crash associated with UV editing #85680

New Issue

Paul Danielson · 2021-02-16T07:15:52+01:00

Paul Danielson commented

2021-02-16 07:15:52 +01:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 452.06

Blender Version
Broken: version: 2.91.2, branch: master, commit date: 2021-01-19 16:15, hash: 5be9ef4177
Worked: 2.90.1, sort of

Short description of error
Blender crashes when the UV Editor is displayed if a particular object is in Edit mode.

Exact steps for others to reproduce the error
The blend file will open to the Modelling tab, with "Wall Proto" selected in Edit Mode. Switch to the UV Editing tab. Blender will crash.

At least some other objects can have their UVs edited without problems. This blend file was originally created in 2.90.1. 2.90.1 had it's own issue with this project, again apparently associated with the UV Editing tab. The view in the 3D viewport in any other tab was correct. The view in the 3D viewport in the UV Editing tab sometimes failed to display a number of objects. The missing objects would still be selected if selected in another tab, but would not be visible. Restarting Blender fixed the display problem. It may be that the problem in 2.90.1 has corrupted the database and created the problem in 2.91.2, but when the viewport in 2.90.1 is working and I edit the Wall Proto object in the UV Editing tab Blender does not crash.

modular_dungeon 291.blend

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 452.06 **Blender Version** Broken: version: 2.91.2, branch: master, commit date: 2021-01-19 16:15, hash: `5be9ef4177` Worked: 2.90.1, sort of **Short description of error** Blender crashes when the UV Editor is displayed if a particular object is in Edit mode. **Exact steps for others to reproduce the error** The blend file will open to the Modelling tab, with "Wall Proto" selected in Edit Mode. Switch to the UV Editing tab. Blender will crash. At least some other objects can have their UVs edited without problems. This blend file was originally created in 2.90.1. 2.90.1 had it's own issue with this project, again apparently associated with the UV Editing tab. The view in the 3D viewport in any other tab was correct. The view in the 3D viewport in the UV Editing tab sometimes failed to display a number of objects. The missing objects would still be selected if selected in another tab, but would not be visible. Restarting Blender fixed the display problem. It may be that the problem in 2.90.1 has corrupted the database and created the problem in 2.91.2, but when the viewport in 2.90.1 is working and I edit the Wall Proto object in the UV Editing tab Blender does not crash. [modular_dungeon 291.blend](https://archive.blender.org/developer/F9807193/modular_dungeon_291.blend)

Paul Danielson commented

2021-02-16 07:15:52 +01:00

Added subscriber: @MichaelDanielson

Falk David commented

2021-02-16 09:54:45 +01:00

Added subscriber: @filedescriptor

Falk David commented

2021-02-16 09:54:45 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Falk David commented

2021-02-16 09:54:45 +01:00

~~Could you try the latest Alpha from https://builder.blender.org/download/? This might be a duplicate of #85495 which has been fixed (3e55d7d605).~~

~~Could you try the latest Alpha from https://builder.blender.org/download/? This might be a duplicate of #85495 which has been fixed (3e55d7d605).~~

Falk David commented

2021-02-16 09:57:33 +01:00

Changed status from 'Needs User Info' to: 'Needs Triage'

Falk David commented

2021-02-16 09:57:33 +01:00

I was able to reproduce the issue on the latest 2.93.0 Alpha, branch: master, commit date: 2021-02-16 08:05, hash: 36814ddc94.

I was able to reproduce the issue on the latest 2.93.0 Alpha, branch: master, commit date: 2021-02-16 08:05, hash: `36814ddc94`.

Falk David commented

2021-02-16 09:58:12 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Falk David self-assigned this 2021-02-16 09:58:12 +01:00

Falk David commented

2021-02-16 09:58:12 +01:00

Investigating...

Falk David commented

2021-02-16 10:38:19 +01:00

Added subscribers: @fclem, @ideasman42

Falk David commented

2021-02-16 10:38:19 +01:00

The crash is happening because mr->extract_type in blender/source/blender/draw/intern/draw_cache_extract_mesh.c:4028 is MR_EXTRACT_MESH. Only MR_EXTRACT_BMESH and MR_EXTRACT_MAPPED are handled, everything else crashes because of an BLI_assert(0);.

@fclem or @ideasman42 do you have any ideas why that case is not handled?

The crash is happening because `mr->extract_type` in `blender/source/blender/draw/intern/draw_cache_extract_mesh.c:4028` is `MR_EXTRACT_MESH`. Only `MR_EXTRACT_BMESH` and `MR_EXTRACT_MAPPED` are handled, everything else crashes because of an `BLI_assert(0);`. @fclem or @ideasman42 do you have any ideas why that case is not handled?

Clément Foucault commented

2021-02-16 13:29:00 +01:00

Added subscriber: @Jeroen-Bakker