Isaac Sim 5.1 freezes while editing action graph

[GoldenZephyr]

Description

I have found Isaac Sim to be quite unstable when trying to do anything with the action graph, to the point of being basically unusable. I think this is basically the same issue reported in #329 .

It seems that doing anything with the action graph (e.g., adding new edges, deleting edges, changing attributes within each of the blocks) for more than a couple of minutes will lead to Isaacsim freezing and becoming unresponsive (sigint / ctrl-c won't kill it, but sigquit / ctrl-\ will).

But I do have a reasonably straightfoward way of triggering the issue:

• Load an Isaacsim environment that has an action graph (e.g., https://drive.google.com/file/d/1pr8ytUHcqgoH8oT48YIm2RQ1UMnP12_l/view?usp=sharing , which is the Isaacsim example Office environment, and a Turtlebot with an action graph as explained in the Isaacsim ROS2 tutorial).
• Start the simulation (play button)
• Stop the simulation (stop button)
• In the action graph, right click an edge and select "disconnect".
• Isaacsim will become unresponsive.

This has been the most reliable way for me to trigger this issue, but I don't think it's specific to disconnecting edges and seems to share similarities with the symptoms in #329.

Isaac Sim version

5.1.0

Operating System (OS)

Ubuntu 24.04

GPU Name

RTX 4090

GPU Driver and CUDA versions

580.95.05, CUDA 13.0

Logs

kit_20260215_184020.log
(There doesn't seem to be any useful information in this log, compared to an instance where Isaacsim doesn't crash)

Additional information

Screen recording of triggering the bug https://drive.google.com/file/d/1b24zSd_hsj5xhSjVQPxJzVTkaXN-uTtT/view?usp=sharing

[Laurens26]

Same behaviour on my side:
I'm having stability issues with Isaac Sim 5.1 on Ubuntu 24.04 via WebRTC Streaming Client when editing OmniGraphNodes.
When I edit OmniGraphNodes in the ActionGraph View e.g. disconnect Node connections or deleting Nodes, Isaac Sim gets stuck very often and it's WebRTC stream is not available anymore.
Workaround so far was to kill and restart the Isaac Sim. But as this happens very often when editing OmniGraphNodes it's quite annoying to work on OmniGraphs.

I'm not sure if the issue is Isaac Sim related or the Action Graph Extension