[Bug 104331] [r600g] Ogre demo "TutorialUAV01" crash at r600_decompress_color_images

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104331

            Bug ID: 104331
           Summary: [r600g] Ogre demo "TutorialUAV01" crash at
                    r600_decompress_color_images
           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: megwattt at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 136265
  --> https://bugs.freedesktop.org/attachment.cgi?id=136265&action=edit
Apitrace of the demo

This demo requires GLSL 430, so it will only works with mesa git on evergreen.
I have this crash with REDWOOD and JUNIPER chips. 

The demo works fine on others drivers (tested on radeonsi and intel).

I've got this while debugging with GDB:
"Thread 1 "Sample_Tutorial" received signal SIGSEGV, Segmentation fault.
r600_decompress_color_images (rctx=rctx at entry=0x7c82b0, 
    images=images at entry=0x7c92b0) at r600_blit.c:420
420                     r600_blit_decompress_color(&rctx->b.b, tex,"

I've attached an apitrace. The crash occurs at frame 0, call 2983.

The other Ogre UAV demo (TutorialUAV02), does not have this problem.

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