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Despite many decades of research, the management of errors in a live operating system remains a challenging problem. This paper presents CuriOS, an operating system that incorporates several new error management techniques that significantly improve reliability. Errors detected by both hardware and software are signaled using language exception handling mechanisms. Unhandled exceptions do not crash the operating system and are dispatched to recovery routines. The architecture of CuriOS is influenced by microkernel design principles. Individual operating system services are assigned separate protection domains. This componentization provided by traditional microkernel designs helps confine errors. However, an error that occurs in a microkernel operating system service can potentially result in state corruption and service failure.
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