Segfault with bmesh API on a mesh with a shape key #77584

New Issue

Eelco Dolstra · 2020-06-07T22:58:55+02:00

Eelco Dolstra commented

2020-06-07 22:58:55 +02:00

System Information
Operating system: Linux (NixOS 20.03)
Graphics card: NVIDIA GeForce RTX 2070

Blender Version
Broken: 2.83, 2.90.0 alpha (2e52b3206c)
Worked: 2.82a and older

Short description of error

The following script crashes in Blender 2.83, but worked in previous versions:

import bpy
import bmesh
mesh = bpy.data.meshes.new("Test")
obj = bpy.data.objects.new("Test", mesh)
obj.shape_key_add(name="Basis")
bpy.context.scene.collection.objects.link(obj)
bpy.context.view_layer.objects.active = obj
bpy.ops.object.mode_set(mode="EDIT")
bm = bmesh.from_edit_mesh(obj.data)
vertex = bm.verts.new((2.0, 2.0, 2.0))
bpy.ops.object.mode_set(mode='OBJECT')
bpy.ops.object.mode_set(mode='EDIT') # <-- crashes here
bpy.ops.object.mode_set(mode='OBJECT')

Removing obj.shape_key_add(name="Basis") makes the segfault disappear.

Here is a stack trace from gdb (from running blender -P ./script.py):

- 0  0x0000000000fa8ed6 in BM_mesh_bm_from_me ()
- 1  0x0000000000c7966e in BKE_mesh_to_bmesh_ex ()
- 2  0x0000000000c796bb in BKE_mesh_to_bmesh ()
- 3  0x00000000013aa97c in EDBM_mesh_make ()
- 4  0x00000000013f25a9 in ED_object_editmode_enter_ex ()
- 5  0x00000000013f292a in ?? ()
- 6  0x0000000000ec6a93 in ?? ()
- 7  0x0000000000ec6d07 in ?? ()
- 8  0x0000000000ec720a in WM_operator_name_call_ptr ()
- 9  0x00000000013f12ef in ?? ()
- 10 0x0000000000ec6a93 in ?? ()
- 11 0x0000000000ec7370 in WM_operator_call_py ()
- 12 0x0000000001207303 in ?? ()
- 13 0x000000000570f339 in _PyMethodDef_RawFastCallKeywords ()
- 14 0x000000000570f3f5 in _PyCFunction_FastCallKeywords ()
- 15 0x0000000000c11b20 in _PyEval_EvalFrameDefault ()
- 16 0x00000000057c0d8c in _PyEval_EvalCodeWithName ()
- 17 0x000000000570ecc0 in _PyFunction_FastCallDict ()
- 18 0x000000000570ff0d in _PyObject_Call_Prepend ()
- 19 0x000000000576b801 in ?? ()
- 20 0x000000000570f514 in _PyObject_FastCallKeywords ()
- 21 0x0000000000c0b4c5 in _PyEval_EvalFrameDefault ()
- 22 0x00000000057c0d8c in _PyEval_EvalCodeWithName ()
- 23 0x00000000057c0ebe in PyEval_EvalCodeEx ()
- 24 0x00000000057c0eeb in PyEval_EvalCode ()
- 25 0x00000000057f40e2 in PyRun_FileExFlags ()
- 26 0x00000000011f3681 in ?? ()
- 27 0x0000000000c135b8 in _start ()

Maybe this has something to do with https://developer.blender.org/D7818?

Exact steps for others to reproduce the error

In default scene go to the Text Editor
Copy and paste script above
Run script
Crash
Removing obj.shape_key_add(name="Basis") makes the segfault disappear.

**System Information** Operating system: Linux (NixOS 20.03) Graphics card: NVIDIA GeForce RTX 2070 **Blender Version** Broken: 2.83, 2.90.0 alpha (2e52b3206cc6) Worked: 2.82a and older **Short description of error** The following script crashes in Blender 2.83, but worked in previous versions: ``` import bpy import bmesh mesh = bpy.data.meshes.new("Test") obj = bpy.data.objects.new("Test", mesh) obj.shape_key_add(name="Basis") bpy.context.scene.collection.objects.link(obj) bpy.context.view_layer.objects.active = obj bpy.ops.object.mode_set(mode="EDIT") bm = bmesh.from_edit_mesh(obj.data) vertex = bm.verts.new((2.0, 2.0, 2.0)) bpy.ops.object.mode_set(mode='OBJECT') bpy.ops.object.mode_set(mode='EDIT') # <-- crashes here bpy.ops.object.mode_set(mode='OBJECT') ``` Removing `obj.shape_key_add(name="Basis")` makes the segfault disappear. Here is a stack trace from gdb (from running `blender -P ./script.py`): ``` - 0 0x0000000000fa8ed6 in BM_mesh_bm_from_me () - 1 0x0000000000c7966e in BKE_mesh_to_bmesh_ex () - 2 0x0000000000c796bb in BKE_mesh_to_bmesh () - 3 0x00000000013aa97c in EDBM_mesh_make () - 4 0x00000000013f25a9 in ED_object_editmode_enter_ex () - 5 0x00000000013f292a in ?? () - 6 0x0000000000ec6a93 in ?? () - 7 0x0000000000ec6d07 in ?? () - 8 0x0000000000ec720a in WM_operator_name_call_ptr () - 9 0x00000000013f12ef in ?? () - 10 0x0000000000ec6a93 in ?? () - 11 0x0000000000ec7370 in WM_operator_call_py () - 12 0x0000000001207303 in ?? () - 13 0x000000000570f339 in _PyMethodDef_RawFastCallKeywords () - 14 0x000000000570f3f5 in _PyCFunction_FastCallKeywords () - 15 0x0000000000c11b20 in _PyEval_EvalFrameDefault () - 16 0x00000000057c0d8c in _PyEval_EvalCodeWithName () - 17 0x000000000570ecc0 in _PyFunction_FastCallDict () - 18 0x000000000570ff0d in _PyObject_Call_Prepend () - 19 0x000000000576b801 in ?? () - 20 0x000000000570f514 in _PyObject_FastCallKeywords () - 21 0x0000000000c0b4c5 in _PyEval_EvalFrameDefault () - 22 0x00000000057c0d8c in _PyEval_EvalCodeWithName () - 23 0x00000000057c0ebe in PyEval_EvalCodeEx () - 24 0x00000000057c0eeb in PyEval_EvalCode () - 25 0x00000000057f40e2 in PyRun_FileExFlags () - 26 0x00000000011f3681 in ?? () - 27 0x0000000000c135b8 in _start () ``` Maybe this has something to do with https://developer.blender.org/D7818? **Exact steps for others to reproduce the error** - In default scene go to the Text Editor - Copy and paste script above - Run script Crash Removing `obj.shape_key_add(name="Basis")` makes the segfault disappear.

Eelco Dolstra commented

2020-06-07 22:58:55 +02:00

Added subscriber: @edolstra

Germano Cavalcante commented

2020-06-09 19:35:18 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

blender-admin commented

2020-09-13 10:11:38 +02:00

This issue was referenced by 39af4d8bfe

This issue was referenced by 39af4d8bfe389a3392d2f5e0af22fccafa1064c6

blender-admin commented

2020-09-13 10:11:38 +02:00

This issue was referenced by 46bdfcab10

This issue was referenced by 46bdfcab10fad857baffdbcfc1179838aed5660d

blender-admin commented

2020-09-13 10:11:38 +02:00

This issue was referenced by 1e186cea7c

This issue was referenced by 1e186cea7c2b1409d50070f040a571ac17290bbf

Campbell Barton commented

2020-09-13 10:15:54 +02:00

Added subscriber: @ideasman42

Campbell Barton commented

2020-09-13 10:15:54 +02:00

This crashes with the following steps too (not Python).

Enter edit-mode on the default cube.
Select all vertices and delete them.
Exit edit-mode.
Add a shape-key.
Exit edit mode.
Enter edit mode (crash).

This crashes with the following steps too (not Python). - Enter edit-mode on the default cube. - Select all vertices and delete them. - Exit edit-mode. - Add a shape-key. - Exit edit mode. - Enter edit mode (crash).

Campbell Barton commented

2020-09-13 10:22:11 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Campbell Barton closed this issue

2020-09-13 10:22:11 +02:00

Campbell Barton self-assigned this 2020-09-13 10:22:11 +02:00

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Segfault with bmesh API on a mesh with a shape key #77584