That looks like it just adds a class of errors, "deferred", without explanation, though this commit [1] implies that these are for ECC errors whose handling was

That looks like it just adds a class of errors, "deferred", without explanation, though this commit [1] implies that these are for ECC errors whose handling was not urgent, and does not specify further how those would occur (unless the MC knows something about the page being used for cache/re-readable data or something, so it can just drop the page on the floor and reread it). [1] - https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4838a0def07f5611347860b1fc0129c3fe77cc02 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux....