Re: LibPATA code issues / 2.6.15.4

[Mark Lord <lkml@rtr.ca>]

David Greaves wrote:
> Mark Lord wrote:
>
> > > sdb: Current: sense key: Medium Error
> > >     Additional sense: Unrecovered read error - auto reallocate failed
> > > end_request: I/O error, dev sdb, sector 398283329
> > > raid1: Disk failure on sdb2, disabling device.
> > >         Operation continuing on 1 devices
..
> > The command failing above is SCSI WRITE_10, which is being
> > translated into ATA_CMD_WRITE_FUA_EXT by libata.
> >
> > This command fails -- unrecognized by the drive in question.
> > But libata reports it (most incorrectly) as a "medium error",
> > and the drive is taken out of service from its RAID.
> >
> > Bad, bad, and worse.
..
> Thanks Mark
>
> I'm glad it's a bug and not bad hardware.
>
> I am quite concerned that the basic effect of just booting a practically
> vanilla 2.6.16-rc4 like this was to fry my raid array.
>
> Luckily it dropped 2 (of  3) disks so quickly that the event counter was
> the same allowing an easy rebuild.
>
> 2.6.15 has similar issues but they seem to happen *very* infrequently by
> comparison - this hit me several times during a single boot.
>
> Should Linus (cc'ed) hold off on 2.6.16 because of this or not?

Well, no doubt whatsoever about it being a "regression",
since the FUA code is *new* in 2.6.16 (not present in 2.6.15).

The FUA code should either get fixed, or removed from 2.6.16.

Cheers
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