Debug Assert in wm_messagebus: Occurs when manipulating collection visibility and (un)linking from a python script #60267

New Issue

Jesse Yurkovich · 2019-01-07T12:22:13+01:00

Jesse Yurkovich commented

2019-01-07 12:22:13 +01:00

System Information
Operating system: Win10
Graphics card: nVidia Quadro 600

Blender Version
Broken: 2.80 (sub 40), branch: master, commit date: 2019-01-07 04:34, hash: 6015a03255
Worked: Most likely a build in the Dec. time frame

Short description of error
The following assert is triggered when attempting to set the visibility of a collection and then deleting it:

BLI_assert failed: c:\users\_removed_\source\repos\blender-git\blender\source\blender\windowmanager\message_bus\intern\wm_message_bus.c:147, WM_msgbus_handle(), at 'mbus->messages_tag_count == 0'

Exact steps for others to reproduce the error
msgbus-assert-2.blend

Load attached .blend file
Run the script that is currently loaded in the text editor
Execute bpy.ops.test.trigger_assert() to run that code and trigger the assert

Removing the following line from the script will prevent the assert from triggering: col_bool.hide_viewport = False

This is a reduced repro -- disregard the fact I'm attempting to remove a collection that still has objects inside etc. as the assert happens even if I delete the object.

**System Information** Operating system: Win10 Graphics card: nVidia Quadro 600 **Blender Version** Broken: 2.80 (sub 40), branch: master, commit date: 2019-01-07 04:34, hash: 6015a03255af Worked: Most likely a build in the Dec. time frame **Short description of error** The following assert is triggered when attempting to set the visibility of a collection and then deleting it: ```BLI_assert failed: c:\users\_removed_\source\repos\blender-git\blender\source\blender\windowmanager\message_bus\intern\wm_message_bus.c:147, WM_msgbus_handle(), at 'mbus->messages_tag_count == 0'``` **Exact steps for others to reproduce the error** [msgbus-assert-2.blend](https://archive.blender.org/developer/F6209012/msgbus-assert-2.blend) - Load attached .blend file - Run the script that is currently loaded in the text editor - Execute `bpy.ops.test.trigger_assert()` to run that code and trigger the assert Removing the following line from the script will prevent the assert from triggering: `col_bool.hide_viewport = False` This is a reduced repro -- disregard the fact I'm attempting to remove a collection that still has objects inside etc. as the assert happens even if I delete the object.

Jesse Yurkovich commented

2019-01-07 12:22:13 +01:00

Added subscriber: @deadpin

Dalai Felinto commented

2019-01-07 14:54:43 +01:00

Added subscribers: @ideasman42, @dfelinto

Dalai Felinto self-assigned this 2019-01-07 14:54:43 +01:00

Dalai Felinto commented

2019-01-07 14:54:43 +01:00

For the records, the Python script is:

parent_col = context.scene.collection
col_bool = bpy.data.collections["DC_boolean_Cube"]
col_bool.hide_viewport = False
parent_col.children.unlink(col_bool)
bpy.data.collections.remove(col_bool)

There is a chance the issue is related to #57857 and how we remove hidden collections from the depsgraph.
That said @ideasman42 may want to investigate this a bit since it is message bus related.

(Note I didn't try to confirm the bug, but I try tomorrow with a debug build).

For the records, the Python script is: ``` parent_col = context.scene.collection col_bool = bpy.data.collections["DC_boolean_Cube"] col_bool.hide_viewport = False parent_col.children.unlink(col_bool) bpy.data.collections.remove(col_bool) ``` There is a chance the issue is related to #57857 and how we remove hidden collections from the depsgraph. That said @ideasman42 may want to investigate this a bit since it is message bus related. (Note I didn't try to confirm the bug, but I try tomorrow with a debug build).

blender-admin commented

2019-01-14 03:58:38 +01:00

This issue was referenced by 723e469686

This issue was referenced by 723e4696860a05018e532b0695177d68a1b5f75e

Campbell Barton commented

2019-01-14 03:59:49 +01:00

Changed status from 'Open' to: 'Resolved'

Campbell Barton closed this issue

2019-01-14 03:59:49 +01:00

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Debug Assert in wm_messagebus: Occurs when manipulating collection visibility and (un)linking from a python script #60267