Reproducable Crash in Blender 2.83 Beta: Combing Hair using Python #76131

New Issue

Alexander Meißner · 2020-04-26T21:17:33+02:00

2020-04-26 21:17:33 +02:00

System Information
Operating system: macOS 10.13.6 (High Sierra)
Graphics card: NVIDIA GeForce GT 650M

Exact steps for others to reproduce the error
Open the default scene, register the following operator and execute it:

class CrashByComb(bpy.types.Operator):
    bl_idname = 'particle.crash_by_comb'
    bl_label = 'Crash by Comb'

    def execute(self, context):
        bpy.ops.object.particle_system_add()
        bpy.context.object.particle_systems.active.settings.type = 'HAIR'
        bpy.ops.particle.particle_edit_toggle()
        bpy.context.scene.tool_settings.particle_edit.tool = 'COMB'
        bpy.ops.particle.brush_edit(stroke=[{'name': '', 'location': (0, 0, 0), 'mouse': (0, 0), 'pressure': 0, 'size': 0, 'pen_flip': False, 'time': 0, 'is_start': False}])
        return {'FINISHED'}

Stack Trace
blender.crash.txt

**System Information** Operating system: macOS 10.13.6 (High Sierra) Graphics card: NVIDIA GeForce GT 650M **Exact steps for others to reproduce the error** Open the default scene, register the following operator and execute it: ``` class CrashByComb(bpy.types.Operator): bl_idname = 'particle.crash_by_comb' bl_label = 'Crash by Comb' def execute(self, context): bpy.ops.object.particle_system_add() bpy.context.object.particle_systems.active.settings.type = 'HAIR' bpy.ops.particle.particle_edit_toggle() bpy.context.scene.tool_settings.particle_edit.tool = 'COMB' bpy.ops.particle.brush_edit(stroke=[{'name': '', 'location': (0, 0, 0), 'mouse': (0, 0), 'pressure': 0, 'size': 0, 'pen_flip': False, 'time': 0, 'is_start': False}]) return {'FINISHED'} ``` **Stack Trace** [blender.crash.txt](https://archive.blender.org/developer/F8496518/blender.crash.txt)

Alexander Meißner commented

2020-04-26 21:17:33 +02:00

Added subscriber: @Lichtso

Philipp Oeser commented

2020-04-27 11:23:54 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-04-27 11:23:54 +02:00

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

Philipp Oeser commented

2020-04-27 11:23:54 +02:00

Can confirm a crash

DRW_draw_depth_object calls DRW_mesh_batch_cache_create_requested with NULL scene, but that is accessed later on...

1   extract_task_create                   draw_cache_extract_mesh.c 4543 0x325a660      
2   mesh_buffer_cache_create_requested    draw_cache_extract_mesh.c 4704 0x325d504      
3   DRW_mesh_batch_cache_create_requested draw_cache_impl_mesh.c    1399 0x32150f6      
4   DRW_draw_depth_object                 draw_manager.c            2471 0x318fb3c      
5   ED_view3d_backbuf_depth_validate      view3d_draw.c             2226 0x3b4b455      
6   PE_set_view3d_data                    particle_edit.c           483  0x38462be      
7   brush_edit_init                       particle_edit.c           4524 0x3852680      
8   brush_edit_exec                       particle_edit.c           4775 0x38532b3      
9   wm_operator_invoke                    wm_event_system.c         1283 0x2ea310c      
10  wm_operator_call_internal             wm_event_system.c         1519 0x2ea38f2      
11  WM_operator_call_py                   wm_event_system.c         1619 0x2ea3b83      
12  pyop_call                             bpy_operator.c            268  0x351a5e8      
13  _PyMethodDef_RawFastCallKeywords                                     0x7ffff39d9c0e 
14  _PyCFunction_FastCallKeywords                                        0x7ffff39d9d43 
15  call_function                                                        0x7ffff3a0c203 
16  _PyEval_EvalFrameDefault                                             0x7ffff3a424ce 
17  _PyEval_EvalCodeWithName                                             0x7ffff39f9430 
18  _PyFunction_FastCallDict                                             0x7ffff39fab0e 
19  _PyObject_Call_Prepend                                               0x7ffff39cf8c6 
20  slot_tp_call                                                         0x7ffff3a8ff99

Can confirm a crash `DRW_draw_depth_object` calls `DRW_mesh_batch_cache_create_requested` with NULL scene, but that is accessed later on... ``` 1 extract_task_create draw_cache_extract_mesh.c 4543 0x325a660 2 mesh_buffer_cache_create_requested draw_cache_extract_mesh.c 4704 0x325d504 3 DRW_mesh_batch_cache_create_requested draw_cache_impl_mesh.c 1399 0x32150f6 4 DRW_draw_depth_object draw_manager.c 2471 0x318fb3c 5 ED_view3d_backbuf_depth_validate view3d_draw.c 2226 0x3b4b455 6 PE_set_view3d_data particle_edit.c 483 0x38462be 7 brush_edit_init particle_edit.c 4524 0x3852680 8 brush_edit_exec particle_edit.c 4775 0x38532b3 9 wm_operator_invoke wm_event_system.c 1283 0x2ea310c 10 wm_operator_call_internal wm_event_system.c 1519 0x2ea38f2 11 WM_operator_call_py wm_event_system.c 1619 0x2ea3b83 12 pyop_call bpy_operator.c 268 0x351a5e8 13 _PyMethodDef_RawFastCallKeywords 0x7ffff39d9c0e 14 _PyCFunction_FastCallKeywords 0x7ffff39d9d43 15 call_function 0x7ffff3a0c203 16 _PyEval_EvalFrameDefault 0x7ffff3a424ce 17 _PyEval_EvalCodeWithName 0x7ffff39f9430 18 _PyFunction_FastCallDict 0x7ffff39fab0e 19 _PyObject_Call_Prepend 0x7ffff39cf8c6 20 slot_tp_call 0x7ffff3a8ff99 ```

Philipp Oeser self-assigned this 2020-04-27 11:34:38 +02:00

Philipp Oeser commented

2020-04-27 11:34:38 +02:00

Caused by e82827bf6e

Caused by e82827bf6e

blender-admin commented

2020-04-27 11:37:20 +02:00

This issue was referenced by 4fd005fefb

This issue was referenced by 4fd005fefb014a8570747b1d043de7d610078b46

Philipp Oeser commented

2020-04-27 16:45:36 +02:00

Changed status from 'Confirmed' to: 'Resolved'