To someone who isn't looking for RAM/ cache issues as the root cause, those often look just like filesystem corruption of whatever kind. They try to open a file, get an error saying it's corrupted. Or they run a program and it mysteriously crashes.
If you _already know_ you have bad RAM, then you say "Ha, bitflip in page cache" and maybe you flush a cache and try again. But if you've already begun to harbour doubts about Seagate disks, or Dell RAID controllers, or XFS then of course that's what you will tend to blame for the problem.
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