SegFault missing slots in framebuffer

Submitted by Jeroen Bakker

Assigned to Default DRI bug account

Description

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

Start Blender
Go to edit mode (press tab)
Start Merge vertices tool (press ALT-M)
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

Version: git

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