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This is a warning about memory (de)allocation /C++ object deletion at runtime and should not have anything to do with your ROS installation details.
This is not the only common ROS 2 package where I see this warning on exit. I think there are known issues with class_loader like this, and I've seen this warning in other base installation and common packages.
Here's a PR talking about some memory issues with class_loader:
https://github.com/ros/class_loader/pull/199
I'd love to know more about the exact problem as well because I have some instances in my ROS 2 installations where I see this all the time. For personal and prototype work I have been ignoring it with no obvious ill effects.
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