Under 05-Oct-2010 snapshot:

1. Plug in urtw device (I have a LevelOne device, don't know model as
its plastic body is lost).
2. Start bittorrent client (or ftp or whatever loading urtw device).
3. Plug in any usb device - device doesn't get configured, lines not
appended to dmesg, usbdevs hangs, otherwise operating system fully
operational.
4. Stop loading urtw device.
5. Plug in and out any usb device - device gets configured, lines
appended to dmesg.

Couldn't reproduce it with my 3COM 3RUSB10075 as it gets device
timeout shortly and stops operating at all. As I have no other usb
WiFi devices, can't say whether the problem is urtw-specific, or is
valid for any usb WiFi or just urtw (or just my urtw).

% usbdevs -dv
Controller /dev/usb0:
addr 1: high speed, self powered, config 1, EHCI root hub(0x0000),
Intel(0x8086), rev 1.00
  uhub0
 port 1 addr 2: high speed, power 98 mA, config 1, WebCam(0x62c0),
Sonix Technology Co., Ltd.(0x0c45), rev 1.00
   uvideo0
 port 2 powered
 port 3 powered
 port 4 powered
 port 5 addr 3: high speed, power 100 mA, unconfigured,
RTL8187(0x8187), Realtek(0x0bda), rev 1.00, iSerialNumber 00116B1604AE
   urtw0
 port 6 powered
 port 7 powered
 port 8 powered
Controller /dev/usb1:
addr 1: full speed, self powered, config 1, UHCI root hub(0x0000),
Intel(0x8086), rev 1.00
  uhub1
 port 1 powered
 port 2 addr 2: low speed, power 100 mA, config 1, Optical
Mouse(0x003a), Genius(0x0458), rev 1.00
   uhidev0
Controller /dev/usb2:
addr 1: full speed, self powered, config 1, UHCI root hub(0x0000),
Intel(0x8086), rev 1.00
  uhub2
 port 1 powered
 port 2 powered
Controller /dev/usb3:
addr 1: full speed, self powered, config 1, UHCI root hub(0x0000),
Intel(0x8086), rev 1.00
  uhub3
 port 1 powered
 port 2 powered
Controller /dev/usb4:
addr 1: full speed, self powered, config 1, UHCI root hub(0x0000),
Intel(0x8086), rev 1.00
  uhub4
 port 1 powered
 port 2 powered

dmesg (05-Oct-2010 snapshot), notice no dmesg lines between inserting
and removing flash usb module:

OpenBSD 4.8-current (GENERIC.MP) #456: Tue Oct  5 20:18:06 MDT 2010
    dera...@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC.MP
RTC BIOS diagnostic error 80<clock_battery>
cpu0: Intel(R) Atom(TM) CPU N270 @ 1.60GHz ("GenuineIntel" 686-class) 1.60 GHz
cpu0: 
FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,EST,TM2,SSSE3,xTPR,PDCM,MOVBE
real mem  = 1060163584 (1011MB)
avail mem = 1032794112 (984MB)
mainbus0 at root
bios0 at mainbus0: AT/286+ BIOS, date 10/06/08, SMBIOS rev. 2.4 @
0xe91c0 (31 entries)
bios0: vendor Acer version "v0.3110" date 10/06/2008
bios0: Acer AO531h
acpi0 at bios0: rev 2
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP SSDT HPET APIC MCFG ASF! SLIC BOOT
acpi0: wakeup devices P32_(S4) UHC1(S3) UHC2(S3) UHC3(S3) UHC4(S3)
ECHI(S3) EXP1(S4) EXP2(S4) EXP3(S4) EXP4(S4) AZAL(S0) MODM(S0)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpihpet0 at acpi0: 14318179 Hz
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: apic clock running at 133MHz
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Atom(TM) CPU N270 @ 1.60GHz ("GenuineIntel" 686-class) 1.60 GHz
cpu1: 
FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,EST,TM2,SSSE3,xTPR,PDCM,MOVBE
ioapic0 at mainbus0: apid 4 pa 0xfec00000, version 20, 24 pins
ioapic0: misconfigured as apic 0, remapped to apid 4
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus 3 (P32_)
acpiprt2 at acpi0: bus 1 (EXP1)
acpiprt3 at acpi0: bus -1 (EXP2)
acpiprt4 at acpi0: bus -1 (EXP3)
acpiprt5 at acpi0: bus 2 (EXP4)
acpiec0 at acpi0
acpicpu0 at acpi0: C3, C2, C1, PSS
acpicpu1 at acpi0: C3, C2, C1, PSS
acpitz0 at acpi0: critical temperature 95 degC
acpibtn0 at acpi0: PWRB
acpibtn1 at acpi0: LID0
acpibtn2 at acpi0: SLPB
acpibat0 at acpi0: BAT1 not present
acpiac0 at acpi0: AC unit online
acpivideo0 at acpi0: OVGA
acpivout0 at acpivideo0: CRT1
acpivout1 at acpivideo0: DTV1
acpivout2 at acpivideo0: DFP1
acpivout3 at acpivideo0: LCD_
acpivout4 at acpivideo0: DTV2
acpivout5 at acpivideo0: DFP2
bios0: ROM list: 0xc0000/0xec00!
cpu0: Enhanced SpeedStep 1597 MHz: speeds: 1600, 1333, 1066, 800 MHz
pci0 at mainbus0 bus 0: configuration mode 1 (bios)
pchb0 at pci0 dev 0 function 0 "Intel 82945GME Host" rev 0x03
vga1 at pci0 dev 2 function 0 "Intel 82945GME Video" rev 0x03
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
intagp0 at vga1
agp0 at intagp0: aperture at 0x40000000, size 0x10000000
inteldrm0 at vga1: apic 4 int 16 (irq 11)
drm0 at inteldrm0
"Intel 82945GM Video" rev 0x03 at pci0 dev 2 function 1 not configured
azalia0 at pci0 dev 27 function 0 "Intel 82801GB HD Audio" rev 0x02:
apic 4 int 16 (irq 11)
azalia0: codecs: Realtek ALC272
audio0 at azalia0
ppb0 at pci0 dev 28 function 0 "Intel 82801GB PCIE" rev 0x02: apic 4
int 16 (irq 255)
pci1 at ppb0 bus 1
ale0 at pci1 dev 0 function 0 "Attansic Technology L1E" rev 0xb0:
AR8113, apic 4 int 16 (irq 11), address 00:26:9e:00:53:d1
atphy0 at ale0 phy 0: F1 10/100/1000 PHY, rev. 9
ppb1 at pci0 dev 28 function 3 "Intel 82801GB PCIE" rev 0x02: apic 4
int 19 (irq 255)
pci2 at ppb1 bus 2
uhci0 at pci0 dev 29 function 0 "Intel 82801GB USB" rev 0x02: apic 4
int 16 (irq 11)
uhci1 at pci0 dev 29 function 1 "Intel 82801GB USB" rev 0x02: apic 4
int 17 (irq 11)
uhci2 at pci0 dev 29 function 2 "Intel 82801GB USB" rev 0x02: apic 4
int 18 (irq 11)
uhci3 at pci0 dev 29 function 3 "Intel 82801GB USB" rev 0x02: apic 4
int 19 (irq 11)
ehci0 at pci0 dev 29 function 7 "Intel 82801GB USB" rev 0x02: apic 4
int 16 (irq 11)
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb2 at pci0 dev 30 function 0 "Intel 82801BAM Hub-to-PCI" rev 0xe2
pci3 at ppb2 bus 3
ichpcib0 at pci0 dev 31 function 0 "Intel 82801GBM LPC" rev 0x02: PM disabled
pciide0 at pci0 dev 31 function 1 "Intel 82801GB IDE" rev 0x02: DMA,
channel 0 configured to compatibility, channel 1 configured to
compatibility
pciide0: channel 0 disabled (no drives)
pciide0: channel 1 ignored (disabled)
ahci0 at pci0 dev 31 function 2 "Intel 82801GBM AHCI" rev 0x02: apic 4
int 17 (irq 11), AHCI 1.1
scsibus0 at ahci0: 32 targets
sd0 at scsibus0 targ 0 lun 0: <ATA, ST9160310AS, 0303> SCSI3 0/direct fixed
sd0: 152627MB, 512 bytes/sec, 312581808 sec total
ichiic0 at pci0 dev 31 function 3 "Intel 82801GB SMBus" rev 0x02: apic
4 int 17 (irq 11)
iic0 at ichiic0
spdmem0 at iic0 addr 0x51: 1GB DDR2 SDRAM non-parity PC2-5300CL5 SO-DIMM
usb1 at uhci0: USB revision 1.0
uhub1 at usb1 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb2 at uhci1: USB revision 1.0
uhub2 at usb2 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb3 at uhci2: USB revision 1.0
uhub3 at usb3 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb4 at uhci3: USB revision 1.0
uhub4 at usb4 "Intel UHCI root hub" rev 1.00/1.00 addr 1
isa0 at ichpcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pms0 at pckbc0 (aux slot)
pckbc0: using irq 12 for aux slot
wsmouse0 at pms0 mux 0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16
mtrr: Pentium Pro MTRR support
uvideo0 at uhub0 port 1 configuration 1 interface 0 "Sonix Technology
Co., Ltd. WebCam" rev 2.00/1.00 addr 2
video0 at uvideo0
umass0 at uhub0 port 3 configuration 1 interface 0 "HTC Android Phone"
rev 2.00/1.00 addr 3
umass0: using SCSI over Bulk-Only
scsibus1 at umass0: 2 targets, initiator 0
sd1 at scsibus1 targ 1 lun 0: <HTC, Android Phone, 0100> SCSI2
0/direct removable
sd1: drive offline
uhidev0 at uhub1 port 2 configuration 1 interface 0 "Genius Optical
Mouse" rev 1.10/1.00 addr 2
uhidev0: iclass 3/1
ums0 at uhidev0: 3 buttons, Z dir
wsmouse1 at ums0 mux 0
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
root on sd0a swap on sd0b dump on sd0b
urtw0 at uhub0 port 5 "Realtek RTL8187" rev 2.00/1.00 addr 3
urtw0: RTL8187 rev 0x04, RFv2, address 00:11:6b:16:04:ae
umass0 at uhub0 port 3 configuration 1 interface 0 " USB FLASH DRIVE"
rev 2.00/1.00 addr 4
umass0: using SCSI over Bulk-Only
scsibus1 at umass0: 2 targets, initiator 0
sd1 at scsibus1 targ 1 lun 0: <, USB FLASH DRIVE, PMAP> SCSI0 0/direct removable
sd1: 984MB, 512 bytes/sec, 2015232 sec total
sd1 detached
scsibus1 detached
umass0 detached
Data modified on freelist: word 5 of object 0xd24ec000 size 0xffc
previous type devbuf (0xefffeecb != 0xefffeecc)
ehci_idone: ex=0xd20b2800 is done!
urtw0 detached
umass0 at uhub0 port 3 configuration 1 interface 0 " USB FLASH DRIVE"
rev 2.00/1.00 addr 3
umass0: using SCSI over Bulk-Only
scsibus1 at umass0: 2 targets, initiator 0
sd1 at scsibus1 targ 1 lun 0: <, USB FLASH DRIVE, PMAP> SCSI0 0/direct removable
sd1: 984MB, 512 bytes/sec, 2015232 sec total
sd1 detached
scsibus1 detached
umass0 detached
urtw0 at uhub0 port 5 "Realtek RTL8187" rev 2.00/1.00 addr 3
urtw0: RTL8187 rev 0x04, RFv2, address 00:11:6b:16:04:ae

-- 
Dmitrij D. Czarkoff

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