[Bug 111802] SegFault missing slots in framebuffer

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=111802

            Bug ID: 111802
           Summary: SegFault missing slots in framebuffer
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: not set
          Priority: not set
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: jeroen@blender.org
        QA Contact: dri-devel@lists.freedesktop.org

This fault has been detected when using Blender (2.80 or master branch)
Steps to reproduce the error:

1. Start Blender
2. Go to edit mode (press tab)
3. Start Merge vertices tool (press ALT-M)
4. Select any mode (press ENTER)

And a segmentation fault happens.
This has been tested on Mesa 18.2.2, 19.0.8 and 19.3.0~dev.

The root cause is that you have a framebuffer with multiple color slots with
empty slots in between. If there is an empty color slot between the color
slots, all textures after this slot are apparently skipped/discarded.

Our work around is to reuse empty slots with other slots.
`gpu_framebuffer_update_attachments_and_fill_empty_slots`
in
https://developer.blender.org/diffusion/B/browse/master/source/blender/gpu/intern/gpu_framebuffer.c$429-483

This issue also existed in the official AMD drivers, but has been solved to our
knowledge.

https://developer.blender.org/T70187

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