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Date:      Wed, 27 Jul 2011 06:22:12 GMT
From:      tim newsham <tim.newsham+fbsd@gmail.com>
To:        freebsd-gnats-submit@FreeBSD.org
Subject:   amd64/159222: unusual behavior writing boot0 from single user mode
Message-ID:  <201107270622.p6R6MCae086774@red.freebsd.org>
Resent-Message-ID: <201107270630.p6R6U8Vk090201@freefall.freebsd.org>

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>Number:         159222
>Category:       amd64
>Synopsis:       unusual behavior writing boot0 from single user mode
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-amd64
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jul 27 06:30:08 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     tim newsham
>Release:        8.2
>Organization:
>Environment:
FreeBSD hpsux.x0d99.com 8.2-RELEASE FreeBSD 8.2-RELEASE #0: Thu Feb 17 02:41:51 UTC 2011     root@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64

>Description:
I boot single user, then I run "df" to see which disk is root.  Then I run:

   # fdisk -B -b /boot/boot0 /dev/da0

when its done it says "/boot/boot0: Device not configured" (error varies)
and then afterwards most commands I type (like "ls") ellicit: "vnode_pager_getpages: I/O read error" from the kernel.

I get the same behavior on my real machine as well as in vmware.  The vmware has a clean 8.2 release installed off of DVD (8.2 release disk) and then updated with "freebsd-update".

>How-To-Repeat:
Install 8.2 release for amd64.
Update with freebsd-update (I don't know if this matters).
Boot single user.
Run "fdisk -B -b /boot/boot0 /dev/da0" (or whatever the root disk drive is).
Run "ls" after it completes.
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted:



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