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Date: Thu, 2 Mar 2006 19:48:57 +0100
From: Marius Nuennerich <marius.nuennerich@gmx.net>
To: Martin <nakal@nurfuerspam.de>
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Cc: stable@freebsd.org
Subject: Re: Panics with md/gvinum/ufs
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On Thu, 02 Mar 2006 19:08:40 +0100
Martin <nakal@nurfuerspam.de> wrote:

> 
> Hi,
> 
> I've done some strange(?) experiments and I managed to get
> a panic of type "baddir" and just now another one that only
> rebooted my system instantly without writing a vmcore.
> 
> I don't know if this is important. I could not find any
> information on how gvinum detects failed hard disks.
> That's why I tried something really simple.
> 
> Steps to reproduce:
> 
> 1)
> dd if=/dev/zero of=a bs=1024 count=256000
> dd if=/dev/zero of=b bs=1024 count=256000
> dd if=/dev/zero of=c bs=1024 count=256000
> 
> 2)
> mdconfig -a -t vnode -u 0 -f a
> mdconfig -a -t vnode -u 1 -f b
> mdconfig -a -t vnode -u 2 -f c
> 
> 3)
> gvinum create raid5.conf
> 
> with raid5.conf:
> drive a device /dev/md0
> drive b device /dev/md1
> drive c device /dev/md2
> volume raid5
>          plex org raid5 491k
>          sd length 0 drive a
>          sd length 0 drive b
>          sd length 0 drive c
> 
> 4)
> newfs -m 0 /dev/raid5
> 
> 5)
> mount /dev/gvinum/raid5 /mnt/
> mkdir /mnt/aaa
> 
> 6)
> dd if=/dev/zero of=c bs=1024 count=256000
> 
> 7)
> cd /mnt/aaa
> touch a
> 
> 8)
> Repeat the steps 6) and 7) if it does not
> panic at this point.

Looks similar to the one I reported a few days ago:
http://lists.freebsd.org/pipermail/freebsd-geom/2006-March/001095.html

regards
Marius