[Bug 99488] [r600g]OpenCL driver causes process to hang in ImageMagick's Gaussian Blur kernel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99488

            Bug ID: 99488
           Summary: [r600g]OpenCL driver causes process to hang in
                    ImageMagick's Gaussian Blur kernel
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (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

(Bug number three. I can almost taste victory...)

If I compile ImageMagick with OpenCL support, the current version will hang
when I invoke the Gaussian blur operation. More specifically, the CPU will run
at 100%, and memory consumed by the process will increase indefinitely at 19 MB
per second, but nothing will happen.

The blur operation is done internally for many other operations, so this issue
is more crippling than it first appears.

To reproduce:

1. Get the current tree of ImageMagick from GitHub:
https://github.com/ImageMagick/ImageMagick

2. Compile it with OpenCL and HDRI support (--enable-opencl --enable-hdri
flags).

3. Get an image, and try to perform a simple Gaussian blur:

convert input.png -blur 0x20 output.png

4. The hang will occur... at least, on my system.

I mentioned this in another bug, and was told that on different hardware than
mine (I have a Radeon HD 5700, which is an Evergreen chipset) all of the
ImageMagick self-tests pass.

The source code for all OpenCL kernels is in
MagickCore/accelerate-kernels-private.h. Several functions are involved with
blurring, and unfortunately it's difficult to identify the source of the hang.
I would be happy to provide debugging information if I could be advised on how
to collect it.

LLVM version: r292714
Mesa version: commit bb5db5564

ImageMagick version: commit 43a09ba75 (Note: the next git revision was broken
by upstream)

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