https://bugs.freedesktop.org/show_bug.cgi?id=96488
Bug ID: 96488
Summary: [r600g]OpenCL driver causes segfault in ImageMagick's
Histogram kernel
Product: Mesa
Version: git
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Gallium/r600
Assignee: dri-devel at lists.freedesktop.org
Reporter: nixscripter at gmail.com
QA Contact: dri-devel at lists.freedesktop.org
Created attachment 124469
--> https://bugs.freedesktop.org/attachment.cgi?id=124469&action=edit
Histogram kernel backtrace
If I compile ImageMagick with OpenCL support, the current version segfaults
when I attempt to do any operation which computes a histogram. This is actually
done frequently internally, so it's more crippling than it first appears.
To reproduce:
1. Get the current latest ImageMagick from GitHub:
https://github.com/ImageMagick/ImageMagick
2. Compile it with OpenCL support (--enable-opencl flag)
3. Get an image, and try to equalize its colors (based on the histogram):
convert input.png -equalize output.png
4. The segfault will occur
LLVM version: r272184
Mesa version: commit d5491a8
ImageMagick version: ade0d8e
The source code for the Histogram kernel is in
MagickCore/accelerate-kernels-private.h, starting on line 1283.
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