Cycles crash on specific frame render with motion blur enabled #77040

New Issue

Brent Thurston · 2020-05-25T03:46:53+02:00

Brent Thurston commented

2020-05-25 03:46:53 +02:00

System Information
Operating system: Darwin-18.6.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon R9 M395X OpenGL Engine ATI Technologies Inc. 4.1 ATI-2.9.26

Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: 375c7dc4ca

Short description of error
Cycles render crashes on frame 35 of attached file with motion blur enabled. Turning off motion blur resolves the issue. Additionally, frames before 35 render blank or incorrectly but do not cause a crash. This crash does not happen when rendering with Eevee. This bug was encountered on the Mac and Linux versions of 2.82a, but not the Windows 10 version.

Exact steps for others to reproduce the error
Simply render frame 35 using Cycles with motion blur enabled. Half of a blank frame will render and then Blender will crash.

Thanks very much for your work : )

cycles render crash.blend

**System Information** Operating system: Darwin-18.6.0-x86_64-i386-64bit 64 Bits Graphics card: AMD Radeon R9 M395X OpenGL Engine ATI Technologies Inc. 4.1 ATI-2.9.26 **Blender Version** Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: `375c7dc4ca` **Short description of error** Cycles render crashes on frame 35 of attached file with motion blur enabled. Turning off motion blur resolves the issue. Additionally, frames before 35 render blank or incorrectly but do not cause a crash. This crash does not happen when rendering with Eevee. This bug was encountered on the Mac and Linux versions of 2.82a, but not the Windows 10 version. **Exact steps for others to reproduce the error** Simply render frame 35 using Cycles with motion blur enabled. Half of a blank frame will render and then Blender will crash. Thanks very much for your work : ) [cycles render crash.blend](https://archive.blender.org/developer/F8551602/cycles_render_crash.blend)

Brent Thurston commented

2020-05-25 03:46:53 +02:00

Added subscriber: @pictureboy

Alaska commented

2020-05-25 05:37:32 +02:00

Added subscriber: @Alaska

Alaska commented

2020-05-25 05:37:32 +02:00

I personally had this issue on another project. It occurs when motion blur is enabled and a object is changing it's scale from 0 to a non-zero value on the frame you're rendering.

This issue persists in Blender 2.83 and 2.90 with builds from 22 of May.

I remember seeing a task a short while ago discussing this issue, but I'm having trouble finding it again. I will leave the decision of what to do with this task up to the developers.

Edit: I believe #75441 was the task I was looking for. It doesn't describe a crash, but it produces rendering artifacts.

I personally had this issue on another project. It occurs when motion blur is enabled and a object is changing it's scale from 0 to a non-zero value on the frame you're rendering. This issue persists in Blender 2.83 and 2.90 with builds from 22 of May. I remember seeing a task a short while ago discussing this issue, but I'm having trouble finding it again. I will leave the decision of what to do with this task up to the developers. Edit: I believe #75441 was the task I was looking for. It doesn't describe a crash, but it produces rendering artifacts.

Brent Thurston commented

2020-05-25 07:37:16 +02:00

Good to know. Thanks for the info, Alaska : )

Alaska commented

2020-05-25 07:49:34 +02:00

@pictureboy I realized I never gave an explanation for how I worked around the issue.

In the project I worked on, I actually keyframed the render visibility of the objects so they would only be accounted for in rendering if they were a non-zero scale. This avoided the crashing entirely.

@pictureboy I realized I never gave an explanation for how I worked around the issue. In the project I worked on, I actually keyframed the render visibility of the objects so they would only be accounted for in rendering if they were a non-zero scale. This avoided the crashing entirely.

Brent Thurston commented

2020-05-25 07:55:57 +02:00

That's a workable solution, kudos. I'm liking the Blender community. : )

Germano Cavalcante commented

2020-05-26 16:45:51 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-05-26 16:45:51 +02:00

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

Germano Cavalcante commented

2020-05-26 16:45:51 +02:00

I could not reproduce the problem here?
Do you render with GPU or CPU?
Can you try with the latest daily build? https://builder.blender.org/download/

Operating system: Windows-10-10.0.18941 64 Bits
Graphics card: Radeon (TM) RX 480 Graphics ATI Technologies Inc. 4.5.13586 Core Profile Context 19.50.01.05 26.20.15001.5006

I could not reproduce the problem here? Do you render with GPU or CPU? Can you try with the latest daily build? https://builder.blender.org/download/ ---- **Operating system:** Windows-10-10.0.18941 64 Bits **Graphics card:** Radeon (TM) RX 480 Graphics ATI Technologies Inc. 4.5.13586 Core Profile Context 19.50.01.05 26.20.15001.5006

Brent Thurston commented

2020-05-26 17:03:28 +02:00

I was rendering with CPU on a Mac. The crash also occurred on the 2.83 beta. As mentioned earlier, the same file rendered on a Windows machine did not exhibit the crash.

Hope this helps.

I was rendering with CPU on a Mac. The crash also occurred on the 2.83 beta. As mentioned earlier, the same file rendered on a Windows machine did not exhibit the crash. Hope this helps.

Germano Cavalcante commented

2020-05-26 17:26:16 +02:00

Changed status from 'Needs User Info' to: 'Needs Developer To Reproduce'

Alaska commented

2020-05-28 00:04:33 +02:00

Adding Linux as @pictureboy reported that this issue also occurs on Linux.

I am also able to reproduce the issue on Linux but booting into Windows and testing I am unable to reproduce the issue (as discussed by @mano-wii and @pictureboy)

Rendered using a Ryzen 9 3900X.

Adding Linux as @pictureboy reported that this issue also occurs on Linux. I am also able to reproduce the issue on Linux but booting into Windows and testing I am unable to reproduce the issue (as discussed by @mano-wii and @pictureboy) Rendered using a Ryzen 9 3900X.

Brecht Van Lommel commented

2020-07-08 13:59:30 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2020-07-08 13:59:30 +02:00

Changed status from 'Needs Developer To Reproduce' to: 'Resolved'

Brecht Van Lommel closed this issue

2020-07-08 13:59:30 +02:00

Brecht Van Lommel self-assigned this 2020-07-08 13:59:30 +02:00

Brecht Van Lommel commented

2020-07-08 13:59:30 +02:00

This was fixed by e936633.

This was fixed by e936633.

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Cycles crash on specific frame render with motion blur enabled #77040