JD Cloud Developers

Nov 24, 2022 · Fundamentals

How a Curl‑NSS dentry Leak Caused Our Load Balancer’s Memory Spike

Our operations team faced alarming memory usage over 90% on several load‑balancer nodes, traced the surge to a dentry leak in curl‑7.19.7’s NSS library, and resolved it by disabling the probing script, clearing caches, and setting the NSS_SDB_USE_CACHE environment variable, while also reviewing Linux memory management concepts such as paging, NUMA, and slab allocation.