[Mesa-dev] [Bug 105291] r600 [CEDAR]: GPU stalls when running shadertoy "ladybug"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105291

            Bug ID: 105291
           Summary: r600 [CEDAR]: GPU stalls when running shadertoy
                    "ladybug"
           Product: Mesa
           Version: git
          Hardware: Other
               URL: https://www.shadertoy.com/view/4tByz3
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: gw.fossdev at gmail.com
        QA Contact: mesa-dev at lists.freedesktop.org
                CC: russianneuromancer at ya.ru

Running the shader toy example 

  https://www.shadertoy.com/view/4tByz3

causes a GPU stall on CEDAR:
radeon 0000:06:00.0: ring 0 stalled for more than 10360msec
radeon 0000:06:00.0: GPU lockup (current fence id 0x00000000000005c1 
                     last fence id 0x0000000000000644 on ring 0)
radeon 0000:06:00.0: Saved 4178 dwords of commands on ring 0.
...

[drm:r600_ib_test [radeon]] *ERROR* radeon: fence wait timed out.
[drm:radeon_ib_ring_tests [radeon]] *ERROR* radeon: failed testing 
                  IB on GFX ring (-110).

The same shader toy runs fine on BARTS.

Considering that this shader runs at 1.6 FPS on BARTS the timeout could also
happen because it simply take to long to process a shader stage (i.e. one
shader is 32750 DW long (optimized) and has a few long nested loops).

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