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SubjectRe: Trashing ext2 with hdparm

No way that this could cause corruption it is a read-only test.

On Wed, 6 Dec 2000, Udo A. Steinberg wrote:

>
> Hi,
>
> Following the discussion in another thread where someone
> reported fs corruption when enabling DMA with hdparm, I've
> played around with hdparm and found that even the rather
> harmless hdparm operations are capable of trashing an ext2
> filesystem quite nicely.
>
> hdparm version is 3.9
>
> hdparm -tT /dev/hdb1 does the trick here.
>
> After that, several files are corrupted, such as /etc/mtab.
> Reboot+fsck fixes the problem, however e2fsck never finds
> any errors in the fs on disk.
>
> I'm quite sure that earlier kernel versions didn't exhibit
> this kind of behaviour, although I'm not quite sure at
> which point things started to break. I have test12-pre6
> here atm, but I have test-11 still lying around and will
> test that in a bit.
>
> The drive in question is an IBM-DTLA307030 running in
> UDMA Mode 5 on a PDC20265, chipset revision 2.
>
> I haven't seen any other corruption other than that which
> hdparm reliably triggers. Might as well be a bug in hdparm,
> so someone else might also want to check...
>
> -Udo.
> -
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>

Andre Hedrick
CTO Timpanogas Research Group
EVP Linux Development, TRG
Linux ATA Development

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