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/i...

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

https://developer.blender.org/T70187