building an OS (all streams)

Currently Playing: building my own OS in c++ (week 116, kernel thread boot loop)

#livecoding #operatingsystem #coding welcome: https://offlinemark.com/welcome discord: https://discord.gg/P6zQBsD2ng Welcome! I’m an aspiring systems programmer. Professionally, I used to work in infosec, but now I work on music production software & hardware. I stream OS/kernel development every week for 2 hours. (I’ve done this for over 75 weeks in a row! Sundays 10a-12 ET) From February 2024 to May 2025, I streamed myself doing all the labs for MIT’s old Operating Systems Engineering course (6.828 (2018)). Through doing this, I became very familiar with JOS, which is the x86 OS used for the course. I had almost no experience with OS development when I started, although I did have much experience with programming and low level concepts. I did the coursework because I wanted to write my own OS, but felt I wasn’t ready. Now, from May 2025 to present, I’m pursuing my own learning agenda with OS development, and starting my on own OS. If this resonates with you, please subscribe and I'll see you in a stream :) 00:00:00 Start 00:14:28 Warm-up exercise: fixing idle task pointer assertion issue 00:36:46 Introducing the main mystery: debugging 4000 tasks boot loop crash 00:51:00 Binary search debugging to isolate the task count causing crashes 01:02:03 Stack trace analysis reveals page fault in ETL pool allocate function 01:20:09 Deep investigation into ETL pool internals and free list mechanism 01:48:48 AI consultation to understand ETL pool's metadata storage behavior 01:54:25 Discovery that ETL stores pointers at the start of free objects 02:06:01 Exploring potential solutions to guard page and pool compatibility 02:25:34 Final discussion on static vs dynamic allocation approaches