bmesh.ops.triangulate causes crash #51730

New Issue

Matthew Trescott · 2017-06-07T01:55:47+02:00

Matthew Trescott commented

2017-06-07 01:55:47 +02:00

System Information
Arch Linux 64-bit
GPU: Radeon HD 3200
(Triple buffering enabled to work around flickering for Linux versions)

Blender Version
Broken:

2.78c—Date: 2017-02-24 14:33—Hash: e92f2352830—Branch: mkpkg (distribution package)
2.78—Date: 2017-06-05 06:09—Hash: 81d7ff8476 (from builder.blender.org with & without software GL)
2.78c—Date: 2017-02-24 14:33—Hash: e92f235283 (Windows x64 via Wine Compatibility Layer)

Using bmesh.ops.triangulate seems to cause a crash (see instructions below).
Here is the backtrace from the builder.blender.org version:

(gdb) run
Starting program: /home/matthewtrescott/Downloads/blender-2.78-81d7ff84769-linux-glibc219-x86_64/blender 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7ffff38e2700 (LWP 5951)]
[New Thread 0x7ffff30e1700 (LWP 5952)]
[New Thread 0x7ffff28e0700 (LWP 5953)]
[New Thread 0x7ffff20df700 (LWP 5954)]
Read prefs: /home/matthewtrescott/.config/blender/2.78/config/userpref.blend
[New Thread 0x7fffee984700 (LWP 5957)]
[Thread 0x7fffee984700 (LWP 5957) exited]
[New Thread 0x7fffee984700 (LWP 5958)]
[New Thread 0x7ffff4d33700 (LWP 5959)]
[New Thread 0x7fffddbff700 (LWP 5961)]
[Thread 0x7fffddbff700 (LWP 5961) exited]
[New Thread 0x7fffd5ba5700 (LWP 5963)]
[New Thread 0x7fffd4b66700 (LWP 5964)]
found bundled python: /home/matthewtrescott/Downloads/blender-2.78-81d7ff84769-linux-glibc219-x86_64/2.78/python
[New Thread 0x7fffd1bae700 (LWP 5965)]
[New Thread 0x7fffd13ad700 (LWP 5966)]
[New Thread 0x7fffd0bac700 (LWP 5967)]
[New Thread 0x7fffcf69f700 (LWP 5985)]
[Thread 0x7fffcf69f700 (LWP 5985) exited]
Info: Total files 0 | Changed 0 | Failed 0

Thread 1 "blender" received signal SIGSEGV, Segmentation fault.
0x00000000012d1a17 in BM_face_at_index ()
(gdb) bt
- 0  0x00000000012d1a17 in BM_face_at_index ()
- 1  0x0000000000e06edd in draw_dm_faces_sel__setDrawOptions ()
- 2  0x0000000001448011 in emDM_drawMappedFaces ()
- 3  0x0000000000e088d3 in draw_dm_faces_sel.isra ()
- 4  0x0000000000e110bf in draw_em_fancy ()
- 5  0x0000000000e194fc in draw_object ()
- 6  0x0000000000de655f in ED_view3d_draw_depth ()
- 7  0x0000000000deefdd in ED_view3d_autodist ()
- 8  0x0000000000def392 in ED_view3d_cursor3d_position ()
- 9  0x0000000000def463 in ED_view3d_cursor3d_update ()
- 10 0x0000000000def58d in view3d_cursor3d_invoke ()
- 11 0x0000000000d13951 in wm_operator_invoke ()
- 12 0x0000000000d14ced in wm_handler_operator_call ()
- 13 0x0000000000d15178 in wm_handlers_do_intern ()
- 14 0x0000000000d15608 in wm_handlers_do ()
- 15 0x0000000000d15af5 in wm_event_do_handlers ()
- 16 0x0000000000d0cd08 in WM_main ()
- 17 0x0000000000cccfa0 in main ()

Exact steps for others to reproduce the error
Running the following commands in the Python console in the attached .blend will cause Blender to crash as soon as you click on the window:

import bmesh;
cur_mesh = bmesh.from_edit_mesh(bpy.context.active_object.data);
cur_face = cur_mesh.faces[0];
bmesh.ops.triangulate(cur_mesh, faces = [cur_face]);

bug.blend

**System Information** Arch Linux 64-bit GPU: Radeon HD 3200 (Triple buffering enabled to work around flickering for Linux versions) **Blender Version** Broken: - 2.78c—Date: 2017-02-24 14:33—Hash: e92f2352830—Branch: mkpkg (distribution package) - 2.78—Date: 2017-06-05 06:09—Hash: 81d7ff84769 (from builder.blender.org with & without software GL) - 2.78c—Date: 2017-02-24 14:33—Hash: e92f235283 (Windows x64 via Wine Compatibility Layer) Using bmesh.ops.triangulate seems to cause a crash (see instructions below). Here is the backtrace from the builder.blender.org version: ``` (gdb) run Starting program: /home/matthewtrescott/Downloads/blender-2.78-81d7ff84769-linux-glibc219-x86_64/blender [Thread debugging using libthread_db enabled] Using host libthread_db library "/usr/lib/libthread_db.so.1". [New Thread 0x7ffff38e2700 (LWP 5951)] [New Thread 0x7ffff30e1700 (LWP 5952)] [New Thread 0x7ffff28e0700 (LWP 5953)] [New Thread 0x7ffff20df700 (LWP 5954)] Read prefs: /home/matthewtrescott/.config/blender/2.78/config/userpref.blend [New Thread 0x7fffee984700 (LWP 5957)] [Thread 0x7fffee984700 (LWP 5957) exited] [New Thread 0x7fffee984700 (LWP 5958)] [New Thread 0x7ffff4d33700 (LWP 5959)] [New Thread 0x7fffddbff700 (LWP 5961)] [Thread 0x7fffddbff700 (LWP 5961) exited] [New Thread 0x7fffd5ba5700 (LWP 5963)] [New Thread 0x7fffd4b66700 (LWP 5964)] found bundled python: /home/matthewtrescott/Downloads/blender-2.78-81d7ff84769-linux-glibc219-x86_64/2.78/python [New Thread 0x7fffd1bae700 (LWP 5965)] [New Thread 0x7fffd13ad700 (LWP 5966)] [New Thread 0x7fffd0bac700 (LWP 5967)] [New Thread 0x7fffcf69f700 (LWP 5985)] [Thread 0x7fffcf69f700 (LWP 5985) exited] Info: Total files 0 | Changed 0 | Failed 0 Thread 1 "blender" received signal SIGSEGV, Segmentation fault. 0x00000000012d1a17 in BM_face_at_index () (gdb) bt - 0 0x00000000012d1a17 in BM_face_at_index () - 1 0x0000000000e06edd in draw_dm_faces_sel__setDrawOptions () - 2 0x0000000001448011 in emDM_drawMappedFaces () - 3 0x0000000000e088d3 in draw_dm_faces_sel.isra () - 4 0x0000000000e110bf in draw_em_fancy () - 5 0x0000000000e194fc in draw_object () - 6 0x0000000000de655f in ED_view3d_draw_depth () - 7 0x0000000000deefdd in ED_view3d_autodist () - 8 0x0000000000def392 in ED_view3d_cursor3d_position () - 9 0x0000000000def463 in ED_view3d_cursor3d_update () - 10 0x0000000000def58d in view3d_cursor3d_invoke () - 11 0x0000000000d13951 in wm_operator_invoke () - 12 0x0000000000d14ced in wm_handler_operator_call () - 13 0x0000000000d15178 in wm_handlers_do_intern () - 14 0x0000000000d15608 in wm_handlers_do () - 15 0x0000000000d15af5 in wm_event_do_handlers () - 16 0x0000000000d0cd08 in WM_main () - 17 0x0000000000cccfa0 in main () ``` **Exact steps for others to reproduce the error** Running the following commands in the Python console in the attached .blend will cause Blender to crash as soon as you click on the window: ``` import bmesh; cur_mesh = bmesh.from_edit_mesh(bpy.context.active_object.data); cur_face = cur_mesh.faces[0]; bmesh.ops.triangulate(cur_mesh, faces = [cur_face]); ``` [bug.blend](https://archive.blender.org/developer/F624393/bug.blend)

Matthew Trescott commented

2017-06-07 01:55:47 +02:00

Changed status to: 'Open'

Matthew Trescott commented

2017-06-07 01:55:47 +02:00

Added subscriber: @MTres19

Joel Godin commented

2017-06-07 03:58:46 +02:00

Added subscriber: @FloridaJo

Joel Godin commented

2017-06-07 03:58:46 +02:00

crash file from osx.

bug.crash.txt

crash file from osx. [bug.crash.txt](https://archive.blender.org/developer/F623667/bug.crash.txt)

matali23 commented

2017-06-07 09:51:07 +02:00

Added subscriber: @matali23

matali23 commented

2017-06-07 09:51:07 +02:00

I can confirm the crash on Windows 7 x64 with latest master, but please reatach the .blend with the script in text editor. And add "import bpy" at the top for other to test out without manual work.

Matthew Trescott commented

2017-06-07 17:10:20 +02:00

I updated the .blend as you requested.

Bastien Montagne commented

2017-06-08 09:41:12 +02:00

Added subscriber: @mont29

Bastien Montagne commented

2017-06-08 09:41:12 +02:00

Changed status from 'Open' to: 'Archived'

Bastien Montagne closed this issue

2017-06-08 09:41:12 +02:00

Bastien Montagne self-assigned this 2017-06-08 09:41:12 +02:00

Bastien Montagne commented

2017-06-08 09:41:13 +02:00

No bug here, you need to update edit mesh after you changed it in bmesh, correct and working script:

import bpy
import bmesh
cur_mesh = bmesh.from_edit_mesh(bpy.context.active_object.data)
cur_face = cur_mesh.faces[0]
bmesh.ops.triangulate(cur_mesh, faces = [cur_face])
bmesh.update_edit_mesh(bpy.context.active_object.data, tessface=True, destructive=True)

No bug here, you need to update edit mesh after you changed it in bmesh, correct and working script: ```lang=python import bpy import bmesh cur_mesh = bmesh.from_edit_mesh(bpy.context.active_object.data) cur_face = cur_mesh.faces[0] bmesh.ops.triangulate(cur_mesh, faces = [cur_face]) bmesh.update_edit_mesh(bpy.context.active_object.data, tessface=True, destructive=True) ```

Matthew Trescott commented

2017-06-08 17:15:58 +02:00

@mont29 Ah, thank you, and sorry for the inconvenience.

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bmesh.ops.triangulate causes crash #51730