A common question is whether single bit (corrected) errors will
turn into double bit (uncorrected) errors. The answer is it
depends on the underlying cause of the memory error. There are
some errors that show up as single bits, especially transient
and soft errors, that do not degrade over time. There are other
failures that do degrade over time.
This sounds like one of our primary motivations for working on memory
hotplug remove. Detection of recoverable errors that degrade to
unrecoverable errors, but don't because we remove the memory before it
gets that far.
Much PPC64 hardware/firmware already supports this detection.
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