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Date: Wed, 6 Dec 2000 11:41:51 -0800 (PST)
From: Andre Hedrick <andre@linux-ide.org>
To: "Udo A. Steinberg" <sorisor@Hell.WH8.TU-Dresden.De>
cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: Trashing ext2 with hdparm
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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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