On Mon, Sep 20, 2021 at 10:37 AM Chris Murphy [off-list ref] wrote:

https://bugzilla.redhat.com/show_bug.cgi?id=2005987

The downstream bug has been updated. The problem does seem to be with
the drive itself failing reads.

[2634355.708201] sd 2:0:0:0: [sda] tag#0 FAILED Result:
hostbyte=DID_OK driverbyte=DRIVER_SENSE cmd_age=30s
[2634355.708209] sd 2:0:0:0: [sda] tag#0 Sense Key : Illegal Request [current]
[2634355.708214] sd 2:0:0:0: [sda] tag#0 Add. Sense: Unaligned write command

I think it's fair to say, readahead or no, it's a read io error that
Btrfs probably ought to track even though there's also some pretty
obvious hardware issues occurring with the drive too.


-- 
Chris Murphy