usb/121168: Kernel panic when try to unmount removed usbdrive

[Octavian]

>Number:         121168
>Category:       usb
>Synopsis:       Kernel panic when try to unmount removed usbdrive
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-usb
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Feb 28 07:00:01 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     Octavian
>Release:        7.0 RELEASE (updated from RC2 with freebsd-update)
>Organization:
none
>Environment:
FreeBSD some.domain 7.0-RELEASE FreeBSD 7.0-RELEASE #0: Sun Feb 24 19:59:52 UTC 2008     root at logan.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386
>Description:
i got 2 kernel panics with some page faults.. when try to unmount an usbdrive
when it was removed physicaly from usb port.

>How-To-Repeat:
mount_msdosfs /dev/da0s1 /mnt/usbdrive/
cd /mnt/usbdrive
---(remove usbdrive from port)
umount -f /mnt/usbdrive

kernel panic...
>Fix:


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