Kjetil Torgrim Homme <kjetilho(at)ifi(dot)uio(dot)no> writes:
> [Tom Lane]:
>> So somehow, the byte at page offset 0fff got changed
>> from 00 to 2f in memory, though not on disk.
> indeed interesting. IMHO 0x0fff sounds more like a write to -1
> (relative to the next page) than a random memory error.
Note though that that offset is only special with respect to locations
on disk; it was not a special address in memory. I'm wondering about
transient flakiness in your disk drive controller causing it to
sometimes return bad data. Have you run any read/write disk tests?
regards, tom lane