Crash in pose mode using a driver on bendy bone Segments. #81218

New Issue

Nirban · 2020-09-26T22:45:47+02:00

Nirban commented

2020-09-26 22:45:47 +02:00

System Information
Operating system: Windows 10
Graphics card: NVIDIA GeForce 940M (2 GB DDR3L dedicated)

Blender Version
Broken: 2.90.1 (September 23,2020)

Short description of error
When a driver is added to the Segments of a bendy bone in pose mode. Blender crashes while changing the variable to increase the segments.
(Crash occurs when the variable is changed very quickly. Might not happen the first time)

Exact steps for others to reproduce the error
*Open attached blend file.
*Move the bone in it's X axis in the positive direction to increase the segments of the bone.
*Move the bone very quickly. Might not crash in first or second try
bendybug.blend

Thanks.

**System Information** Operating system: Windows 10 Graphics card: NVIDIA GeForce 940M (2 GB DDR3L dedicated) **Blender Version** Broken: 2.90.1 (September 23,2020) **Short description of error** When a driver is added to the Segments of a bendy bone in pose mode. Blender crashes while changing the variable to increase the segments. (Crash occurs when the variable is changed very quickly. Might not happen the first time) **Exact steps for others to reproduce the error** *Open attached blend file. *Move the bone in it's X axis in the positive direction to increase the segments of the bone. *Move the bone very quickly. Might not crash in first or second try [bendybug.blend](https://archive.blender.org/developer/F8925890/bendybug.blend) Thanks.

Nirban commented

2020-09-26 22:45:47 +02:00

Added subscriber: @nirban

Richard Antalik commented

2020-10-01 20:13:06 +02:00

Added subscriber: @iss

Richard Antalik commented

2020-10-01 20:13:06 +02:00

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

Richard Antalik commented

2020-10-01 20:13:06 +02:00

Can confirm this, I am getting various backtraces mostly around depsgraph and threading routines. ASAN builds don't work for me for some reason, will look later when I find problem with ASAN

Jacques Lucke commented

2020-10-05 17:31:11 +02:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2020-10-05 17:31:11 +02:00

I couldn't reproduce this in a debug build yet, so might be threading related.
It should be noted that there is a dependency cycle in this file.

I couldn't reproduce this in a debug build yet, so might be threading related. It should be noted that there is a dependency cycle in this file. ![bendy_bones_depsgraph.svg](https://archive.blender.org/developer/F8958220/bendy_bones_depsgraph.svg)

Sybren A. Stüvel self-assigned this 2020-10-05 18:17:29 +02:00

Sybren A. Stüvel commented

2020-10-05 18:31:57 +02:00

I can reproduce the crash, and it's indeed a threading issue, as it doesn't crash with blender -t 1.

I can reproduce the crash, and it's indeed a threading issue, as it doesn't crash with `blender -t 1`.

blender-admin commented

2020-10-06 17:49:57 +02:00

This issue was referenced by 3f2b1f1b66

This issue was referenced by 3f2b1f1b667d00494b01ed4b9d65196f45eb75d3

blender-admin commented

2020-10-06 17:49:57 +02:00

This issue was referenced by d43e3f34d2

This issue was referenced by d43e3f34d26daca4f2b0f4c524a35a98cc85d1ce

Sybren A. Stüvel commented

2020-10-06 17:55:53 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Sybren A. Stüvel closed this issue

2020-10-06 17:55:53 +02:00

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Crash in pose mode using a driver on bendy bone Segments. #81218