Regression: Crash if you use the measure tool while changing certain user preferences in a 'depsgraph_update_post' handler #118223

New Issue

Ric-Lopez · 2024-02-13T23:17:02+01:00

Ric-Lopez commented

2024-02-13 23:17:02 +01:00

Blender Version
Broken: version: 4.1.0 Alpha, branch: main, commit date: 2024-01-18 00:01, hash: d068407a004c
Worked: version: 4.1.0 Alpha, branch: main, commit date: 2024-01-11 21:04, hash: 16741e735b1b

Short description of error
If you have a handler of type depsgraph_update_post and this handler changes certain user preferences, Blender will crash when using the measure tool.

Example code to add the problematic handler:

import bpy
from bpy.app.handlers import persistent

@persistent
def my_handler(scene):
## The crash can happen if you add a measure while any of these values are edited:
# - bpy.context.preferences.view.show_navigate_ui
# - bpy.context.preferences.view.mini_axis_type
# - bpy.context.preferences.view.mini_axis_size
# - bpy.context.preferences.view.gizmo_size_navigate_v3d

## Or it can also happen if you change any theme preference:
    bpy.context.preferences.themes[0].view_3d.space.gradients.high_gradient = (0.50, 0.20, 0.20)

bpy.app.handlers.depsgraph_update_post.append(my_handler)

bpy.context.scene.update_tag() # Calls the handler

Exact steps for others to reproduce the error

Open attached .blend file
Run the script in the Text Editor
Select the measure tool,
Click on any part of the screen

Before I can even drag the tool, Blender Crashes.

**Blender Version** Broken: version: 4.1.0 Alpha, branch: main, commit date: 2024-01-18 00:01, hash: `d068407a004c` Worked: version: 4.1.0 Alpha, branch: main, commit date: 2024-01-11 21:04, hash: `16741e735b1b` **Short description of error** If you have a handler of type `depsgraph_update_post` and this handler changes certain user preferences, Blender will crash when using the measure tool. Example code to add the problematic handler: ```python import bpy from bpy.app.handlers import persistent @persistent def my_handler(scene): ## The crash can happen if you add a measure while any of these values are edited: # - bpy.context.preferences.view.show_navigate_ui # - bpy.context.preferences.view.mini_axis_type # - bpy.context.preferences.view.mini_axis_size # - bpy.context.preferences.view.gizmo_size_navigate_v3d ## Or it can also happen if you change any theme preference: bpy.context.preferences.themes[0].view_3d.space.gradients.high_gradient = (0.50, 0.20, 0.20) bpy.app.handlers.depsgraph_update_post.append(my_handler) bpy.context.scene.update_tag() # Calls the handler ``` **Exact steps for others to reproduce the error** - Open attached .blend file - Run the script in the Text Editor - Select the measure tool, - Click on any part of the screen Before I can even drag the tool, Blender Crashes.

preference_changing_in_handlers__crash.blend

913 KiB

Ric-Lopez added the

labels 2024-02-13 23:17:03 +01:00

Germano Cavalcante commented

2024-02-14 01:53:21 +01:00

Hi @Ric-Lopez,

Thank you for reporting this issue.

To investigate the crash with the measure tool in Blender 4.10 Beta, could you to provide us with crash logs? These logs can help us identify the cause of the crash and find a solution.

See: https://docs.blender.org/manual/en/dev/troubleshooting/crash.html#macos

Additionally, if you have any other information or error messages related to the crash, please let us know.

Hi @Ric-Lopez, Thank you for reporting this issue. To investigate the crash with the measure tool in Blender 4.10 Beta, could you to provide us with crash logs? These logs can help us identify the cause of the crash and find a solution. See: https://docs.blender.org/manual/en/dev/troubleshooting/crash.html#macos Additionally, if you have any other information or error messages related to the crash, please let us know.

Germano Cavalcante added

Status

Needs Information from User

and removed

Status

Needs Triage

labels 2024-02-14 01:53:30 +01:00

Ric-Lopez commented

2024-02-14 03:34:40 +01:00

Attached is the crash log - no additional messages came on screen

Blender-2024-02-13-213306.ips

102 KiB

Germano Cavalcante commented

2024-02-14 14:53:03 +01:00

Thank you for providing the crash log, @Ric-Lopez.
I analyzed the IPS file, but I didn't identify anything obvious that could indicate why it's crashing :\

Maybe the developers can figure it out (@Michael-Parkin-White-Apple ?).

Looking at the history of changes in the measure tool file, I also didn't find anything that could justify the regression.
https://projects.blender.org/blender/blender/commits/branch/main/source/blender/editors/space_view3d/view3d_gizmo_ruler.cc

I will forward it to our developers for further investigation. In the meantime, is there anything else you'd like to add or any other steps you think might have triggered the crash?
Also, if you have some time, could you test some archived development builds to try and find out which build the problem was introduced in?
https://builder.blender.org/download/daily/archive/

Thank you for providing the crash log, @Ric-Lopez. I analyzed the IPS file, but I didn't identify anything obvious that could indicate why it's crashing :\\ Maybe the developers can figure it out (@Michael-Parkin-White-Apple ?). Looking at the history of changes in the measure tool file, I also didn't find anything that could justify the regression. https://projects.blender.org/blender/blender/commits/branch/main/source/blender/editors/space_view3d/view3d_gizmo_ruler.cc I will forward it to our developers for further investigation. In the meantime, is there anything else you'd like to add or any other steps you think might have triggered the crash? Also, if you have some time, could you test some archived development builds to try and find out which build the problem was introduced in? https://builder.blender.org/download/daily/archive/

Germano Cavalcante added

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Regression: Crash if you use the measure tool while changing certain user preferences in a 'depsgraph_update_post' handler #118223