dbaplus Community

Feb 4, 2025 · Fundamentals

Why Does My Upgraded Chumby 8 Show 100% CPU Usage? Uncovering a Hidden Kernel Timer Bug

After upgrading a PXA166‑based Chumby 8 from Linux 2.6.28 to 6.x, the top command constantly reported 100% CPU usage, leading the author through profiling, kernel source analysis, procfs inspection, and a timer‑register sequencing bug that was finally fixed by adjusting the delay in the timer_read function.