Hubris Bug Story 2024-03-24 introduces a bug found in the Hubris operating system, designed for deeply embedded systems. The bug stemmed from a combination of two innocent features that ultimately led to the network switch failing to power on. The culprit? An issue with memory access permissions when loaning memory across tasks in Hubris IPC. An analysis of the bug revealed how a seemingly unrelated code change caused a memory violation, highlighting the complex nature of Hubris kernel development. Matt Keeter’s smart system optimization improved RAM usage by 30%, showing the innovative solutions and challenges faced in developing a reliable and efficient operating system for embedded systems.
https://cliffle.com/blog/who-killed-the-network-switch/