i can't even find anything online

[spring osprey]

I can find a few things but it could have many causes: https://www.google.com/search?q=rcu%3A stack dump where rcu gp kthread last ran

[fresh notch]

going to try another usb stick. no idea if that could be related to the issue, but i'm almost out of ideas for the night

interesting, new usb stick fixed it apparently