ums panic

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After a fresh cvsup today, I was playing around with my mouse and managed to 
get a panic from ums.  I loaded usb/ums from a kernel module, started usbd, 
(mouse is working), unload ums, load ums -> panic so:
kldload ums
usbd
kldunload ums
kldload ums (panic)
The mouse was plugged in the entire time.

#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:240
#1  0xc01e62e2 in boot (howto=256) at /usr/src/sys/kern/kern_shutdown.c:372
#2  0xc01e6617 in panic () at /usr/src/sys/kern/kern_shutdown.c:550
#3  0xc0304406 in trap_fatal (frame=0xcd338ac8, eva=0)
    at /usr/src/sys/i386/i386/trap.c:821
#4  0xc03040a2 in trap_pfault (frame=0xcd338ac8, usermode=0, eva=522)
    at /usr/src/sys/i386/i386/trap.c:735
#5  0xc0303c65 in trap (frame=
      {tf_fs = 24, tf_es = 16, tf_ds = 16, tf_edi = -1024395648, tf_esi = 
- -1024395648, tf_ebp = -852260088, tf_isp = -852260108, tf_ebx = -842240968, 
tf_edx = -1070073024, tf_ecx = -1015545712, tf_eax = 518, tf_trapno = 12, 
tf_err = 0, tf_eip = -1015634330, tf_cs = 8, tf_eflags = 66054, tf_esp = 
- -852260052, tf_ss = -1029324969}) at /usr/src/sys/i386/i386/trap.c:420
#6  0xc02f4df8 in calltrap () at {standard input}:102
#7  0xc2a5bf57 in ums_match (self=0x0) at /usr/src/sys/dev/usb/ums.c:176
#8  0xc01fece8 in DEVICE_PROBE (dev=0xc2f0f680) at device_if.h:22
#9  0xc01fcb28 in device_probe_child (dev=0x0, child=0xc2f0f680)
    at /usr/src/sys/kern/subr_bus.c:1052
#10 0xc01fd32d in device_probe_and_attach (dev=0xc2f0f680)
    at /usr/src/sys/kern/subr_bus.c:1435
#11 0xc01fdd9e in bus_generic_driver_added (dev=0xc2f0f680, driver=0x0)
    at /usr/src/sys/kern/subr_bus.c:1859
#12 0xc01ff0af in BUS_DRIVER_ADDED (_dev=0xc327ab80, _driver=0x0)
    at /usr/src/sys/kern/subr_bus.c:587
#14 0xc01fe835 in driver_module_handler (mod=0xc2a9c140, what=0, 
    arg=0xc2a5e440) at /usr/src/sys/kern/subr_bus.c:2273
#15 0xc01dcbe1 in module_register_init (arg=0xc2a5e458)
    at /usr/src/sys/kern/kern_module.c:108
#16 0xc01d74c0 in linker_file_sysinit (lf=0x0)
    at /usr/src/sys/kern/kern_linker.c:192
#17 0xc01d7811 in linker_load_file (filename=0xc2474500 "/boot/kernel/ums.ko", 
    result=0xcd338ca4) at /usr/src/sys/kern/kern_linker.c:357
#18 0xc01d9d67 in linker_load_module (kldname=0xc036a7f0 "¯\2302À §6ÀÈ", 
    modname=0xc2474500 "/boot/kernel/ums.ko", parent=0x0, verinfo=0x0, 
    lfpp=0xcd338cd0) at /usr/src/sys/kern/kern_linker.c:1670
#19 0xc01d82f3 in kldload (td=0xc245fbe0, uap=0x0)
    at /usr/src/sys/kern/kern_linker.c:773
#20 0xc03046d3 in syscall (frame=
      {tf_fs = 47, tf_es = 47, tf_ds = 47, tf_edi = 0, tf_esi = -1077937308, 
tf_ebp = -1077937352, tf_isp = -852259468, tf_ebx = 0, tf_edx = 134576680, 
tf_ecx = 0, tf_eax = 304, tf_trapno = 12, tf_err = 2, tf_eip = 134513967, 
tf_cs = 31, tf_eflags = 531, tf_esp = -1077937396, tf_ss = 47})
    at /usr/src/sys/i386/i386/trap.c:1008
#21 0xc02f4e4d in Xint0x80_syscall () at {standard input}:144

- -- 
Anish Mistry
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