Regression: Vertex Weight Mix crash on apply/undo when mesh has shape keys #109523

New Issue

Thomas Barlow · 2023-06-29T18:00:17+02:00

Thomas Barlow commented

2023-06-29 18:00:17 +02:00

System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 531.41

Blender Version
Broken: version: 3.4.0 Alpha, branch: master, commit date: 2022-09-09 22:58, hash: rB352d55b1c887
Worked: version: 3.4.0 Alpha, branch: master, commit date: 2022-09-09 00:25, hash: rB81558783e403

Short description of error
I'm getting a crash in a community addon when it applies a Vertex Weight Mix modifier to a mesh with shape keys.

No crash occurs with the addon when running Blender with --debug-memory, instead a lot of Memoryblock add_shapekey_layers: double free and Memoryblock free: pointer not in memlist are printed to the system console.

I have been unable to reproduce the exact scenario present in the addon in isolation, whereby a crash occurs when applying the modifier, but does not crash when --debug-memory is used. However, I have managed to produce similar crashes with Vertex Weight Mix that I'm guessing are related.

Exact steps for others to reproduce the error

Crash applying modifier (seems to always crash even with --debug-memory)

Start with a default cube
Add two shape keys (so there is the 'Basis' and one other shape key)
Add a Vertex Group
Add a Vertex Weight Mix modifier
Set the Vertex Group you created as both the A and B vertex group (it's not necessary for both A and B to be the same, the crash still occurs if you were to have added two vertex groups and set one as A and the other as B)
Apply the modifier
Crash with the following printed to the System Console:

Malloc returns null: len=2096855700656 in dupli_malloc, total 19523832
Error   : EXCEPTION_ACCESS_VIOLATION
Address : 0x00007FFB94071470
Module  : VCRUNTIME140.dll
Thread  : 000059d8

Crash on undo unless --debug-memory is used:

Open the attached .blend
Apply the Vertex Weight Mix modifier on the cube
1. When using --debug-memory, this also seems to make the mesh invisible unless the shape keys are removed
Undo
Crash occurs if not using --debug-memory, otherwise Memoryblock free: pointer not in memlist is printed once to the System Console. Nothing is printed to the System console if not using --debug-memory.

Crash on entering Edit mode after applying modifier (sometimes doesn't crash with --debug-memory):

Open the attached .blend
Apply the Vertex Weight Mix modifier on the cube
1. When using --debug-memory, this also seems to make the mesh invisible unless the shape keys are removed
Enter edit mode
Crash with the following printed to the System Console:

Error   : EXCEPTION_ACCESS_VIOLATION
Address : 0x00007FF664FA2674
Module  : blender.exe
Thread  : 00005840

**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 531.41 **Blender Version** Broken: version: 3.4.0 Alpha, branch: master, commit date: 2022-09-09 22:58, hash: `rB352d55b1c887` Worked: version: 3.4.0 Alpha, branch: master, commit date: 2022-09-09 00:25, hash: `rB81558783e403` **Short description of error** I'm getting a crash in a community addon when it applies a Vertex Weight Mix modifier to a mesh with shape keys. No crash occurs with the addon when running Blender with `--debug-memory`, instead a lot of `Memoryblock add_shapekey_layers: double free` and `Memoryblock free: pointer not in memlist` are printed to the system console. I have been unable to reproduce the exact scenario present in the addon in isolation, whereby a crash occurs when applying the modifier, but does not crash when `--debug-memory` is used. However, I have managed to produce similar crashes with Vertex Weight Mix that I'm guessing are related. **Exact steps for others to reproduce the error** Crash applying modifier (seems to always crash even with `--debug-memory`) 1. Start with a default cube 1. Add two shape keys (so there is the 'Basis' and one other shape key) 1. Add a Vertex Group 1. Add a Vertex Weight Mix modifier 1. Set the Vertex Group you created as both the A and B vertex group (it's not necessary for both A and B to be the same, the crash still occurs if you were to have added two vertex groups and set one as A and the other as B) 1. Apply the modifier 1. Crash with the following printed to the System Console: ``` Malloc returns null: len=2096855700656 in dupli_malloc, total 19523832 Error : EXCEPTION_ACCESS_VIOLATION Address : 0x00007FFB94071470 Module : VCRUNTIME140.dll Thread : 000059d8 ``` Crash on undo unless `--debug-memory` is used: 1. Open the attached .blend 1. Apply the Vertex Weight Mix modifier on the cube 1. When using `--debug-memory`, this also seems to make the mesh invisible unless the shape keys are removed 1. Undo 1. Crash occurs if not using `--debug-memory`, otherwise `Memoryblock free: pointer not in memlist` is printed once to the System Console. Nothing is printed to the System console if not using `--debug-memory`. Crash on entering Edit mode after applying modifier (sometimes doesn't crash with `--debug-memory`): 1. Open the attached .blend 1. Apply the Vertex Weight Mix modifier on the cube 1. When using `--debug-memory`, this also seems to make the mesh invisible unless the shape keys are removed 1. Enter edit mode 1. Crash with the following printed to the System Console: ``` Error : EXCEPTION_ACCESS_VIOLATION Address : 0x00007FF664FA2674 Module : blender.exe Thread : 00005840 ```

mix_weights_crash.blend

4.1 MiB

👍 1

Thomas Barlow added the

labels 2023-06-29 18:00:18 +02:00

Iliya Katushenock commented

2023-06-29 18:02:50 +02:00

Can confirm in last 4.0 debug build from scratch
Assertion failed: alignment < 1024, file F:\Blender_build\first\blender\intern\guardedalloc\intern\mallocn_lockfree_impl.c, line 290

Can confirm in last 4.0 debug build from scratch `Assertion failed: alignment < 1024, file F:\Blender_build\first\blender\intern\guardedalloc\intern\mallocn_lockfree_impl.c, line 290`

Iliya Katushenock added

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Regression: Vertex Weight Mix crash on apply/undo when mesh has shape keys #109523