Isn't the solution to simply duplicate the code and compare it before execution? Do it 3 times and use the majority
Yes, voting is a common way to deal with radiation or critical software. There are of course also complications about the voting software itself needing to also be redundant. Some can be done with hardware, or you can just radiation harden parts of the system (reducing overall cost).
This is definitely one of those problems where at a quick glance it seems like there's a few simple solutions that can resolve 90% of issues but when you dig into the weeds you find out that 20% dictates most of the outcomes and there's at most a 10% overlap with your quick/obvious solutions.
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Yes, voting is a common way to deal with radiation or critical software. There are of course also complications about the voting software itself needing to also be redundant. Some can be done with hardware, or you can just radiation harden parts of the system (reducing overall cost).
This is definitely one of those problems where at a quick glance it seems like there's a few simple solutions that can resolve 90% of issues but when you dig into the weeds you find out that 20% dictates most of the outcomes and there's at most a 10% overlap with your quick/obvious solutions.