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Date:      Fri, 8 Dec 2000 18:16:45 +0100
From:      Wilko Bulte <wkb@freebie.demon.nl>
To:        Mike Smith <msmith@freebsd.org>
Cc:        Tomi.Vainio@Sun.COM, freebsd-stable@freebsd.or, freebsd-current@freebsd.org
Subject:   Re: ffs_valloc: dup alloc panics with stable/current
Message-ID:  <20001208181645.E6118@freebie.demon.nl>
In-Reply-To: <200012081045.eB8Aj0F10483@mass.osd.bsdi.com>; from msmith@freebsd.org on Fri, Dec 08, 2000 at 02:45:00AM -0800
References:  <14896.15612.659070.165662@ultrahot.Finland.Sun.COM> <200012081045.eB8Aj0F10483@mass.osd.bsdi.com>

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On Fri, Dec 08, 2000 at 02:45:00AM -0800, Mike Smith wrote:
> > We got old Mylex DAC960PD-Ultra-raid-adapter and have tried to use it
> > with FreeBSD 4.2-stable and 5.0-current. Adapter is configured with
> > three luns 5+5*9G, 8+8*9G (raid5) and 1+1*2G (mirrored boot disk).
> > All 9G disks are quite old Seagate Barracuda 9 disks ST19171W.  System
> > is working quite well but under heavier load we start to get scsi
> > errors from luns.
> > sense = 4 asc = 3 asq = 0
> > sense = 1 asc = 3 asq = 0
> > sense = 3 asc = 12 asq = 0
> > sense = 3 asc = 11 asq = 0
> 
> Your disks just aren't up to this sort of workload.
> 
> > This is not so bad but 5-30 minutes after this command system will
> > always panic.
> > cd /uu ; dump 0buf 126 - /w | restore xbf 126 -
> > 
> > mode = 0100644, inum = 720391, fs = /uu
> > panic: ffs_valloc: dup alloc
> 
> This looks like memory or PCI data corruption.  You don't say how you're 
> generating this load, or what the motherboard is, but I suspect that you 
> may have hardware issues here.

PCI bus clock is at the nominal speed? Can be a source of interesting
effects.

-- 
Wilko Bulte  	 					Arnhem, the Netherlands
wilko@freebsd.org  	http://www.freebsd.org 		http://www.nlfug.nl



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