There is disclosed a computer implemented method of detecting a fault in a system comprising the steps of executing at least three virtual machines, each virtual machine executing a same application software, in separated and isolated memory segments and in a dedicated core of a multi-core processor; said virtual machines being synchronized and concurrently executed by a common hypervisor; wherein non-faulty virtual machines provide an identical output message within a predefined time-interval; detecting a fault in an output of a virtual machine, said fault corresponding to a different output message of said faulty virtual machine. Developments include a distributed vote mechanism, pull/push mechanisms, association of output vote messages with a safety extension comprising identification information, virtual machine recovery using data context.
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