Strange crash ERROR: FATAL: Index p_index = 3 is out of bounds (size() = 3). at: get (./core/templates/cowdata.h:155)

[fian46]

Godot version

v4.0.3.stable.official [5222a99]

System information

• OS win 10
• OS Android 12
• Renderer Mobile

Issue description

Game stop running and not show any error in debugger. but if running godot editor in console mode, the error shown as in this video and screenshoot

strange.crash.mp4

Steps to reproduce

not sure how it's not happen in consistent

Minimal reproduction project

N/A

[Chaosus]

Looks like #76900, just at another index.

[fian46]

maybe this is related too, sometimes this error shows in debugger like the screenshot above. i don't know when and how it happen. maybe it related to ./core/templates/* ?

[fian46]

hi guys i think we can close this. i found the culprit. the project was previously created with godot 4.0.1 stable. i use external animation to save with version 4.0.1. after i move global animation to build-in 4.0.3 through manage animation menu, the problem goes away.

[akien-mga]

We should still aim to fix this as a crash is an engine bug.

Do you still have access to the older files that could be used to trigger the crash?

[fian46]

No i don't have the files anymore

[akien-mga]

Closing then as this would be difficult to debug. If someone else is experiencing this bug in latest Godot releases, please open a new issue with a reproduction project.

[fian46]

@akien-mga is it possible for me to have godot in debug mode so i can where get the error exactly or at least can get the stacktrace ? I can't make small reproduce project for this issue and it only happens in this project .it is still crash btw. I don't think the animation files is the issue. After deploy it to android it's crash after 1 minutes.

[fian46]

i have seen the same issue with the cowdata at line 155 that produce the same crash with different index. this possibly related issue.

[akien-mga]

You could compile Godot from source with debug symbols (scons debug_symbols=yes), and run that binary through a debugger, with a breakpoint in the error print function, so you can get a stacktrace for what triggered the error.

If it actually crashes, then you would also get a stacktrace for the crash without having to set a breakpoint.

See https://docs.godotengine.org/en/stable/contributing/development/compiling/compiling_for_windows.html

[fian46]

i am not familiar with building the engine or familiar with C++. is there any debug build for the engine ?

[akien-mga]

@Calinou has debug builds of Godot 4.0.3 available here: https://github.com/Calinou/godot-debug-builds/releases/tag/v4.0.3

[fian46]

this is the result after crash with debug build in windows.
pointing at SelfList of GodotBody2D probably related to Godot 2D Physics maybe ?
probably not animation problem as i reported before

[fian46]

I have been checking the related issue with SelfList in Godot 2D Physics #50470 but this happening is Area2D too. Yes i am using Area2D but not using any multi thread operation or feature like #50470 also maybe 4.0.3 don't have multi threaded physics please correct me if i am wrong about this. Maybe this is related ? since output of crash is the same "p_elem->_root is true" happend couple time before the game is crashing.

[fian46]

@Calinou has debug builds of Godot 4.0.3 available here: https://github.com/Calinou/godot-debug-builds/releases/tag/v4.0.3

Disappear in 4.2 rc 1