Ok, my fault. The "argument" still holds, though, as hardware memory corruption mustn't necessarily result in only single bits flipping — it just happened to begin that way in the limited number of cases I've observed so far. I.e., the memtest statistics (after running for a couple of days) showed a clear pattern of certain "bit lines" flipping far more frequently than others.
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Flipping of more than one bit is possible and probably quite common, but to have bits flip so that always a substraction of 1 comes out is just very unlikely. I did check the other two examples and while one was similar to the case I posted about, the other one was just a flip of the lowest bit.
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Not necessarily. The corruption could be in the address used by some unrelated decrement.
It does seem rather predictable for hardware memory corruption, though.
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