Overrides: Crash with animated IK control on linked armature #80078

New Issue

System Information
Operating system: Linux-5.4.0-7634-generic-x86_64-with-debian-bullseye-sid 64 Bits
Graphics card: GeForce RTX 2080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.100

Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-07-28 11:49, hash: 2a52c2d001

Short description of error
After linking and library overriding a complex rig, various actions can cause a crash with this backtrace:
backtrace1

Trying to simplify the rig further has been a nightmare. With 24 attempts over the past hour, all I managed to do while still getting the crashes is delete all but one mesh object - but the backtrace is going on about IK functions, so I don't understand why the mesh would be relevant. Even so, removing other bones also seems to make the crash go away... I am very confused.

Exact steps for others to reproduce the error

Rig file: sprite.rig.blend
Link CH-sprite collection in a fresh project
Make library override
Animate the "IK-MSTR-P-Wrist.L" bone with a couple of keyframes
Save and restart blender
Do actions such as playing animation, changing action, select, deselect all, box select, Save As
It should crash.

00_override_crash.mp4

CC @mont29 Sorry I couldn't simplify the file any further.

**System Information** Operating system: Linux-5.4.0-7634-generic-x86_64-with-debian-bullseye-sid 64 Bits Graphics card: GeForce RTX 2080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.100 **Blender Version** Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-07-28 11:49, hash: `2a52c2d001` **Short description of error** After linking and library overriding a complex rig, various actions can cause a crash with this backtrace: [backtrace1](https://archive.blender.org/developer/F8808240/backtrace1) Trying to simplify the rig further has been a nightmare. With 24 attempts over the past hour, all I managed to do while still getting the crashes is delete all but one mesh object - but the backtrace is going on about IK functions, so I don't understand why the mesh would be relevant. Even so, removing other bones also seems to make the crash go away... I am very confused. **Exact steps for others to reproduce the error** - Rig file: [sprite.rig.blend](https://archive.blender.org/developer/F8808249/sprite.rig.blend) - Link CH-sprite collection in a fresh project - Make library override - Animate the "IK-MSTR-P-Wrist.L" bone with a couple of keyframes - Save and restart blender - Do actions such as playing animation, changing action, select, deselect all, box select, Save As - It should crash. [00_override_crash.mp4](https://archive.blender.org/developer/F8808261/00_override_crash.mp4) CC @mont29 Sorry I couldn't simplify the file any further.

Added subscribers: @mont29, @Mets

Added subscriber: @lichtwerk

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

OK, can confirm, but I havent been able to reproduce this from scratch in a simple file, but this seems to be related to the bone layers all being protected

Now absolutely no expert in rigging, but for me, the issues go away if I disable the Layer Proxy Protection, can you confirm @Mets ?

OK, can confirm, but I havent been able to reproduce this from scratch in a simple file, but this seems to be related to the bone layers all being protected ![image.png](https://archive.blender.org/developer/F8810329/image.png) Now absolutely no expert in rigging, but for me, the issues go away if I disable the Layer Proxy Protection, can you confirm @Mets ?

Yeah, pretty sure there is some issue with Layer Proxy Protection and Overrides (I am not even sure how this is supposed to work with Overrides -- will have to read a bit more), but I guess this is in better hands if @mont29 has a look...

Turning off layer protection does not seem to make a difference on my end:

video-2020-08-25_16.39.45.mp4

Turning off layer protection does not seem to make a difference on my end: [video-2020-08-25_16.39.45.mp4](https://archive.blender.org/developer/F8810526/video-2020-08-25_16.39.45.mp4)

Hm, OK, not sure what is going on then, was fixing it on my side.
What happens when you disable protected layers in the source file after animating the main file?

Hm, OK, not sure what is going on then, was fixing it on my side. What happens when you disable protected layers in the source file **after** animating the main file?

This issue was referenced by 812c234377

This issue was referenced by 812c234377302fdcb6b6bf8c7715507f9831525f

This issue was referenced by df8a63bb9c

This issue was referenced by df8a63bb9c0a7090562e3f33c5da80d5dafa386d

@Mets can you please confirm that the proposed patch fixes the issue for you as well? Thanks.

Changed status from 'Confirmed' to: 'Resolved'

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Overrides: Crash with animated IK control on linked armature #80078