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WP4 Algorithms, Tools, and Fault Injection

WP4 Algorithms, Tools, and Fault Injection. Fault Injection Jonny Vinter, SP. Fault Injection. Fault injection is a way to experimentally validate dependability of computer systems Accelerates occurrences of faults in the system Main purpose is to evaluate and debug error handling mechanisms

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WP4 Algorithms, Tools, and Fault Injection

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  1. WP4Algorithms, Tools, and Fault Injection Fault Injection Jonny Vinter, SP

  2. Fault Injection • Fault injection is a way to experimentally validate dependability of computer systems • Accelerates occurrences of faults in the system • Main purpose is to evaluate and debug error handling mechanisms • Used at various abstraction levels and phases of the development process • Fault injection is mandatory in safety standard IEC 61508 when required diagnosis coverage is at least 90% • IEC 61508 adapted by the automotive industry as ISO WD 26262

  3. Mutation testing vs. FI (some differences) Mutation testing (SW) • Aim: Fault removal (test case assessment) • Pre-runtime • Remove faults during development Fault injection (HW, SW, Sys.) • Aim: Fault tolerance • Run-time • Handle residual faults and physical faults during operation

  4. Common FI Classification in the Literature • Fault injection is traditionally used for emulating hardware faults • Techniques are normally divided into: • Simulation-based fault injection (SBFI) where faults are injected into hardware models (e.g. VHDL models) • Physical fault injection (PhFI) where faults are injected into an actual physical system or prototype • Examples Heavy-ion, Pin-level, SCIFI, SWIFI, …

  5. FI Classification in MOGENTES • To avoid focusing only on the target for fault injection, the classification presented in the MOGENTES survey is instead based on how fault injection mechanisms are implemented. • Techniques are thus in MOGENTES divided into: • Hardware-implemented fault injection (HIFI) • Software-implemented fault injection (SWIFI) • Model-implemented fault injection (MIFI)

  6. Fault Injection in MOGENTES

  7. FI Tools Using Formal/Experimental Methods

  8. MODIFI –Overview • Fault injection in Matlab/Simulink blocks and signals • Several HW fault models supported • Several fault timing properties supported • Easy-to-use GUI • Using Matlab language

  9. Hardware-Implemented FI Platform • Prototype board from HighTec(http://www.hightec-rt.com) • Infineon TriCore 1796 microcontroller • Debugging either via: • Lauterbach debugger (DECOS) • Tool chain “free” for non-commercial research • Development platform • GNU C/C++ compiler • IDE (target connection, debug) • Real-time OS (PXROS)

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