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How a Blacklisted Kernel Module Fixed a Crash-Looping Kubernetes Pod on NVIDIA Jetson

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An engineer debugging a k3s deployment on an NVIDIA Jetson edge device discovered that svclb-traefik was stuck in a CrashLoopBackOff despite correct pod scheduling and manifests. The root cause was not visible through standard Kubernetes tooling but lay three layers deeper, inside the Linux kernel's packet-classification engine. The issue traced back to a conflict involving nf_tables, the kernel module powering nftables — Linux's modern replacement for the legacy iptables framework. Blacklisting the nf_tables module resolved the crash, prompting a detailed investigation into how netfilter hooks, iptables, nftables, and eBPF relate to one another. The incident highlighted how vendor kernels can break higher-level abstractions, forcing engineers to understand the underlying Linux networking stack they rarely need to examine directly.

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How a Blacklisted Kernel Module Fixed a Crash-Looping Kubernetes Pod on NVIDIA Jetson · ShortSingh