From owner-freebsd-stable@FreeBSD.ORG  Tue Jun 29 00:24:39 2004
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Date: Mon, 28 Jun 2004 17:24:39 -0700 (PDT)
From: Doug White <dwhite@gumbysoft.com>
To: Vladimir Zhurov <vzhurov@uwo.ca>
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Subject: Re: dscheck(#ar/2): negative b_blkno error on FreeBSD-4.10-STABLE
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On Sun, 27 Jun 2004, Vladimir Zhurov wrote:

> Hello,
>
> Today's /var/log/messages and /var/log/dmesg.today got filled with:
>
> dmesg.today:
> dscheck(#ar/2): negative b_blkno -1721888480
>
> messages:
> /kernel: dscheck(#ar/2): negative b_blkno -1721888480

I've seen this if the array or partition table is corrupted. The check is
at the front of dscheck() in src/sys/kern/subr_diskslice.c.  You might
make sure your raid array is functioning normally and the fdisk table
hasn't been spammed.

> Does anyone know what is the reason for such error and whether it is
> critical?

It shouldn't happen -- you might go exploring with fdisk(8).

-- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite@gumbysoft.com          |  www.FreeBSD.org