[Bug 77907] New: OpenCL test 'Arithm/Absdiff.Mat/20' from OpenCV hangs HD5470M

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77907

          Priority: medium
            Bug ID: 77907
          Assignee: dri-devel at lists.freedesktop.org
           Summary: OpenCL test 'Arithm/Absdiff.Mat/20' from OpenCV hangs
                    HD5470M
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: brunojimen at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Drivers/Gallium/r600
           Product: Mesa

The effects are that when running that test, the screen freezes for a while,
then goes to black, then shows back my desktop, happening this some times.

After some debugging, the hang seems to occur with the compute shader sent to
the GPU, as the system freezes when it waits for the GPU to finish.

My system is Arch Linux with:
- AMD CEDAR 5470M
- kernel 3.14.1-1
- llvm at revision 207118
- mesa at commit 352e06d
- opencv at commit bb4199b

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