Bug 111802

Summary: SegFault missing slots in framebuffer
Product: Mesa Reporter: Jeroen Bakker <jeroen>
Component: Drivers/Gallium/radeonsiAssignee: Default DRI bug account <dri-devel>
Status: RESOLVED MOVED QA Contact: Default DRI bug account <dri-devel>
Severity: not set    
Priority: not set    
Version: git   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:

Description Jeroen Bakker 2019-09-24 13:47:35 UTC 
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
Comment 1 GitLab Migration User 2019-09-25 18:50:56 UTC 
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.

You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/1432.

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