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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 --- - [r600g-evergreen][compute]Empty kernel execution causes crash"
href="https://bugs.freedesktop.org/show_bug.cgi?id=82671">82671</a>
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>[r600g-evergreen][compute]Empty kernel execution causes crash
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<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>damien.hilloulin@supelec.fr
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<th>Hardware</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Version</th>
<td>git
</td>
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<th>Component</th>
<td>Drivers/Gallium/r600
</td>
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<th>Product</th>
<td>Mesa
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=104687" name="attach_104687" title="Bug repro program source file">attachment 104687</a> <a href="attachment.cgi?id=104687&action=edit" title="Bug repro program source file">[details]</a></span>
Bug repro program source file
I gave a shot to opencl support on my evergreen card (cedar) with mesa git.
I noticed that with an empty kernel the program crash with:
evergreen_state.c:1827:evergreen_emit_vertex_buffers: Assertion `rbuffer'
failed.
I made a little debugging and I think that this is du to a bug in
evergreen_init_compute_state_functions from evergreen_compute.c .
The two concerned lines are
/* We always use at least one vertex buffer for parameters (id = 1)*/
ctx->cs_vertex_buffer_state.enabled_mask =
ctx->cs_vertex_buffer_state.dirty_mask = 0x2;
With an empty kernel there is in fact no vertex buffer used as far as I can
see.
By changing the two lines to
ctx->cs_vertex_buffer_state.enabled_mask =
ctx->cs_vertex_buffer_state.dirty_mask = 0x0;
It doesn't crash for me anymore.
However I am a total driver development noob so my interpretation (and
therefore fix) can be wrong.
You can find attacted the very small program to be able to cause the crash.</pre>
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