i386/108694: freebsd reboots

[jernej]

>Number:         108694
>Category:       i386
>Synopsis:       freebsd reboots
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Feb 02 17:20:14 GMT 2007
>Closed-Date:
>Last-Modified:
>Originator:     jernej
>Release:        6.2-stable
>Organization:
>Environment:
FreeBSD toaster.nimam 6.2-RELEASE FreeBSD 6.2-RELEASE #0: Fri Jan 12 10:40:27 UTC 2007     root at dessler.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386

>Description:
1. mounting usb-stick
2. detaching usb-stick without "umount"
3. "umount /mnt/usb" -> "device busy"
4. sticking usb-stick back in
5. trying to unmount it "umount /mnt/usb" -> "device busy"
6. trying "umount /dev/da0"
7. nothing responds
8. FreeBSD reboots
>How-To-Repeat:
1. stick in USB-key
2. "mount -t msdos /dev/da0 /mnt/usb"
3. take it out without unmounting it first
4. "umount /mnt/usb"
5. "umount /dev/da0"
6. stick it back
7. repeat 4,5
>Fix:

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