A 9-STABLE desktop running amd64 steadfastly refuses to run usbdump(8):
# usbdump -i usbus0 -v -w /tmp/usb.log
read: Device not configured
0 packets captured
0 packets received by filter
0 packets dropped by kernel
It turns out that having hw.usb.no_pf="1" set in /boot/loader.conf to
speed up booting disables usbdump. Interestingly, this sysctl can be
changed at runtime, but usbdump will still not work. The value has to
be set in /boot/loader.conf at boot for usbdump to work again.
If usbdump could produce a warning when this sysctl is was set to 1 at
boot, it would make the mysterious error less mysterious.
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