Crash on sculpting brush stroke #39
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Reference: Triager-bot/blender-bug-reports#39
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Original bug report: https://projects.blender.org/blender/blender/issues/157213
System Information
Operating system: Linux-6.19.9-200.fc43.x86_64-x86_64-with-glibc2.42 64 Bits, WAYLAND UI
Graphics card: AMD Radeon 780M Graphics (RADV PHOENIX) Advanced Micro Devices radv Mesa 25.3.6 Vulkan Backend
Blender Version
Broken: version: 5.2.0 Alpha, branch: main, commit date: 2026-04-10 23:18, hash:
2229dfdf760cWorked: (newest version of Blender that worked as expected)
Short description of error
Report is clear
LLM Reasoning
Got it, let's see. The bug report has a title "Crash on sculpting brush stroke" and the body describes using a brush on empty space in sculpt mode leading to a crash. The steps to reproduce are there: use a brush on empty space in sculpt mode. So does it clearly describe the issue? Yes, because the description is concise and the reproduction step is clear. Even though there's system info, we ignore that. The key part is the error description and steps, which are present and clear. So the answer should be Yes.
JSON Data
{
"llm_judgement": true,
"processing_time": 7.2311819999999996
}
Report is specific
LLM Reasoning
Got it, let's analyze the bug report. The title is "Crash on sculpting brush stroke" and the body describes using a brush in sculpt mode leading to a crash. The example for specific issues mentions "crashing while using a specific feature while rendering"—here, the specific feature is the sculpting brush stroke. So this is about a specific issue because it's tied to a particular action (using a brush in sculpt mode) rather than a vague "crashing while rendering". Wait, but let me check again. The user says specific bug reports are about a specific issue like crashing during a specific feature use. The report here is about crashing when using the sculpting brush stroke, which is a specific action. So it's Specific? Or wait, maybe I'm overcomplicating. Let's see: the example for generic is "Crashing while rendering" (vague), and specific is "Crashing while using a specific feature while rendering". Here, the issue is crashing when using the sculpting brush stroke—so that's a specific feature use. So the answer should be Specific? Wait, but let me check the bug report again. The short description says "Use a brush on empty space in sculpt mode -> Crash". That's a specific action (using a brush in sculpt mode) leading to crash. So yes, it's a specific issue. Therefore, the answer is Specific.
JSON Data
{
"llm_judgement": true,
"processing_time": 15.236535
}
Report flagged as NOT a duplicate by LLM
Regression: crash when changing brushes in a specific file
https://projects.blender.org/blender/blender/issues/139617
System Information
Operating system: Linux-6.12.10-76061203-generic-x86_64-with-glibc2.35 64 Bits, X11 UI
Graphics card: NVIDIA GeForce RTX 4060 NVIDIA Corporation NVIDIA 570.133.07 Vulkan Backend
Blender Version
Broken: version: 4.5.0 Alpha, branch: main, commit date: 2025-05-25 21:22, hash:
6bd750bc01fcWorked: 4.4
Short description of error
When you change brushes in Sculpt mode, Blender crashes.
Exact steps for others to reproduce the error
Open the attached .blend file, go to sculpt mode, press g to change the active brush to grab > Blender crashes
Based on the attached file
LLM Reasoning
Got it, let's analyze these two bug reports. First, look at the description and steps.
Bug report 1: Crash when using a brush on empty space in sculpt mode. Steps are "Use a brush on empty space in sculpt mode -> Crash".
Bug report 2: Crash when changing brushes in sculpt mode (specifically changing to grab brush) in a specific file. Steps involve opening a .blend, going to sculpt, pressing g to change brush.
The key differences: Report 1 is about using a brush on empty space (any brush?), Report 2 is about changing brushes (specific action of switching, and requires a specific file). The triggers are different—Report 1 is using the brush, Report 2 is changing the brush. So they're not the same issue. Therefore, answer is No.
JSON Data
{
"llm_judgement": false,
"processing_time": 10.413587999999999,
"duplicate_report_number": "139617"
}
Report flagged as NOT a duplicate by LLM
blender crash with sculpt mode when i was using the grab brush
https://projects.blender.org/blender/blender/issues/140950
System Information
Operating system: Windows-10-10.0.22631-SP0 64 Bits
Graphics card: NVIDIA Corporation NVIDIA GeForce RTX 4070 Ti SUPER NVIDIA 576.80
Blender Version
Broken: version: 5.0.0 Alpha, Commit date: 2025-06-24 09:54, hash:
383c8860a2d9Worked: (newest version of Blender that worked as expected)
Short description of error
I was scuplting and using the grab brush,
Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]
LLM Reasoning
Got it, let's analyze these two bug reports. First, look at the description and steps.
Bug report 1: Crash when using a brush in sculpt mode on empty space. Steps are "Use a brush on empty space in sculpt mode -> Crash".
Bug report 2: Crash with grab brush in sculpt mode. The short description says using grab brush while sculpting. But the exact steps aren't fully provided, but the key is the action (grab brush) vs general brush in bug 1.
Wait, the first one is a general brush on empty space, the second is specifically the grab brush. Are these the same? Let's check. The first report's issue is any brush causing crash when used on empty space. The second is grab brush causing crash. But maybe the underlying cause could be similar, but the steps are different (general vs specific brush). Also, system info differs (Linux vs Windows, AMD vs NVIDIA), but that might not matter for duplication if the steps are same. But the steps: bug 1 is "use a brush on empty space", bug 2 is "using grab brush". So the actions are different. Therefore, they are not the same issue. So answer is No.
JSON Data
{
"llm_judgement": false,
"processing_time": 14.26901,
"duplicate_report_number": "140950"
}
Report flagged as NOT a duplicate by LLM
Grease pencil: Sculpt crash
https://projects.blender.org/blender/blender/issues/151256
System Information
Operating system: Windows-10-10.0.26200-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 4090 Laptop GPU NVIDIA Corporation NVIDIA 561.09 Vulkan Backend
Blender Version
Broken: version: 5.1.0 Alpha, branch: main, commit date: 2025-12-06 16:44, hash:
8f1f6a1c39efWorked: 5.0
Worked: 4.5
Short description of error
In the attached file sculpting crashes blender. Problem goes away if we switch to another sculpt tool, then back to the one selected
Exact steps for others to reproduce the error
Open attached file and sculpt the lines with selected tool
LLM Reasoning
Got it, let's analyze these two bug reports. First, look at the description and steps.
Bug report 1: Crash when using a brush on empty space in sculpt mode. Steps are "Use a brush on empty space in sculpt mode -> Crash".
Bug report 2: Grease pencil sculpt crash. The short description says sculpting crashes, and steps involve opening an attached file and sculpting lines with the selected tool. Also, switching tools fixes it temporarily.
The key differences: Bug 1 is about using a brush on empty space (general sculpt mode), Bug 2 is specific to Grease Pencil sculpting and involves an attached file. The contexts are different—Bug 1 is general sculpt mode, Bug 2 is Grease pencil. So they're not the same issue. Therefore, the answer is No.
JSON Data
{
"llm_judgement": false,
"processing_time": 10.423463,
"duplicate_report_number": "151256"
}
Report flagged as NOT a duplicate by LLM
Assertion on opening Brush context menu
https://projects.blender.org/blender/blender/issues/143959
System Information
Operating system: Linux-6.8.0-65-generic-x86_64-with-glibc2.35 64 Bits, WAYLAND UI
Graphics card: Mesa Intel(R) Graphics (RPL-U) Intel 4.6 (Core Profile) Mesa 23.2.1-1ubuntu3.1~22.04.3 Opengl Backend
Blender Version
Broken: version: 5.0.0 Alpha, branch: main, commit date: 2025-08-04 17:57, hash:
8133f7aa1371Worked: (newest version of Blender that worked as expected)
Short description of error
Crash on Brush asset Context Menu opening
Exact steps for others to reproduce the error
Thanks a lot !
LLM Reasoning
Got it, let's analyze these two bug reports. First, look at the description and steps.
Bug report 1: The issue is crashing when using a brush in sculpt mode on empty space. Steps are use a brush in sculpt mode -> crash.
Bug report 2: The issue is an assertion (crash) when opening the Brush context menu. Steps are open default startup, go to Texture Paint workspace, right-click a brush asset -> crash/assert.
The descriptions and steps are different. One is about using a brush in sculpt mode, the other is about opening a context menu for a brush. So they're not the same issue. Therefore, the answer is No.
JSON Data
{
"llm_judgement": false,
"processing_time": 9.110057000000001,
"duplicate_report_number": "143959"
}
Report flagged as NOT a duplicate by LLM
Sculpt Mode - Brush assets and custom settings cause crashes.
https://projects.blender.org/blender/blender/issues/148915
System Information
Operating system: Windows-10-10.0.26100-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 5080 Laptop GPU/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 572.84 Opengl Backend
Blender Version
Broken: version: 5.0.0 Beta, branch: blender-v5.0-release, commit date: 2025-10-27 23:00, hash:
6152909af043Worked: 4.5
Short description of error
When any sculpting brush has Size Pressure and Stabilize Stroke enabled, copying the asset, saving it, closing the software, and then restarting the software to use the corresponding brush will cause a crash.
The following file contains brush assets saved to the file.
Exact steps for others to reproduce the error
1.Enable Size Pressure and Stabilize Stroke for the brush
2.Copy the brush as an asset
3.Restart the software
4.Use the brush and it crashes
LLM Reasoning
Got it, let's analyze these two bug reports. First, look at the description and steps to reproduce.
Bug Report 1: The issue is crashing when using a sculpting brush on empty space in sculpt mode. Steps are simple—use a brush on empty space, crash.
Bug Report 2: The issue is crashes related to brush assets with specific settings (Size Pressure and Stabilize Stroke) after copying the asset, saving, restarting, then using the brush. So the steps involve asset handling, specific brush settings, and a restart sequence.
The core issues are different. Bug 1 is about any brush on empty space causing crash, while Bug 2 is about crashes when using a saved brush asset with certain settings after a restart. The triggers and steps don't match. So they're not the same issue.
JSON Data
{
"llm_judgement": false,
"processing_time": 10.98982,
"duplicate_report_number": "148915"
}