Cycles crash with edit mode and simultaneous viewport and final render #93855

New Issue

Ehsan Nasri · 2021-12-08T08:02:23+01:00

Ehsan Nasri commented

2021-12-08 08:02:23 +01:00

graphics card: NVIDIA GeForce GTX 1060 6GB
Driver version: 497.09
Windows 10 Pro 64-bit 21H1
Cpu: Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz 3.40 GHz
Ram: 8.00 GB

Blender 3 Portable

Hi. When using the Blender 3 and Cycles in a Edit mode. The software closes automatically after closing the rendering window. There is no such problem in the Object Mode. There is a problem in both using the CPU and the graphics card.
In mode Solid and mode Material Previw this problem does not exist and only in mode Rendered this problem exists.
There is no such problem in Blender 3 Eevee mode.
There is no such problem in lower versions of the blender.

Steps to Reproduce

Open default scene
{nav Render Engine > Cycles}
Switch to edit mode
Change Viewport shading to Rendered
Render Image
Close the tab before it completes rendering

blender.crash.txt
blender_debug_output.txt
blender_system_info.txt
Rec 12-08-21-1.mp4

graphics card: NVIDIA GeForce GTX 1060 6GB Driver version: 497.09 Windows 10 Pro 64-bit 21H1 Cpu: Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz 3.40 GHz Ram: 8.00 GB Blender 3 Portable Hi. When using the Blender 3 and Cycles in a Edit mode. The software closes automatically after closing the rendering window. There is no such problem in the Object Mode. There is a problem in both using the CPU and the graphics card. In mode Solid and mode Material Previw this problem does not exist and only in mode Rendered this problem exists. There is no such problem in Blender 3 Eevee mode. There is no such problem in lower versions of the blender. **Steps to Reproduce** - Open default scene - {nav Render Engine > Cycles} - Switch to edit mode - Change Viewport shading to Rendered - Render Image - Close the tab before it completes rendering [blender.crash.txt](https://archive.blender.org/developer/F12716414/blender.crash.txt) [blender_debug_output.txt](https://archive.blender.org/developer/F12716271/blender_debug_output.txt) [blender_system_info.txt](https://archive.blender.org/developer/F12716275/blender_system_info.txt) [Rec 12-08-21-1.mp4](https://archive.blender.org/developer/F12708825/Rec_12-08-21-1.mp4)

Ehsan Nasri commented

2021-12-08 08:02:23 +01:00

Added subscriber: @nasri

Richard Antalik commented

2021-12-09 01:21:15 +01:00

Added subscriber: @iss

Richard Antalik commented

2021-12-09 01:21:15 +01:00

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

Richard Antalik commented

2021-12-09 01:21:15 +01:00

Can't reproduce crash here.

Please run file blender_debug_log.cmd from folder where blender.exe is located. After crash upload created files. Also check if .crash.txt file is mentioned at the bottom of debug log. If it is, upload that file too.

Can't reproduce crash here. Please run file `blender_debug_log.cmd` from folder where `blender.exe` is located. After crash upload created files. Also check if .crash.txt file is mentioned at the bottom of debug log. If it is, upload that file too.

Ehsan Nasri commented

2021-12-09 05:19:11 +01:00

Hi.

blender.crash.txt

blender_debug_output.txt

blender_system_info.txt

Hi. [blender.crash.txt](https://archive.blender.org/developer/F12716414/blender.crash.txt) [blender_debug_output.txt](https://archive.blender.org/developer/F12716271/blender_debug_output.txt) [blender_system_info.txt](https://archive.blender.org/developer/F12716275/blender_system_info.txt)

Pratik Borhade commented

2021-12-09 10:05:40 +01:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2021-12-09 10:13:30 +01:00

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

Pratik Borhade commented

2021-12-09 10:13:30 +01:00

I can confirm the crash on master (1552c92fb1e7)

To reproduce crash, I did:

Open default scene
{nav Render Engine > Cycles}
Switch to edit mode
Change Viewport shading to Rendered
Render Image
Close the tab before it completes rendering

I can confirm the crash on master (`1552c92fb1e7`) To reproduce crash, I did: - Open default scene - {nav Render Engine > Cycles} - Switch to edit mode - Change Viewport shading to Rendered - Render Image - Close the tab before it completes rendering

Brecht Van Lommel changed title from ~~Automatic closing of Blender 3 in the Cycles~~ to Cycles crash with edit mode and simultaneous viewport and final render

2021-12-09 19:34:20 +01:00

Michael commented

2021-12-17 11:51:45 +01:00

Added subscriber: @michael64

Michael commented

2021-12-17 11:51:45 +01:00

I could also reproduce this as described above.
In this case Blender crashes in BlenderSync::find_shader
The first line

    Shader *shader = (id) ? shader_map.find(id) : default_shader;

is executed, id is true, shader_map.find(id) is called but does not find it and returns NULL.
With D13607 which simply uses the default shader this issue might be fixed.

I was wondering if maybe a material might be replaced so I added an additional new green material to the cube
but after closing the render window while it was still rendering the cube was still green.

I could also reproduce this as described above. In this case Blender crashes in BlenderSync::find_shader The first line ``` Shader *shader = (id) ? shader_map.find(id) : default_shader; ``` is executed, id is true, shader_map.find(id) is called but does not find it and returns NULL. With [D13607](https://archive.blender.org/developer/D13607) which simply uses the default shader this issue might be fixed. I was wondering if maybe a material might be replaced so I added an additional new green material to the cube but after closing the render window while it was still rendering the cube was still green.

Ehsan Nasri commented

2021-12-22 03:07:04 +01:00

Hello. The problem still exists.

Sergey Sharybin commented

2022-01-11 14:27:33 +01:00

Added subscriber: @Sergey

Sergey Sharybin self-assigned this 2022-01-11 14:27:33 +01:00

Sergey Sharybin commented

2022-01-11 14:27:34 +01:00

The root of the issue is deeper than a missing null-pointer check. This is actually a heap-use-after-free. The shader is not suppoed to be nullptr in this case.