Subsurface scattering OpenCL Crash #57774

New Issue

Alaska · 2018-11-11T06:19:35+01:00

Alaska commented

2018-11-11 06:19:35 +01:00

System Information:
CPU: Ryzen 5 2600
GPU: RX 570 4gb (Radeon Software Version: 18.11.1)
OS: Windows 10 home

Blender Version:
Broken: blender-2.80-2c2c996a1b2 (November 9th)
Worked: Blender 2.79b and Blender 2.79 Master

Short description of error:
Whenever I use a Principaled BSDF with Subsurface Scatting enabled in Cycles and the pixel count is high enough (Changing the viewport pixel size to 8x or 4x on my 1440x900 monitor resolves this issue), Blender will freeze and the screen will flash black (probably from a GPU driver crash) then Blender will remain white and "Not Responding". I would write this off as a driver issue, but seeing as these issues don't occur in Blender 2.79b or 2.79 master, it seems to be an issue with Blender 2.8 not the driver (I may be wrong on this assumption).

The error I receive from Blender after the screen flickering with the --debug-cycles argument is:

AL lib: (EE) ALCmmdevPlayback_mixerProc: Failed to get padding: 0x88890004

If I understand correctly, this is something to do with Audio and may simply be Blender interfacing with the GPU after it crashes, but I'll leave it in here just in cause I'm wrong on this assumption.

Note: Final renders don't appear to be affected by this crash. However, if the scene is official rendered (F12) then we switch back to viewport, the freezing and crashing are no longer there. However, artifacts appear:

Exact steps for others to reproduce the error:
Here's a file to test with:
Subsurface Scattering Crash.blend

**System Information:** CPU: Ryzen 5 2600 GPU: RX 570 4gb (Radeon Software Version: 18.11.1) OS: Windows 10 home **Blender Version:** Broken: blender-2.80-2c2c996a1b2 (November 9th) Worked: Blender 2.79b and Blender 2.79 Master **Short description of error:** Whenever I use a Principaled BSDF with Subsurface Scatting enabled in Cycles and the pixel count is high enough (*Changing the viewport pixel size to 8x or 4x on my 1440x900 monitor resolves this issue*), Blender will freeze and the screen will flash black (*probably from a GPU driver crash*) then Blender will remain white and "Not Responding". I would write this off as a driver issue, but seeing as these issues don't occur in Blender 2.79b or 2.79 master, it seems to be an issue with Blender 2.8 not the driver (*I may be wrong on this assumption*). The error I receive from Blender after the screen flickering with the --debug-cycles argument is: ``` AL lib: (EE) ALCmmdevPlayback_mixerProc: Failed to get padding: 0x88890004 ``` If I understand correctly, this is something to do with Audio and may simply be Blender interfacing with the GPU after it crashes, but I'll leave it in here just in cause I'm wrong on this assumption. Note: Final renders don't appear to be affected by this crash. However, if the scene is official rendered (F12) then we switch back to viewport, the freezing and crashing are no longer there. However, artifacts appear: ![Artifacts.PNG](https://archive.blender.org/developer/F5490044/Artifacts.PNG) **Exact steps for others to reproduce the error:** Here's a file to test with: [Subsurface Scattering Crash.blend](https://archive.blender.org/developer/F5488400/Subsurface_Scattering_Crash.blend)

Alaska commented

2018-11-11 06:19:35 +01:00

Added subscriber: @Alaska

Philipp Oeser commented

2018-11-12 13:02:33 +01:00

Added subscribers: @brecht, @lichtwerk

Brecht Van Lommel was assigned by Philipp Oeser

2018-11-12 13:02:33 +01:00

Philipp Oeser commented

2018-11-12 13:02:33 +01:00

@brecht: not sure if you have access to such hardware, mind having a look?

Alaska commented

2018-11-15 05:37:27 +01:00

I conducted another test on my Ryzen 5 2500u with Vega 8 graphics and found it experienced a similar issue. However, in the case of this GPU, a "Blue screen of death" occured with the message VIDEO_TDR_FAILURE. However, in the case of this GPU, the same issue occurs for Blender 2.79 master.

I believe the issue experienced on this system is probably more related to the low-endness of the system than the Sub-surface scattering. But it brought up the question, is the issue experienced with the RX 570 just the GPU timing out due to the complexity of the Sub-surface scattering material? With this in mind I conducted another test: A 2.79 Master scene with an indoor scene with a glass sphere, mirror, and multiple objects with sub-surface scattering. And surprisingly the GPU didn't crash.

I still believe it's an issue with 2.8 and probably Open CL.

I conducted another test on my Ryzen 5 2500u with Vega 8 graphics and found it experienced a similar issue. However, in the case of this GPU, a "Blue screen of death" occured with the message VIDEO_TDR_FAILURE. However, in the case of this GPU, the same issue occurs for Blender 2.79 master. I believe the issue experienced on this system is probably more related to the low-endness of the system than the Sub-surface scattering. But it brought up the question, is the issue experienced with the RX 570 just the GPU timing out due to the complexity of the Sub-surface scattering material? With this in mind I conducted another test: A 2.79 Master scene with an indoor scene with a glass sphere, mirror, and multiple objects with sub-surface scattering. And surprisingly the GPU didn't crash. I still believe it's an issue with 2.8 and probably Open CL.

Brecht Van Lommel commented

2019-01-09 11:41:18 +01:00

Can you try testing with the latest builds?

I was never able to reproduce this problem (even on a 4K monitor), but there have been some fixes in this area.

Can you try testing with the latest builds? I was never able to reproduce this problem (even on a 4K monitor), but there have been some fixes in this area.

blender-admin commented

2019-01-09 16:38:04 +01:00

This issue was referenced by blender/cycles@761d23db6c

This issue was referenced by blender/cycles@761d23db6c7ce8e14014864e5e9fba32838320a2

blender-admin commented

2019-01-09 16:38:04 +01:00

This issue was referenced by b7fb3296c1

This issue was referenced by b7fb3296c101bf408455352ec9784a8870672c81

Brecht Van Lommel commented

2019-01-09 16:43:54 +01:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2019-01-09 16:43:54 +01:00

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Subsurface scattering OpenCL Crash #57774