[253981.512570] sd 5:0:0:0: [sdf]
[253970.368375] Add. Sense: Unrecovered read error - auto reallocate failed
[253970.368380] end_request: I/O error, dev sdf, sector 5680577752

I'm confused. The above happens twice. So it seems clear the problem is
with /dev/sdf and sector 5680577752. Since it's an AF drive, technically
sectors 5680577752 - 5680577760 are affected, since those are the LBA's for
a single physical sector.

However, all of the "read error corrected" that follow have completely
different values, 5478837464 through 547883753.

And then 3 seconds later another read error at the same LBA:

[253977.980604] sd 5:0:0:0: [sdf]
253977.980605] Add. Sense: Unrecovered read error - auto reallocate failed
[253977.980612] end_request: I/O error, dev sdf, sector 5680579352

and 4 seconds later

[253981.512576] sd 5:0:0:0: [sdf]
[253981.512577] Add. Sense: Unrecovered read error - auto reallocate failed
[253981.512582] end_request: I/O error, dev sdf, sector 5680579352


And then "read error corrected" 5478839064 through 5478839136 which are
different than the first batch.

So there's a single LBA reported by libata as URE multiple times, each with
identical address. But then two corrected events, each with a different
range of sectors, neither of which match the URE address.

??


Chris Murphy