That would be a pure hardware error. For example a cosmic ray hitting a cell the DRAM and flipping a bit. Or maybe the Intel FP-Bug, could also be a computer error.
Anything else in software is a programming error, but not necessarily a programmer error, since it might start with wrong HW specs, compiler bugs, etc.
Anything else in software is a programming error, but not necessarily a programmer error, since it might start with wrong HW specs, compiler bugs, etc.