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SegFault missing slots in framebuffer

Submitted by Jeroen Bakker

Assigned to Default DRI bug account

Link to original bug (#111802)

Description

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

Version: git

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