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kern/46290: urndis(4) drops to ddb if ifconfig'ed

>Number:         46290
>Category:       kern
>Synopsis:       urndis(4) drops to ddb if ifconfig'ed
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Apr 03 16:30:00 +0000 2012
>Originator:     fukumoto
>Release:        NetBSD 6.0_BETA
System: NetBSD kestrel 6.0_BETA NetBSD 6.0_BETA (GENERIC) amd64
Architecture: x86_64
Machine: amd64

        Formerly (circa 5.99.55), A Wi-MAX/Wi-Fi router NEC WR-3500R
        used to be attached as cdce(4) if connected with USB cable,
        but 6,0_BETA kernel attaches it as urndis(4), and if I do
        ifconfig, it drops to ddb.

$ sudo ifconfig urndis0
uvm_fault(0xfffffe81073e9a48, 0x0, 4) -> e
fatal page fault in supervisor mode
trap type 6 code 10 rip 0 cs 8 rflags 10202 cr2  0 cpl 6 rsp fffffe80015fa798
kernel: page fault trap, code=0
Stopped in pid 72.1 (ifconfig) at       0:      invalid address
db{2}> bt
?() at 0
ether_ioctl() at netbsd:ether_ioctl+0x133
urndis_ioctl() at netbsd:urndis_ioctl+0x57
in_ifinit() at netbsd:in_ifinit+0x128
in_control() at netbsd:in_control+0xb04
udp_usrreq_wrapper() at netbsd:udp_usrreq_wrapper+0x46
compat_ifioctl() at netbsd:compat_ifioctl+0xb5
ifioctl() at netbsd:ifioctl+0x493
soo_ioctl() at netbsd:soo_ioctl+0x31b
sys_ioctl() at netbsd:sys_ioctl+0x13c
syscall() at netbsd:syscall+0xc4



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