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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 - Simply linking against libOpenCL.so tries accessing the GPU"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106572">106572</a>
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<th>Summary</th>
<td>Simply linking against libOpenCL.so tries accessing the GPU
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>git
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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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>Mesa core
</td>
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>bugs.freedesktop@haasn.xyz
</td>
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
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<p>
<div>
<pre>$ echo 'int main() {}' > test.c && gcc -o test test.c -lOpenCL && strace -e
open ./test
open("/dev/dri", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 4
open("/dev/dri", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 4
open("/dev/dri", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 4
open("/dev/dri", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 4
open("/sys/dev/char/226:128/device/drm",
O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 4
open("/sys/dev/char/226:128/device/drm",
O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 5
open("/dev/dri", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 5
open("/etc/nsswitch.conf", O_RDONLY|O_CLOEXEC) = 5
open("/etc/passwd", O_RDONLY|O_CLOEXEC) = 5
open("/sys/devices/system/cpu/online", O_RDONLY|O_CLOEXEC) = 5
open("/sys/dev/char/226:128/device/drm",
O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 5
open("/sys/dev/char/226:128/device/drm",
O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 5
open("/sys/dev/char/226:128/device/drm",
O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 5
+++ exited with 0 +++
This behavior surprises me because e.g. libGL.so does not have the same sort of
behavior, and neither do libvulkan.so or other third party implementations of
OpenGL/OpenCL.
Merely *linking* to a library should not cause any runtime GPU access. Normally
I'd expect this kind of loading logic to happen when the CL device itself is
initialized, similar to how OpenGL's GPU-specific drivers only get initialized
when calling `glXCreateContext` and ditto for vkCreateInstance /
vkCreateDevice.
Context: <a href="https://bugs.gentoo.org/show_bug.cgi?id=656086">https://bugs.gentoo.org/show_bug.cgi?id=656086</a>
Since this behavior surprises me, I'm also filing a bug here, even though the
issue is technically downstream. Maybe we could get some elaboration.</pre>
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