kern/120786: Kernelpanik when forced umount of a dettached USB Harddisk

[Gerhard Schmidt]

>Number:         120786
>Category:       kern
>Synopsis:       Kernelpanik when forced umount of a dettached USB Harddisk
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Feb 18 09:40:00 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     Gerhard Schmidt
>Release:        FreeBSD 6-STABLE.
>Organization:
Technische Universität münchen
>Environment:
FreeBSD etustar.ze.tum.de 6.3-PRERELEASE FreeBSD 6.3-PRERELEASE #2: Mon Nov 12 09:02:05 CET 2007     root at etustar.ze.tum.de:/usr/src/sys/i386/compile/ETUSTAR  i386
>Description:
I have an USB Harddisk mounted. It gets detached without propper umount.

umount the filesystem fails due to a readerror (expected) 

when i try a umount -f freebsd panics.

The same error in FreeBSD 7 
>How-To-Repeat:
mount an USB Harddisk 
diskconnect the Harddisk without umount 
umount -f the filesystem -> Crash 
>Fix:
n/k 

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