Mozilla discovered that Firefox crashes on Linux, especially older Debian‑based distributions, whenever users perform an image search on Google; the issue stems from a recent AI‑generated JavaScript function allocating excessive variables, exposing a Linux kernel stack‑limit bug that was fixed in kernel 4.20.
A detailed investigation reveals that a futex bug in Linux kernel 2.6.32-504 causes Java programs on Hadoop and xtrabackup processes to hang, and the issue can be resolved by upgrading to a newer kernel version.
During a Redis container migration, slowlog entries suddenly reported 1800 ms latency despite low QPS, leading to a deep investigation that traced the anomaly to a kernel bug affecting the Time Stamp Counter on Skylake‑X CPUs and improper use of gettimeofday for timing.
This article details a real‑world investigation of unexpected Redis slowlog latencies after container migration, tracing the issue through slowlog mechanics, contradictory monitoring data, gettimeofday inaccuracies, NTP drift, and ultimately a kernel bug affecting Skylake‑X CPUs, and offers concrete recommendations for reliable time measurement.
The article investigates intermittent CPU usage spikes on Linux servers caused by a kernel cputime bug, explains the root‑cause analysis, describes a cold patch applied to newer kernels, and details a hot‑patch solution that safely resolves the issue across thousands of production machines.
