Hello,
When a USB-Ethernet dongle (ure driver) is plugged in
to a Raspberry Pi 4b, the on-board Wifi blocks. There are
no error messages and no changes to the bwfm0 Wifi
interface that I have noticed. Removing the dongle
unblocks the Wifi.
The on-board Ethernet bse0 remains unaffected.
I have reproduced the problem in OpenBSD 7.9 & 8.0.
The USB-Ethernet dongle is a tp-link UE-300. I have two,
same behaviour with both.
There is no Ethernet cable connected to the dongle during
these tests.
Enabling debug on the interfaces ure0 and
bwfm0 (ifconfig <if> debug) shows nothing of interest.
Problem exists with bwfm0 in AP mode as well as client
mode.
The problem does not occur on Raspberry Pi OS.
See attachment.
Redactions marked with XXX.
Comments marked with YYY.
Thanks,
Aaron.
DMESG OUTPUT:
rpgw# dmesg
OpenBSD 8.0 (GENERIC.MP) #1: Mon Oct 19 12:58:44 MDT 2026
[email protected]:/usr/src/sys/arch/arm64/compile/GENERIC.MP
real mem = 4146515968 (3954MB)
avail mem = 3929604096 (3747MB)
random: good seed from bootblocks
mainbus0 at root: Raspberry Pi 4 Model B Rev 1.2
efi0 at mainbus0: UEFI 2.11
efi0: Das U-Boot rev 0x20260700
smbios0 at efi0: SMBIOS 3.7.0
smbios0: vendor U-Boot version "2026.07" date 07/01/2026
smbios0: raspberrypi Raspberry Pi 4 Model B Rev 1.2
cpu0 at mainbus0 mpidr 0: ARM Cortex-A72 r0p3
cpu0: 48KB 64b/line 3-way L1 PIPT I-cache, 32KB 64b/line 2-way L1 D-cache
cpu0: 1024KB 64b/line 16-way L2 cache
cpu0: CRC32,ASID16
cpu1 at mainbus0 mpidr 1: ARM Cortex-A72 r0p3
cpu1: 48KB 64b/line 3-way L1 PIPT I-cache, 32KB 64b/line 2-way L1 D-cache
cpu1: 1024KB 64b/line 16-way L2 cache
cpu2 at mainbus0 mpidr 2: ARM Cortex-A72 r0p3
cpu2: 48KB 64b/line 3-way L1 PIPT I-cache, 32KB 64b/line 2-way L1 D-cache
cpu2: 1024KB 64b/line 16-way L2 cache
cpu3 at mainbus0 mpidr 3: ARM Cortex-A72 r0p3
cpu3: 48KB 64b/line 3-way L1 PIPT I-cache, 32KB 64b/line 2-way L1 D-cache
cpu3: 1024KB 64b/line 16-way L2 cache
"linux,cma" at mainbus0 not configured
"nvram" at mainbus0 not configured
"nvram" at mainbus0 not configured
apm0 at mainbus0
"system" at mainbus0 not configured
"axi" at mainbus0 not configured
simplebus0 at mainbus0: "soc"
bcmclock0 at simplebus0
bcmmbox0 at simplebus0
bcmgpio0 at simplebus0
bcmaux0 at simplebus0
ampintc0 at simplebus0 nirq 256, ncpu 4 ipi 0: "interrupt-controller"
bcmtmon0 at simplebus0
bcmdmac0 at simplebus0: DMA0 DMA2 DMA4 DMA5 DMA6 DMA7 DMA8 DMA9 DMA10
pluart0 at simplebus0: rev 3, 32 byte fifo
pluart0: console
"interrupt-controller" at simplebus0 not configured
bcmdog0 at simplebus0
bcmirng0 at simplebus0
"firmware" at simplebus0 not configured
"power" at simplebus0 not configured
"mailbox" at simplebus0 not configured
sdhc0 at simplebus0
sdhc0: SDHC 3.00, 250 MHz base clock
sdmmc0 at sdhc0: 4-bit, sd high-speed, mmc high-speed
"gpiomem" at simplebus0 not configured
"fb" at simplebus0 not configured
simplebus1 at simplebus0: "nvmem"
"nvmem_otp" at simplebus1 not configured
"nvmem_cust" at simplebus1 not configured
"nvmem_priv" at simplebus1 not configured
simplebus2 at mainbus0: "clocks"
"clk-osc" at simplebus2 not configured
"clk-usb" at simplebus2 not configured
"phy" at mainbus0 not configured
"clk-27M" at mainbus0 not configured
"clk-108M" at mainbus0 not configured
simplebus3 at mainbus0: "emmc2bus"
sdhc1 at simplebus3
sdhc1: SDHC 3.00, 100 MHz base clock
sdmmc1 at sdhc1: 8-bit, sd high-speed, mmc high-speed, ddr52, dma
"pmu" at mainbus0 not configured
agtimer0 at mainbus0: 54000 kHz
simplebus4 at mainbus0: "scb"
bcmpcie0 at simplebus4
pci0 at bcmpcie0
ppb0 at pci0 dev 0 function 0 "Broadcom BCM2711" rev 0x10
pci1 at ppb0 bus 1
xhci0 at pci1 dev 0 function 0 "VIA VL805 xHCI" rev 0x01: intx, xHCI 1.0
usb0 at xhci0: USB revision 3.0
uhub0 at usb0 configuration 1 interface 0 "VIA xHCI root hub" rev 3.00/1.00
addr 1
bse0 at simplebus4: address dc:a6:XXX
brgphy0 at bse0 phy 1: BCM54210E, rev. 2
"codec" at simplebus4 not configured
"dma" at simplebus4 not configured
gpioleds0 at mainbus0: "ACT", "PWR"
"cam_dummy_reg" at mainbus0 not configured
"regulator-cam1" at mainbus0 not configured
"regulator-sd-io-1v8" at mainbus0 not configured
"regulator-sd-vcc" at mainbus0 not configured
"fixedregulator_3v3" at mainbus0 not configured
"fixedregulator_5v0" at mainbus0 not configured
"zone_dma" at mainbus0 not configured
simplebus5 at mainbus0: "v3dbus"
scsibus0 at sdmmc1: 2 targets, initiator 0
sd0 at scsibus0 targ 1 lun 0: <Sandisk, SL08G, 0080> removable
sd0: 7580MB, 512 bytes/sector, 15523840 sectors
uhub1 at uhub0 port 1 configuration 1 interface 0 "VIA Labs USB2.0 Hub" rev
2.10/4.21 addr 2
bwfm0 at sdmmc0 function 1
manufacturer 0x02d0, product 0xa9a6 at sdmmc0 function 2 not configured
manufacturer 0x02d0, product 0xa9a6 at sdmmc0 function 3 not configured
vscsi0 at root
scsibus1 at vscsi0: 256 targets
softraid0 at root
scsibus2 at softraid0: 256 targets
root on sd0a (47b826b0a2f6888c.a) swap on sd0b dump on sd0b
WARNING: CHECK AND RESET THE DATE!
gpio0 at bcmgpio0: 58 pins
bwfm0: address dc:a6:XXX
ure0 at uhub0 port 2 configuration 1 interface 0 "Realtek USB 10/100/1000 LAN"
rev 3.20/31.fd addr 3
ure0: RTL8153B (0x6010), address 00:e0:XXX
rgephy0 at ure0 phy 0: RTL8251, rev. 0
rgephy0 detached
ure0 detached
OUTPUT FROM SERIAL CONSOLE:
rpgw# ifconfig -a
lo0: flags=2008049<UP,LOOPBACK,RUNNING,MULTICAST,LRO> mtu 32768
index 3 priority 0 llprio 3
groups: lo
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
inet 127.0.0.1 netmask 0xff000000
bse0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
lladdr dc:a6:XXX
index 1 priority 0 llprio 3
media: Ethernet autoselect (1000baseT full-duplex)
status: active
enc0: flags=0<>
index 2 priority 0 llprio 3
groups: enc
status: active
bwfm0: flags=808843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,AUTOCONF4> mtu 1500
lladdr dc:a6:XXX
index 4 priority 4 llprio 3
groups: wlan egress
YYY When the dongle is connected to the RPi, the output of ifconfig hangs here
for a couple of seconds.
YYY It seems to only begin to happen after the dongle has been connected for
some minutes.
media: IEEE802.11 autoselect (HT-MCS0 mode 11n)
status: active
ieee80211: nwid AAX chan 1 bssid be:24:XXX -31dBm wpakey wpaprotos wpa2
wpaakms psk wpaciphers ccmp wpagroupcipher ccmp
inet 192.168.54.39 netmask 0xffffff00 broadcast 192.168.54.255
pflog0: flags=141<UP,RUNNING,PROMISC> mtu 33136
index 5 priority 0 llprio 3
groups: pflog
rpgw# ping -I 192.168.54.39 10.216.134.165
PING 10.216.134.165 (10.216.134.165): 56 data bytes
64 bytes from 10.216.134.165: icmp_seq=0 ttl=64 time=6.433 ms
64 bytes from 10.216.134.165: icmp_seq=1 ttl=64 time=4.607 ms
64 bytes from 10.216.134.165: icmp_seq=2 ttl=64 time=10.747 ms
64 bytes from 10.216.134.165: icmp_seq=3 ttl=64 time=4.796 ms
64 bytes from 10.216.134.165: icmp_seq=4 ttl=64 time=3.263 ms
64 bytes from 10.216.134.165: icmp_seq=5 ttl=64 time=5.305 ms
64 bytes from 10.216.134.165: icmp_seq=6 ttl=64 time=4.995 ms
64 bytes from 10.216.134.165: icmp_seq=7 ttl=64 time=3.675 ms
ure0 at uhub0 port 2 configuration 1 interface 0 "Realtek USB 10/100/1000 LAN"
rev 3.20/31.fd addr 3
ure0: RTL8153B (0x6010), address 00:e0:XXX
rgephy0 at ure0 phy 0: RTL8251, rev. 0
YYY Ping output halts here until the dongle is removed from the RPi.
YYY Note the positions of the "rgephy0 detached" and the "ure0 detached".
YYY The block of pings from here until "ure0 detached" appear all at once.
64 bytes from 10.216.134.165: icmp_seq=8 ttl=64 time=1973rgephy0 detached
6.347 ms
64 bytes from 10.216.134.165: icmp_seq=9 ttl=64 time=18736.514 ms
64 bytes from 10.216.134.165: icmp_seq=10 ttl=64 time=17740.847 ms
64 bytes from 10.216.134.165: icmp_seq=11 ttl=64 time=16740.888 ms
64 bytes from 10.216.134.165: icmp_seq=12 ttl=64 time=15742.112 ms
64 bytes from 10.216.134.165: icmp_seq=13 ttl=64 time=14742.175 ms
64 bytes from 10.216.134.165: icmp_seq=14 ttl=64 time=13742.378 ms
64 bytes from 10.216.134.165: icmp_seq=15 ttl=64 time=12743.658 ms
64 bytes from 10.216.134.165: icmp_seq=16 ttl=64 time=11743.757 ms
64 bytes from 10.216.134.165: icmp_seq=17 ttl=64 time=10743.831 ms
64 bytes from 10.216.134.165: icmp_seq=18 ttl=64 time=9743.889 ms
64 bytes from 10.216.134.165: icmp_seq=19 ttl=64 time=8744.409 ms
64 bytes from 10.216.134.165: icmp_seq=20 ttl=64 time=7744.886 ms
64 bytes from 10.216.134.165: icmp_seq=21 ttl=64 time=6744.940 ms
64 bytes from 10.216.134.165: icmp_seq=22 ttl=64 time=5745.028 ms
64 bytes from 10.216.134.165: icmp_seq=23 ttl=64 time=4745.055 ms
64 bytes from 10.216.134.165: icmp_seq=24 ttl=64 time=3745.875 ms
64 bytes from 10.216.134.165: icmp_seq=25 ttl=64 time=2747.003 ms
64 bytes from 10.216.134.165: icmp_seq=26 ttl=64 time=1747.584 ms
64 bytes from 10.216.134ure0 detached
.165: icmp_seq=27 ttl=64 time=747.614 ms
64 bytes from 10.216.134.165: icmp_seq=28 ttl=64 time=4.681 ms
64 bytes from 10.216.134.165: icmp_seq=29 ttl=64 time=3.331 ms
64 bytes from 10.216.134.165: icmp_seq=30 ttl=64 time=5.166 ms
64 bytes from 10.216.134.165: icmp_seq=31 ttl=64 time=4.644 ms
^C
--- 10.216.134.165 ping statistics ---
32 packets transmitted, 32 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 3.263/6404.076/19736.347/6732.681 ms
rpgw#
YYY This is what the ure0 interface looks like.
ure0 at uhub0 port 2 configuration 1 interface 0 "Realtek USB 10/100/1000 LAN"
rev 3.20/31.fd addr 3
ure0: RTL8153B (0x6010), address 00:e0:XXX
rgephy0 at ure0 phy 0: RTL8251, rev. 0
rpgw# ifconfig ure0
ure0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
lladdr 00:e0:XXX
index 7 priority 0 llprio 3
media: Ethernet autoselect (none)
status: no carrier
rpgw# rgephy0 detached
ure0 detached
rpgw# ifconfig bse0 192.168.0.1 255.255.255.0
rpgw# ifconfig bse0
bse0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
lladdr dc:a6:XXX
index 1 priority 0 llprio 3
media: Ethernet autoselect (1000baseT full-duplex,master)
status: active
inet 192.168.0.1 netmask 0xffffff00 broadcast 192.168.0.255
rpgw# ifconfig ure0
ure0: no such interface
rpgw# ping 192.168.0.2
PING 192.168.0.2 (192.168.0.2): 56 data bytes
64 bytes from 192.168.0.2: icmp_seq=0 ttl=64 time=0.654 ms
64 bytes from 192.168.0.2: icmp_seq=1 ttl=64 time=0.478 ms
64 bytes from 192.168.0.2: icmp_seq=2 ttl=64 time=0.610 ms
64 bytes from 192.168.0.2: icmp_seq=3 ttl=64 time=0.587 ms
64 bytes from 192.168.0.2: icmp_seq=4 ttl=64 time=0.541 ms
64 bytes from 192.168.0.2: icmp_seq=5 ttl=64 time=0.634 ms
ure0 at uhub0 port 2 configuration 1 interface 0 "Realtek USB 10/100/1000 LAN"
rev 3.20/31.fd addr 3
ure0: RTL8153B (0x6010), address 00:e0:XXX
rgephy0 at ure0 phy 0: RTL8251, rev. 0
YYY The on-board Ethernet controller is unaffected.
64 bytes from 192.168.0.2: icmp_seq=6 ttl=64 time=0.305 ms
64 bytes from 192.168.0.2: icmp_seq=7 ttl=64 time=0.621 ms
64 bytes from 192.168.0.2: icmp_seq=8 ttl=64 time=0.401 ms
64 bytes from 192.168.0.2: icmp_seq=9 ttl=64 time=0.271 ms
64 bytes from 192.168.0.2: icmp_seq=10 ttl=64 time=0.634 ms
^C
--- 192.168.0.2 ping statistics ---
11 packets transmitted, 11 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 0.271/0.521/0.654/0.132 ms
rpgw#
rpgw# usbdevs -vvv
Controller /dev/usb0:
addr 01: 1106:0000 VIA, xHCI root hub
super speed, self powered, config 1, rev 1.00
driver: uhub0
port 01: 0000.0503 connect enabled recovery
port 02: 0000.0203 connect enabled power U0
port 03: 0001.02b0 power Rx.detect
port 04: 0001.02b0 power Rx.detect
port 05: 0001.02b0 power Rx.detect
addr 02: 2109:3431 VIA Labs, USB2.0 Hub
high speed, self powered, config 1, rev 4.21
driver: uhub1
port 01: 0011.0100 power
port 02: 0000.0100 power
port 03: 0000.0100 power
port 04: 0000.0100 power
addr 03: 0bda:8153 Realtek, USB 10/100/1000 LAN
super speed, power 46 mA, config 1, rev 31.fd, iSerial DF1300XXX
driver: ure0
rpgw# pcidump -v
Domain /dev/pci0:
0:0:0: Broadcom BCM2711
0x0000: Vendor ID: 14e4, Product ID: 2711
0x0004: Command: 0006, Status: 0010
0x0008: Class: 06 Bridge, Subclass: 04 PCI,
Interface: 00, Revision: 10
0x000c: BIST: 00, Header Type: 01, Latency Timer: 00,
Cache Line Size: 00
0x0010: BAR empty (00000000)
0x0014: BAR empty (00000000)
0x0018: Primary Bus: 0, Secondary Bus: 1, Subordinate Bus: 1,
Secondary Latency Timer: 00
0x001c: I/O Base: 00, I/O Limit: 00, Secondary Status: 0000
I/O Window: 0x00000000-0x00000fff
0x0020: Memory Base: c200, Memory Limit: c3f0
Memory Window: 0xc2000000-0xc3ffffff
0x0024: Prefetch Memory Base: fff1, Prefetch Memory Limit: 0001
0x0028: Prefetch Memory Base Upper 32 Bits: 00000000
0x002c: Prefetch Memory Limit Upper 32 Bits: 00000000
0x0030: I/O Base Upper 16 Bits: 0000, I/O Limit Upper 16 Bits: 0000
0x0038: Expansion ROM Base Address: 00000000
0x003c: Interrupt Pin: 01, Line: 00, Bridge Control: 0000
0x0048: Capability 0x01: Power Management
State: D0
0x00ac: Capability 0x10: PCI Express
Max Payload Size: 128 / 512 bytes
Max Read Request Size: 512 bytes
Link Speed: 5.0 / 5.0 GT/s
Link Width: x1 / x1
0x0100: Enhanced Capability 0x01: Advanced Error Reporting
0x0180: Enhanced Capability 0x0b: Vendor-Specific
0x0240: Enhanced Capability 0x1e: L1 PM
1:0:0: VIA VL805 xHCI
0x0000: Vendor ID: 1106, Product ID: 3483
0x0004: Command: 0006, Status: 0010
0x0008: Class: 0c Serial Bus, Subclass: 03 USB,
Interface: 30, Revision: 01
0x000c: BIST: 00, Header Type: 00, Latency Timer: 00,
Cache Line Size: 00
0x0010: BAR mem 64bit addr: 0x00000000c2000000/0x00001000
0x0018: BAR empty (00000000)
0x001c: BAR empty (00000000)
0x0020: BAR empty (00000000)
0x0024: BAR empty (00000000)
0x0028: Cardbus CIS: 00000000
0x002c: Subsystem Vendor ID: 1106 Product ID: 3483
0x0030: Expansion ROM Base Address: 00000000
0x0038: 00000000
0x003c: Interrupt Pin: 01 Line: 00 Min Gnt: 00 Max Lat: 00
0x0080: Capability 0x01: Power Management
State: D0
0x0090: Capability 0x05: Message Signalled Interrupts (MSI)
Enabled: no; 4 vectors (1 enabled)
0x00c4: Capability 0x10: PCI Express
Max Payload Size: 128 / 256 bytes
Max Read Request Size: 512 bytes
Link Speed: 5.0 / 5.0 GT/s
Link Width: x1 / x1
ASPM: L0s, L1 (L0s, L1 enabled)
0x0100: Enhanced Capability 0x01: Advanced Error Reporting
