The ability to postmortem failures in deployed systems due to non-deterministic events is useful in crash investigations. With this goal in mind, we propose FlashBox - a system that acts as a black box for embedded systems, recording non-deterministic events (interrupts). The FlashBox hardware consists of a microcontroller and flash memory. The FlashBox software is an extension to a compiler, enabling recording capabilities at various granularities. There are no source code modifications required to use FlashBox and no assumptions made on processor capabilities such as hardware counters. The FlashBox log can be used for faithful replay with a goal to isolate faults and reason about failure.
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