SSebinraj3h ago · 17 min readThe Work That Never Ran: How a Kernel Workqueue Bug Froze a GPU, and the Test That Catches ItHow one missing list insertion left GPU fences unsignaled forever, and how a stress test turns a hard-reboot hang into a clean failure The scariest bugs are not the ones that crash. They are the onessebinrajs.hashnode.dev
SSebinraj4d ago · 15 min readWhy My GPU Lost Half Its Speed: Chasing a 48% Benchmark Drop Down to Memory FragmentationHow a starved GPU settled for 4 KB pages, and how its driver learned to wait for 2 MB ones A 4K graphics benchmark that should score 4,667 came back with 2,445. Nearly half the performance was gone. sebinrajs.hashnode.dev
SSebinraj4d ago · 8 min readA 32-bit Truncation, Three Fences and a GPU Test: Catching an Explicit-Fencing Bug in the Display DriverHow a long stored in an int made the display skip a fence wait, and how the GPU test I wrote keeps it from coming back Some kernel bugs hide for a long time because the code path that triggers themsebinrajs.hashnode.dev
RRavidu Priyankara6d ago · 46 min readOneLane: Reverse-Engineering Lost Updates in eBPF Per-CPU Counters Under Interrupt Pressure1.The First Thread Pulled If you've read my previous write-up and looked at its code, you might have noticed a small comment block inside update_error_stats(). static __always_inline void update_error1ravindu-priyankara.hashnode.dev
LLineesh KumarNov 1 · 6 min read7 Open-Source Operating Systems That Are Not Based on Linux and Are Worth TryingDiscover 7 open-source operating systems beyond Linux. Explore unique features, performance, desktop experiences, and alternatives worth trying. if there are, and they have nothing to do with Windows technoluting.hashnode.dev
Jjason duhamellOct 24 · 11 min readBringing OpenWrt to the ASUS ExpertWiFi EBG15A BCM4906 porting diary: firmware handoff, MDIO selection, DSA headroom, LEDs, and testing a dual-bank upgrade. My ASUS ExpertWiFi EBG15 is now running a development build of OpenWrt. Getting there inps2chiper.hashnode.dev
RRavidu PriyankaraOct 13 · 44 min readReverse-Engineering Linux Kernel Crypto: From HMAC Key Preparation to AES Key Memory1. Introduction 1.1 Why Crypto Internals? Last two month, I spent a significant amount of time investigating copy-fail vulnerability. During that process, I started looking deeper into Linux kernel me1ravindu-priyankara.hashnode.dev
PPaul AdeoyeOct 1 · 9 min readProcesses, System Calls and the Linux Kernel: In the previous article, we established the relationship between the CPU, RAM, storage, and the operating system. With that foundation in place, the next question is: What actually happens inside the paulking.hashnode.dev
HHritik ranjanSep 20 · 45 min read🐧 Linux for DevOps: Complete Beginner to Advanced Guide with Commands, Networking, Users, Permissions, AWK, SED, LVM & MoreIf you are starting your DevOps journey, you will quickly realize that many tools and platforms run on Linux. For example: AWS EC2 Docker Kubernetes Jenkins Nginx Apache Terraform Ansible Prometheus G2blogs.hritikranjan.in
SShevchenko IvanSep 9 · 7 min readEdimax OAP1300 Recovery over UART + TFTPA colleague handed me a dead Edimax OAP1300 access point. It powered on, the serial console showed U-Boot, and then… nothing. It sat in the TFTP recovery loop forever. This is how I brought it back byhelp.dc24.cloud
