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usbopen page fault
-current kernel (from a few hours ago) crashes in usbopen with page
fault trap when starting pcscd daemon (which I guess uses /dev/ugen
Faulting instruction is at usbopen+0x53 (amd64), and the instruction
is cmpb $0x1, 0x30(%rax). show registers in ddb shows rax is 0.
Possibly a mistake was made in some softc/device_t split?
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