[Bug 96488] [r600g]OpenCL driver causes segfault in ImageMagick's Histogram kernel

[bugzilla-daemon at freedesktop.org]

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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