usb/126776: [umass/geom] confusing mixed output (but no panic!) after removing unmounted usb device

[Daniel]

>Number:         126776
>Category:       usb
>Synopsis:       [umass/geom] confusing mixed output (but no panic!) after removing unmounted usb device
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-usb
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Aug 24 10:00:11 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     Daniel
>Release:        FreeBSD 7.0-RELEASE
>Organization:
>Environment:
FreeBSD xyz 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:
Removing the usb flash drive produces a confusing output. 
There is NO kernel panic!
To see it better I label the usb device "XXXXXXXXXXX".
It does not matter if the device was mounted+unmount before removing. 

Problem occurs in FreeBSD 7.0 i386+amd64 with two different usb flash drives (128MB Twinmos and 1GB Sandisk).
No problem with FreeBSD 6.3 on the same machine.


plug in usb device:
-------------------
root: Unknown USB device: vendor 0x126f product 0x1325 bus uhub1
kernel: umass0: <TTI-MSA USB 2.0 Mobile Disk, class 0/0, rev 2.00/1.00, addr 2> on uhub1
kernel: da0 at umass-sim0 bus 0 target 0 lun 0
kernel: da0: <USB 2.0 Mobile Disk N4M 1.00> Removable Direct Access SCSI-2 device 
kernel: da0: 40.000MB/s transfers
kernel: da0: 122MB (249856 512 byte sectors: 64H 32S/T 122C)
kernel: GEOM_LABEL: Label for provider da0s1 is msdosfs/XXXXXXXXXXX.

mount -t msdosfs /dev/da0s1 /mnt/usb
------------------------------------
kernel: GEOM_LABEL: Label msdosfs/XXXXXXXXXXX removed.

umount /mnt/usb
---------------
kernel: GEOM_LABEL: Label for provider da0s1 is msdosfs/XXXXXXXXXXX.

remove the usb device - output on FreeBSD 7.0
-------------------------------------------------
kernel: umass0: at uhub1 port 4 (addr 2) disconnected
kernel: (da0:uGmEaOsMs_-LsAiBmE0L::0 :La0b:e0l) : mlsodsots fdse/vXiXcXeXX
kernel: XX(XdXaX0X: urmeamsosv-esdim.0:0:0:0): removing device entry
kernel: 
kernel: umass0: detached

It looks like the GEOM output ("GEOM_LABEL: Label msdosfs/XXXXXXXXXXX removed.") is written over the UMASS output.



remove the usb device - output on FreeBSD 6.3
-------------------------------------------------
kernel: umass0: at uhub1 port 4 (addr 2) disconnected
kernel: (da0:umass-sim0:0:0:0): lost device
kernel: (da0:umass-sim0:0:0:0): removing device entry
kernel: umass0: detached 



>How-To-Repeat:
plug in and remove the usb flash drive
>Fix:


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