usb stick/hub detach panic

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

hey,

100% reproducible panic on detach of my usb stick.  ehci is loaded as well.  UP system.

#12 0xc0194734 in kprintf (fmt=0xdeadc0de <Address 0xdeadc0de out of bounds>)
   at /usr/build/src/sys/kern/subr_prf.c:304
#13 0xc0260cfd in usb_disconnect_port (up=0xc415a178, parent=0xdeadc0de)
   at /usr/build/src/sys/bus/usb/usb_subr.c:1382
#14 0xc02621a3 in uhub_detach (self=0xc415a100) at /usr/build/src/sys/bus/usb/uhub.c:610
#15 0xc018d9ae in device_detach (dev=0xc415a100) at device_if.h:48
#16 0xc018cef9 in device_delete_child (dev=0xdeadc0de, child=0xc415a100)
   at /usr/build/src/sys/kern/subr_bus.c:591
#17 0xc0260d4b in usb_disconnect_port (up=0xc698b1f4, parent=0xdeadc0de)
   at /usr/build/src/sys/bus/usb/usb_subr.c:1387
#18 0xc0261f33 in uhub_explore (dev=0xc4139940) at /usr/build/src/sys/bus/usb/uhub.c:460
#19 0xc025c6b7 in usb_discover (v=0xc695d9e0) at /usr/build/src/sys/bus/usb/usb.c:780
#20 0xc025bf71 in usb_event_thread (arg=0xc695d9e0) at /usr/build/src/sys/bus/usb/usb.c:469

gdb is broken somehow, the 0xdeadc0de arguments are not true, except for for kprintf.

(kgdb) fra 13
#13 0xc0260cfd in usb_disconnect_port (up=0xc415a178, parent=0xdeadc0de)
   at /usr/build/src/sys/bus/usb/usb_subr.c:1382
1382                            kprintf("%s: at %s", USBDEVPTRNAME(dev->subdevs[i]),
(kgdb) p dev->subdevs[0]
$1 = 0xc415a190
(kgdb) p *dev->subdevs[0]
$2 = {ops = 0xc415abf8, link = {tqe_next = 0xdeadc0de, tqe_prev = 0xdeadc0de}, 
 parent = 0xdeadc0de, children = {tqh_first = 0xdeadc0de, tqh_last = 0xdeadc0de}, 
 driver = 0xdeadc0de, devclass = 0xdeadc0de, unit = -559038242, 
 nameunit = 0xdeadc0de <Address 0xdeadc0de out of bounds>, 
 desc = 0xdeadc0de <Address 0xdeadc0de out of bounds>, busy = -559038242, state = 3735929054, 
 devflags = 3735929054, flags = 49374, order = 173 '�', pad = 222 '�, ivars = 0xdeadc0de, 
 softc = 0x0}

this stick has an integrated usb hub.

dump arriving on leaf at ~corecode/crash/*13*

cheers
 simon

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