r291431 urtwn usb errors, cannot allocate device

Updated to r291431 from about a month ago.
USB wireless stopped working:

ugen0.2: <vendor 0x0b05> at usbus0
urtwn0: <vendor 0x0b05 product 0x17ba, class 0/0, rev 2.00/2.00, addr 1> on usbus0
urtwn0: MAC/BB RTL8188CUS, RF 6052 1T1R
ugen1.2: <vendor 0x8087> at usbus1
uhub2: <vendor 0x8087 product 0x8000, class 9/0, rev 2.00/0.04, addr 2> on usbus1
uhub2: 8 ports with 8 removable, self powered
ugen1.3: <CN0FHKK7724874AHE0YZA00> at usbus1
wlan0: Ethernet address: 1c:87:2c:c7:c2:6e
usbd_setup_device_desc: getting device descriptor at addr 2 failed, USB_ERR_IOERROR
usbd_setup_device_desc: getting device descriptor at addr 2 failed, USB_ERR_IOERROR
usbd_setup_device_desc: getting device descriptor at addr 2 failed, USB_ERR_IOERROR
usbd_setup_device_desc: getting device descriptor at addr 2 failed, USB_ERR_IOERROR
wlan0: link state changed to UP
usbd_setup_device_desc: getting device descriptor at addr 2 failed, USB_ERR_IOERROR
ugen0.3: <Unknown> at usbus0 (disconnected)
uhub_reattach_port: could not allocate new device
ugen0.3: <Sierra Wireless, Incorporated> at usbus0
em0: link state changed to UP
lock order reversal:
 1st 0xfffffe01eb862e00 bufwait (bufwait) _at_ /usr/src/sys/kern/vfs_bio.c:3476
 2nd 0xfffff80004852000 dirhash (dirhash) _at_ /usr/src/sys/ufs/ufs/ufs_dirhash.c:281
stack backtrace:
#0 0xffffffff80a7b270 at witness_debugger+0x70
#1 0xffffffff80a7b171 at witness_checkorder+0xe71
#2 0xffffffff80a28a42 at _sx_xlock+0x72
#3 0xffffffff80cc086d at ufsdirhash_add+0x3d
#4 0xffffffff80cc371f at ufs_direnter+0x62f
#5 0xffffffff80ccbc2a at ufs_mkdir+0x8ba
#6 0xffffffff80fb4ac7 at VOP_MKDIR_APV+0xf7
#7 0xffffffff80ae0fd9 at kern_mkdirat+0x209
#8 0xffffffff80e6a4fe at amd64_syscall+0x2de
#9 0xffffffff80e495ab at Xfast_syscall+0xfb
wlan0: link state changed to DOWN

Have I missed something?

$  cat /boot/loader.conf 
kern.vty=vt
linux_load="YES"
geom_bde_load="YES"
cuse4bsd_load="YES"
if_urtwn_load="YES"
legal.realtek.license_ack=1
urtwn-rtl8192cfwT_load="YES"


Thanks

Anton