Go Scheduler
Go Scheduler Contents Introduction Compilation and Go Runtime Primitive Scheduler Scheduler Enhancement GMP Model Program Bootstrap Creating a Goroutine Schedule Loop Finding a Runnable Goroutine Goroutine Preemption Handling System Calls Network I/O and File I/O How netpoll Works Garbage Collector Common Functions Go Runtime APIs Disclaimer This blog post primarily focuses on Go 1.24 programming
xz-backdoor.md FAQ on the xz-utils backdoor (CVE-2024-3094) This is a living document. Everything in this document is made in good faith of being accurate, but like I just said; we don't yet know everything about what's going on. Update: I've disabled comments as of 2025-01-26 to avoid everyone having notifications for something a year on if someone wants to suggest a correction. Folks are free to
The Untold Story of SQLite
TranscriptNote: This podcast is designed to be heard. If you are able, we strongly encourage you to listen to the audio, which includes emphasis that's not on the page IntroductionAdam: Hello and welcome to CoRecursive. I’m Adam Gordon Bell. Each episode of CoRecursive, someone shares the fascinating story behind some piece of software being built. On April 1st, 2014, an open source maintainer got
Peter Jay Salzman, Michael Burian, Ori Pomerantz, Bob Mottram, Jim Huang 1 Introduction 1.1 Authorship 1.2 Acknowledgements 1.3 What Is A Kernel Module? 1.4 Kernel module package 1.5 What Modules are in my Kernel? 1.6 Is there a need to download and compile the kernel? 1.7 Before We Begin 2 Headers 3 Examples 4 Hello World 4.1 The Simplest Module 4.2 Hello and Goodbye 4.3 The __init and __exit Mac
This is a companion article to a talk about Docker+WebAssembly that we gave at "Docker Community All Hands 7, Winter Edition" on Dec 15th, 2022. Introduction Recently Docker announced support for WebAssembly in cooperation with WasmEdge. This article will explain what is WebAssembly, why it is relevant to the Docker ecosystem and provide some hands-on examples to try on. We assume you are familiar
Raspberry Pi 3 Fastboot - Less Than 2 Seconds - Bir Coder'ın Günlüğü
Bu yazıyı Türkçe oku.|Read the post in Turkish. This post tells about my journey of fast-booting a Raspberry Pi 3 (RPI). In addition to that, some optimizations are discussed that can be applied to a Qt (QML) application. In the end, we will have a RPI that boots from power-up to Linux shell in 1.75 seconds, power-up to Qt (QML) application in 2.82 seconds. Edit : There are requests for a demo ima
Win32 is the stable Linux userland ABI (and the consequences) - the sporks space
This post was inspired by some controversy with Valve and their support for Linux, but the bulk of it comes from long-term observation. One of the biggest impacts with the viability of Linux on the desktop was Valve’s Proton, a Wine fork integrated in Steam allowing almost any Windows game to work out of the box. To Linux users, life was good. However, with the recent announcement of the Steam Dec
December 15, 2023 This article was contributed by Ronja Koistinen The gccrs project is an ambitious effort started in 2014 to implement a Rust compiler within The GNU Compiler Collection (GCC). Even though the task is far from complete, progress has been made since LWN's previous coverage, according to reports from the project. Meanwhile, another hybrid and more mature approach to GCC Rust code ge
A Git story: Not so fun this time | Brachiosoft Blog
Linus Torvalds once wrote in a book that he created Linux just for fun, but it ended up sparking a revolution. Git, his second major creation, was also an accidental revolution. It’s now a standard tool for software engineers, but its origin story wasn’t so much fun this time, at least for Linus. Linus doesn’t scale 1998 was a big year for Linux. Major companies like Sun, IBM, and Oracle started g
Disclaimer: I work at Uber and am partially responsible for bringing zig cc to serious internal use. Opinions are mine, this blog post is not affiliated with Uber. I talked at the Zig Milan meetup about “Onboarding Zig at Uber”. This post is a little about “how Uber uses Zig”, and more about “my experience of bringing Zig to Uber”, from both technical and social aspects. The video is here. The res
Linux/4004 Slowly booting full Linux on the intel 4004 for fun, art, and absolutely no profit TL;DR I booted Debian Linux on a 4-bit intel microprocessor from 1971 - the first microprocessor in the world - the 4004. It is not fast, but it is a real Linux kernel with a Debian rootfs on a real board whose only CPU is a real intel 4004 from the 1970s. The video is sped up at variable rates to demonst
Try Mastering Emacs for free! Are you struggling with the basics? Have you mastered movement and editing yet? When you have read Mastering Emacs you will understand Emacs. It’s that time again: there’s a new major version of Emacs and, with it, a treasure trove of new features and changes. Notable features include the formal inclusion of native compilation, a technique that will greatly speed up y
BPF CO-RE reference guide
The missing manual BPF CO-RE (Compile Once – Run Everywhere) is a modern approach to writing portable BPF applications that can run on multiple kernel versions and configurations without modifications and runtime source code compilation on the target machine. This is in direct opposition to the more traditional approach provided by BCC framework in which BPF application source code compilation is
The Pitchfork Story
A bit more than two years ago, as part of my work in Shopify’s Ruby and Rails Infrastructure team, I released a new Ruby HTTP server called Pitchfork. It has a bit of an unusual design and makes hard tradeoffs, so I’d like to explain the thought process behind these decisions and how I see the future of that project. Unicorn’s Design Is Fine Ever since I joined Shopify over 11 years ago, the main
Flipping Pages: An analysis of a new Linux vulnerability in nf_tables and hardened exploitation techniques
This blogpost is the next instalment of my series of hands-on no-boilerplate vulnerability research blogposts, intended for time-travellers in the future who want to do Linux kernel vulnerability research. Specifically, I hope beginners will learn from my VR workflow and the seasoned researchers will learn from my techniques. In this blogpost, I'm discussing a bug I found in nf_tables in the Linux
Well-maintained free-software projects usually make a point of quickly fixing known security problems, and the Samba project, which provides interoperability between Windows and Unix systems, is no exception. So it is natural to wonder why the fix for CVE-2021-20316, a symbolic-link vulnerability, was well over two years in coming. Sometimes, a security bug can be fixed with a simple tweak to the
The More You Know, The More You Know You Don’t Know
The More You Know, The More You Know You Don’t Know A Year in Review of 0-days Used In-the-Wild in 2021 Posted by Maddie Stone, Google Project Zero This is our third annual year in review of 0-days exploited in-the-wild [2020, 2019]. Each year we’ve looked back at all of the detected and disclosed in-the-wild 0-days as a group and synthesized what we think the trends and takeaways are. The goal of
The Evolving eBPF Toolchain
These days there is an ever-growing list of tools and frameworks for working with eBPF, all at varying levels of abstraction. There does seem to be a few that sit at the core of the rest of the eBPF ecosystem. However, the ecosystem is changing rapidly, and I’ve found it to be a bit difficult to navigate through the sea of information that’s out there and understand which tools are the current “st
This is the first part of my series; the other parts are Java 25’s new CPU-Time Profiler: The Implementation (2) Java 25’s new CPU-Time Profiler: Queue Sizing (3) Java 25’s new CPU-Time Profiler: Removing Redundant Synchronization (4) Back to the blog post: More than three years in the making, with a concerted effort starting last year, my CPU-time profiler landed in Java with OpenJDK 25. It’s an
The next release of systemd has been percolating for an unusually long time. Systemd releases are usually about six months apart, but v257 came out in December 2024, and v258 just now seems to be nearing the finish line; the third release candidate for v258 was published on August 20 (release notes). Now is a good time to dig in and take a look at some of the new features, enhancements, and remova
As part of my PhD studies, I’m working on a distributed task runtime called HyperQueue. Its goal is to provide an ergonomic and efficient way to execute task graphs on High-Performance Computing (HPC) distributed clusters, and one of its duties is to be able to spawn a large amount of Linux processes efficiently. HyperQueue is of course written in Rust1, and it uses the standard library’s Command
The Atrocious State Of Binary Compatibility on Linux and How To Address It. By Dale Weiler GitHub Time To Read: ~30 Minutes Last Updated: Monday, March 17th 2025 Summary Linux binary compatibility is plagued by one thing that is often overlooked when evaluating shipping software on Linux. This article will deconstruct how to arrive to that conclusion, how to address it when shipping software today
Are you tired of not getting security updates? Is your old MacBook getting sluggish and you want to provide a new life to it? Look no further: Liberate it with Linux! Before we proceed, use this guide is only if you already have an old MacBook lying around or if you found one extremely cheap, as computers like Lenovo or Framework would have better Linux support. Despite being old, and a bit abused
research!rsc: Hash-Based Bisect Debugging in Compilers and Runtimes
Setting the Stage Does this sound familar? You make a change to a library to optimize its performance or clean up technical debt or fix a bug, only to get a bug report: some very large, incomprehensibly opaque test is now failing. Or you add a new compiler optimization with a similar result. Now you have a major debugging job in an unfamiliar code base. What if I told you that a magic wand exists
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xz-utils backdoor situation (CVE-2024-3094)
The Linux Kernel Module Programming Guide
WebAssembly: Docker without containers!
Progress toward a GCC-based Rust compiler
How Uber Uses Zig - Motiejus Jakštys Public Record
Linux/4004 - Dmitry.GR
What's New in Emacs 28.1?
The long road to a fix for CVE-2021-20316
Java 25's new CPU-Time Profiler (1) - Mostly nerdless
Highlights from systemd v258: part one
Process spawning performance in Rust
JangaFX - Insight: Linux Binary Compatibility
Liberating the MacBook Air 2013