7405c29741 in intel_update_image_buffers (drawable=0x56353e8ca4d0,
brw=0x56353e7a9980) at
../../../../../../src/mesa/drivers/dri/i965/brw_context.c:1751
#2 intel_update_renderbuffers (context=context@entry=0x56353e7c82d0,
drawable=drawable@entry=0x56353e8ca4d0) at
../../../../../../src/mesa/drivers/dri/i965/brw_context.c:1427
#3 0x00007f7405c29dc1 in intel_prepare_render (brw=brw@entry=0x56353e7a9980)
at ../../../../../../src/mesa/drivers/dri/i965/brw_context.c:1448
#4 0x00007f7405c2c012 in brw_prepare_drawing (max_index=4294967295,
min_index=0, index_bounds_valid=<optimized out>, ib=0x7ffd94a28430,
arrays=<optimized out>, ctx=0x56353e7a9980)
at ../../../../../../src/mesa/drivers/dri/i965/brw_draw.c:730
#5 brw_draw_prims (ctx=0x56353e7a9980, prims=0x7ffd94a28450, nr_prims=1,
ib=0x7ffd94a28430, index_bounds_valid=<optimized out>, min_index=<optimized
out>, max_index=<optimized out>,
gl_xfb_obj=0x0, stream=0, indirect=0x0) at
../../../../../../src/mesa/drivers/dri/i965/brw_draw.c:992
#6 0x00007f74059c1b59 in vbo_validated_drawrangeelements (ctx=<optimized out>,
mode=<optimized out>, index_bounds_valid=<optimized out>, start=0,
end=<optimized out>,
count=<optimized out>, type=5123, indices=0x0, basevertex=0,
numInstances=1, baseInstance=0) at ../../../src/mesa/vbo/vbo_exec_array.c:843
#7 0x00007f74059c252e in vbo_exec_DrawElements (mode=4, count=1302, type=5123,
indices=0x0) at ../../../src/mesa/vbo/vbo_exec_array.c:1001
The full version is attached.</pre>
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