kern/142229: connecting a USB mouse to a Dell PE750 locks up kernel

[Paul Bransford]

>Number:         142229
>Category:       kern
>Synopsis:       connecting a USB mouse to a Dell PE750 locks up kernel
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Jan 02 06:00:10 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Paul Bransford
>Release:        8.0-RELEASE
>Organization:
>Environment:
FreeBSD pab3020.tpa.sagonet.com 8.0-RELEASE 8.0-RELEASE #0: Sat Nov 21 15:48:17 UTC 2009    root at almeida.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC    i386
>Description:
When trying to boot a Dell PowerEdge 750 with a Kensington Expert Mouse connected (usb trackball) the kernel freezes with the the last line printed:
ugen1.2: <Kensington> at usbus1
ums0: <Kensington Kensington Expert Mouse, class 0/0, rev 1.10/1.00, addr 2> on usbus1
ums0: 4 buttons and [XYZ] coordinates ID=0
<some filesystem related stuff, cleanup from last lockup. setting hostname etc>
Starting ums0 moused.

The kernel doesn't "unstick" when the device is unplugged, it must be power-cycled.

If the device is absent it will boot normally. However, upon connection, three lines will print and it will lock up as before:
ugen1.2: <Kensington> at usbus1
ums0: <Kensington Kensington Expert Mouse, class 0/0, rev 1.10/1.00, addr 2> on usbus1
ums0: 4 buttons and [XYZ] coordinates ID=0

This is the "stock" kernel that was installed by sysinstall. I do not have another USB mouse to test with. The USB keyboard connected appears to function without issue.

I've not written a FreeBSD problem report. Please advise if any more detail is required.
>How-To-Repeat:
Connect the Kensington Expert Mouse. No other action is required.
>Fix:


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