i386/87859: System reboot while umount smbfs.

[YuHong]

>Number:         87859
>Category:       i386
>Synopsis:       System reboot while umount smbfs.
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Oct 23 04:50:16 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     YuHong
>Release:        5.4 Stable
>Organization:
Junction.co,ltd, china
>Environment:
FreeBSD bsd.junction.com 5.4-STABLE FreeBSD 5.4-STABLE #2: Fri Oct 21 18:50:57 CST 2005     root at bsd.junction.com:/usr/obj/usr/src/sys/bsd  i386
>Description:
system will reboot while umount smbfs after network broken.
>How-To-Repeat:
1. mount_smbfs -N //lyx/download /mnt
2. close windows xp machine.(broken network)
3. umount /mnt (system will reboot)
>Fix:
              
>Release-Note:
>Audit-Trail:
>Unformatted: