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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 - GPU hangs if a shader uses a barrier and a single-plane rep of a multiplane image"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105770">105770</a>
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<th>Summary</th>
<td>GPU hangs if a shader uses a barrier and a single-plane rep of a multiplane image
</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>
</tr>
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<th>OS</th>
<td>All
</td>
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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
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<th>Component</th>
<td>Drivers/Vulkan/intel
</td>
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<th>Assignee</th>
<td>intel-3d-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>atomnuker@gmail.com
</td>
</tr>
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
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<th>CC</th>
<td>jason@jlekstrand.net
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<p>
<div>
<pre>Hi,
If a shader uses a barrier after filling in some workgroup-shared memory from a
single-plane representation of a multi-plane image (not sure if that's
related), the GPU will hang.
<span class="quote">> [67542.848596] i915 0000:00:02.0: Resetting rcs0 after gpu hang</span >
The shader looks like:
#version 460
layout (set = 0, binding = 0) uniform sampler2D input_img;
layout (set = 0, binding = 1, rgba8) uniform writeonly image2D output_img;
#define FILTER_RADIUS (ivec2(4, 4))
#define CACHE_SIZE (ivec2(gl_WorkGroupSize) + FILTER_RADIUS*2)
shared vec4 cache[AREA(CACHE_SIZE)];
void main()
{
ivec2 d;
const ivec2 pos = ivec2(gl_GlobalInvocationID.xy);
const ivec2 w = ivec2(gl_WorkGroupSize);
const ivec2 l = ivec2(gl_LocalInvocationID.xy);
for (d.y = l.y; d.y < CACHE_SIZE.y; d.y += w.y) {
for (d.x = l.x; d.x < CACHE_SIZE.x; d.x += w.x) {
const ivec2 np = pos + d - l - FILTER_RADIUS;
cache[d.y*CACHE_SIZE.x + d.x] = texture(input_img, np);
}
}
barrier();
vec4 avg = vec4(0.0f);
ivec2 start = ivec2(0);
ivec2 end = FILTER_RADIUS*2 + 1;
for (d.y = start.y; d.y < end.y; d.y++)
for (d.x = start.x; d.x < end.x; d.x++)
avg += cache[(l.y + d.y)*CACHE_SIZE.x + l.x + d.x];
avg /= (end - start).x * (end - start).y;
imageStore(output_img, pos, avg);
}
Removing the barrier() will make the shader execute fine (with incorrect output
of course).
Using an image2D as an input or sampling it like above makes no difference, the
GPU still hangs.
As a test case, compile <a href="https://github.com/atomnuker/FFmpeg/tree/exp_vulkan">https://github.com/atomnuker/FFmpeg/tree/exp_vulkan</a>
with --enable-vulkan and --enable-libshaderc and run "./ffmpeg_g
-init_hw_device "vulkan=vk:0" -i <input> -filter_hw_device vk -vf
format=yuv420p,hwupload,unsharp_vulkan -f null -".</pre>
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