Crash when setting AnimationTree active with circular dependency (infinite loop)

[Kantrull]

Godot version

v4.1.rc2.official [4642448]

System information

Godot v4.1.rc2 - Windows 10.0.22621 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3060 (NVIDIA; 31.0.15.3623) - AMD Ryzen 7 5700G with Radeon Graphics (16 Threads)

Issue description

When setting the AnimationTree to active, Godot crashes.

Steps to reproduce

Crash.mp4

Minimal reproduction project

Crash.zip

[Kantrull]

Im closing the issue, problem was that all the transitions were set to auto and it was in an infinite loop.

[akien-mga]

We should keep it open as it's still a bug which should aim to prevent, by detecting this kind of circular dependency and break out of it.

[Flynsarmy]

It's extremely easy to fall into this issue as auto progression is the default behaviour. So if the user makes all the connections with the intention of then configuring them, it's already too late.

Another very simple reproduction of the problem in the issue linked above. I've closed it as a duplicate.

[TokageItLab]

I remember adding a check to break out of this kind of infinite loop, but some check case may be not working.