crashl

CrashL is an open‑source crash logging framework designed for embedded devices and low‑resource environments. It collects stack traces, system state snapshots, and diagnostic information automatically when a program encounters a fatal error, and stores the data in a compact format that can be transmitted over constrained networks or saved on flash memory for later analysis. CrashL was first released in 2018 by the Embedded Systems Research Group at University of Techville under a permissive MIT license and has since been adopted by several commercial IoT vendors.

The framework is written in ANSI C and provides a small runtime library that can be integrated into applications with minimal code changes. It supports multiple operating systems, including FreeRTOS, Zephyr, and bare‑metal ARM Cortex‑M cores, and offers an API for manual crash reporting. CrashL employs a checksum‑based hashing scheme to detect and prevent tampering of log files, and includes a set of pre‑defined macros that automatically capture the context of unhandled exceptions such as null pointer dereferences, buffer overflows, or division by zero.

CrashL’s extensive documentation lists several use cases: debugging firmware updates for home automation hubs, post‑mortem analysis of autonomous vehicle failures, and forensic logging in industrial control systems. Its lightweight design allows it to operate with less than 1 kB of RAM overhead, making it suitable for legacy devices that cannot accommodate larger logging solutions. The project’s active community maintains a yearly release cycle, currently on version 2.1, with improved support for CAN bus diagnostics and a new web‑based GUI for viewing aggregated crash reports.