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There's actually an open bug in k8s right now where if you deploy a pod with a node selector, but that node is full, new pods will be spawned every second forever until the cluster falls over.
What we saw was stalling in the kernel run queue. One of the other people on our team did some debugging with eBPF. I think they may have used runqlen.py. But as soon as they evicted the one damaging pod from the machine, all the other workloads were no longer starved.
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