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Maniphest T61264

obj.to_mesh() crashes on mesh with armature modifier, when run 2x
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Description

Hi
In the blend file below I have simple plane mesh, with armature modifier (armature is None). And simple blender operator script.
If I redo simple blender operator (by changing operator F6 property), blender will crash, on line:

obj.to_mesh(bpy.context.depsgraph, apply_modifiers, calc_undeformed=False)

If I remove the armature modifier, or set armature modifier object to skeleton, it works ok.

to_mesh_crash.blend115 KBDownload

Related Objects

Event Timeline

Jose Conseco (joseconseco) created this task.Feb 7 2019, 1:11 AM
Sebastian Parborg (zeddb) assigned this task to Sergey Sharybin (sergey).Feb 7 2019, 12:46 PM
Sebastian Parborg (zeddb) added a subscriber: Sebastian Parborg (zeddb).

I'm getting the following assert when changing the properties:
BLI_assert failed: blender/source/blender/depsgraph/intern/depsgraph_query.cc:145, DEG_get_evaluated_scene(), at 'scene_cow != __null && DEG::deg_copy_on_write_is_expanded(&scene_cow->id)'

Sebastian Parborg (zeddb) lowered the priority of this task from 90 to 50.Feb 7 2019, 12:46 PM
Brecht Van Lommel (brecht) edited projects, added BF Blender; removed BF Blender: 2.8.Mar 5 2019, 1:30 PM
Jose Conseco (joseconseco) added a comment.Mar 5 2019, 1:41 PM

I just noticed when I add 'USE_EVAL_DATA' to operator bl_options
bl_options = {"REGISTER", "UNDO","USE_EVAL_DATA"}
Then crash won't happen. I'm not sure if this bug should be marked as fixed then.

Jacques Lucke (JacquesLucke) added a subscriber: Jacques Lucke (JacquesLucke).Mar 14 2019, 3:48 PM

Still should not crash I guess..

Brecht Van Lommel (brecht) raised the priority of this task from 50 to High.Apr 1 2019, 1:44 PM
Jose Conseco (joseconseco) changed the task status from Unknown Status to Resolved.Apr 4 2019, 7:45 PM

I just tested today build 4th of april, and this file no longer crashes. It seems bug was fixed.

Philipp Oeser (lichtwerk) mentioned this in T63483: Reproducable crash in 2.80: bmesh.from_object / mesh_get_eval_final.Apr 11 2019, 2:54 PM
Peter Gervai (grin) added a subscriber: Peter Gervai (grin).EditedJan 4 2020, 1:55 PM

v2.80

I'm a (let's say "first time" though I have been playing with B since forever) enduser, first start of v2.xx and doing really simple edits (coloring the default cube on the default screen), and got bitten by this.

blender(BLI_system_backtrace+0x33) [0x559d50e2ff33]
blender(DEG_get_evaluated_scene+0x30) [0x559d50e39710]
blender(wm_event_do_handlers+0xd7) [0x559d5101b9b7]
blender(WM_main+0x20) [0x559d51011110]
blender(main+0x2ae) [0x559d50bb2fae]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb) [0x7f9db4fa7bbb]
blender(_start+0x2a) [0x559d50bea45a]
BLI_assert failed: /build/blender-1XEhGi/blender-2.80+dfsg/source/blender/depsgraph/intern/depsgraph_query.cc:159, DEG_get_evaluated_scene(), at 'scene_cow != __null && DEG::deg_copy_on_write_is_expanded(&scene_cow->id)'
Aborted

I really didn't do anything special, I was trying to add a simple spotlight, more specifically adjust its spot size using the slider. Bam, gone.

More details:
This is Debian v2.80.75, packaged.
It may be library incompatiblity, and since downloaded versions seem not to crash it may not be yours to fix. However it is possibly good to be aware of the problem, even I cannot point out the specific cause (unless I find a way to reliably crash it again).