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Date:      Mon, 02 Aug 2004 19:30:48 -0600
From:      Scott Long <>
To:        Daniel Eriksson <>
Cc:        'freebsd current' <>
Subject:   Re: Panic in today's current, UFS problem?
Message-ID:  <>

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Daniel Eriksson wrote:

> I was trying out the new patch from Ville-Pertti Keinonen that might fix my
> interrupt storm problems with SATA when I ran into a panic. The dmesg is
> attached.
> OS: CURRENT, 2004.
>     + VIA/SATA patch from Ville-Pertti Keinonen
> (
> nt)
>     + libdisk patch from Lukas Ertl
> (
> nt)
> What I did:
> 1. fdisk/label two 250GB discs hooked up to the on-board SATA controller
> (using sysinstall)
> 2. copy ~20GB of data to both discs

Is this step necessary in order to produce the panic?

> 3. successfully run the stress-test mentioned in Ville-Pertti Keinonen's
> mail (above)

Is this step necessary also?

> 4. unmount both discs
> 5. run "atacontrol create RAID0 128 ad20 ad22" (the two SATA discs)
> 6. fdisk/label the striped array (using sysinstall, forcing it to UFS1)
> 7. mount the new partition, and create three empty dirs
> 8. *boom*

How reproducable is this, and does it always panic in the same spot? 
There is definitely some sort of buffer corruption going on, and either 
it's happening in the buffer/cache layer or it's a bad DMA from the


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