kern/109377: unionfs crashes if underlying file system forcibly unmounted

[Craig Rodrigues]

>Number:         109377
>Category:       kern
>Synopsis:       unionfs crashes if underlying file system forcibly unmounted
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Feb 21 05:40:00 GMT 2007
>Closed-Date:
>Last-Modified:
>Originator:     Craig Rodrigues
>Release:        -CURRENT #2: Wed Feb 21 00:00:44 EST 2007
>Organization:
>Environment:
FreeBSD 7.0-CURRENT FreeBSD 7.0-CURRENT #2: Wed Feb 21 00:00:44 EST 2007   i386

>Description:
Kernel panics with following testcase, submitted by Peter Holm:

mount -t unionfs -o noatime /tmp /mnt 
umount -f /tmp 
mount /tmp
umount    /mnt

>How-To-Repeat:

>Fix:

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