crash on lagg interface destroy

Hello everyone,

I tried to destroy a lagg interface (created using laggproto none) and I see 
the system crash.

Steps to reproduce:
Kldload if_lagg
Ifconfig lagg0 create
ifconfig lagg0 up laggproto none laggport ql0 laggport ql1 192.168.100.1 
netmask 255.255.255.0
ifconfig lagg0 destroy

uname -a
FreeBSD bsd-02 7.4-RELEASE FreeBSD 7.4-RELEASE #0: Wed Mar  7 18:16:06 PST 2012 
    [EMAIL PROTECTED]:/usr/src/sys/amd64/compile/MYKERNEL  amd64

Crash:

Tracing command ifconfig pid 1443 tid 100182 td 0xffffff0023358740
Uart_z8530_class() at 0
Ifc_simple_destroy() at Ifc_simple_destroy+0x2a
If_clone_destroyif() at If_clone_destroyif+0xa5
Ifioctl() at ifioctl+0x300
Kern_ioctl() at kern_ioctl+0xa2
Ioctl() at ioctl+0xf9
Syscall() at syscall+0x252
Xfast_syscall() at Xfast_syscall+0xab
--- syscall (54, FreeBSD ELF64, ioctl), rip = 0x8008324bc, rsp = 
0x7fffffffe348, rbp = 0x7ffffffffee27 ---

Hope it helps. Let me know if you need more info.

Adarsh


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