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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - OpenCL enqueueReadBuffer returns trash"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101952">101952</a>
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<th>Summary</th>
<td>OpenCL enqueueReadBuffer returns trash
</td>
</tr>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>17.1
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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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>major
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Mesa core
</td>
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>janpieter.sollie@dommel.be
</td>
</tr>
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=133073" name="attach_133073" title="command log with GDB showing the results of a library switch from amdgpu-pro to mesa">attachment 133073</a> <a href="attachment.cgi?id=133073&action=edit" title="command log with GDB showing the results of a library switch from amdgpu-pro to mesa">[details]</a></span>
command log with GDB showing the results of a library switch from amdgpu-pro to
mesa
Hardware:
cpu: 2x Opteron 6276
RAM: 128GB
Video card: on-board matrox G200 and AMD Nano (Fiji)
Software:
Linux: 4.10.17/DRM 3.9.0 (gentoo)
LLVM: 4.0.0
gcc: 7.1.0
mesa: 17.1.5
problem:
when I render a program using the AMD pro libraries, the clEnqueueReadBuffer
command returns the correct output. When I use the mesa libs, the output is
trash. A write to the buffer is performed in both cases. before, the whole
buffer is 0, and after:
AMD: { 0, 0, 0, 255 }
MESA: {4177618488, 4177945519, 16468310, 12159302}
for both cases, the standard amdgpu kernel module was used.
incorrect clReadBuffer results make the system unusable.</pre>
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