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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - KWin crashed when Alt+Tab-ing through open windows"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106153">106153</a>
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<th>Summary</th>
<td>KWin crashed when Alt+Tab-ing through open windows
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>17.3
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
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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>Drivers/Gallium/radeonsi
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>bernhardu@mailbox.org
</td>
</tr>
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<th>QA Contact</th>
<td>dri-devel@lists.freedesktop.org
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=138954" name="attach_138954" title="More infos of KCrash/gdb and glxinfo.">attachment 138954</a> <a href="attachment.cgi?id=138954&action=edit" title="More infos of KCrash/gdb and glxinfo.">[details]</a></span>
More infos of KCrash/gdb and glxinfo.
This might be a duplicate of #102423 or #103234.
(But did not want to pollute these if they were unrelated.)
...
#4 0x00007f78f8a4c793 in KCrash::defaultCrashHandler (sig=11) at ./src/kcra...
#5 <signal handler called> ...
#6 si_emit_draw_packets (sctx=sctx@entry=0x5600dec29f30, info=info@entry=0x...
#7 0x00007f78c278d2b0 in si_draw_vbo (ctx=0x5600dec29f30, info=0x5600dec6b1...
#8 0x00007f78c24efd03 in tc_call_draw_vbo (pipe=<optimized out>, payload=0x...
#9 0x00007f78c24eddff in tc_batch_execute (thread_index=0, job=0x5600dec6a8...
...
(gdb) up
#6 si_emit_draw_packets (sctx=sctx@entry=0x5600dec29f30, info=info@entry=0x...
713 index_max_size = (indexbuf->width0 - index_offset) /
At this point it looks like variable indexbuf is NULL.
"bt full" would suggest this too:
#7 0x00007f78c278d2b0 in si_draw_vbo (ctx=0x5600dec29f30, info=0x5600dec6b1...
...
indexbuf = 0x0
So I cannot reproduce this and was hit just once.
But it could be related to the not so long Qt 5.10 update in Debian testing.
I took a core dump if there are more questions.
All debug symbols are available as far as I see.
Related could also be that the core file is of a size of 3.5 GB so that
might have led to the NULL pointer.
Attached is a file containing the more infos of KCrash/gdb and glxinfo.</pre>
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