Kernel dump while execute "ifconfig vlan destroy" command. Repeates at i386, amd64.
vmcore: http://acs-group.net.ua/vmcore.0
kernel config: http://acs-group.net.ua/chip

test# kgdb /boot/kernel/kernel vmcore.0
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Unread portion of the kernel message buffer:


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x0
fault code              = supervisor read, page not present
instruction pointer     = 0x20:0xc0690f30
stack pointer           = 0x28:0xd826bac0
frame pointer           = 0x28:0xd826bb28
code segment            = base rx0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
			processor eflags        = interrupt enabled, resume, IOPL = 0
			current process         = 970 (ifconfig)
			trap number             = 12
			panic: page fault
			cpuid = 0
			Uptime: 4m27s
			Physical memory: 435 MB
			Dumping 39 MB: 24 8
			
			Reading symbols from /boot/kernel/mpt.ko...Reading symbols from /boot/kernel/mpt
			.ko.symbols...done.
			done.
			Loaded symbols for /boot/kernel/mpt.ko
			Reading symbols from /boot/kernel/acpi.ko...Reading symbols from /boot/kernel/ac
			pi.ko.symbols...done.
			done.
			Loaded symbols for /boot/kernel/acpi.ko
			#0  doadump () at pcpu.h:196
			196     pcpu.h: No such file or directory.
			        in pcpu.h
			(kgdb) bt
			#0  doadump () at pcpu.h:196
			#1  0xc05e9601 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:418
#2  0xc05e9902 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:574
#3  0xc08744b3 in trap_fatal (frame=0xd826ba80, eva=0)
    at /usr/src/sys/i386/i386/trap.c:939
#4  0xc0874710 in trap_pfault (frame=0xd826ba80, usermode=0, eva=0)
    at /usr/src/sys/i386/i386/trap.c:852
#5  0xc08750d6 in trap (frame=0xd826ba80) at /usr/src/sys/i386/i386/trap.c:530
#6  0xc085b28b in calltrap () at /usr/src/sys/i386/i386/exception.s:159
#7  0xc0690f30 in vlan_unconfig_locked (ifp=0xc3a0ac00)
    at /usr/src/sys/net/if_vlan.c:1095
#8  0xc06913a7 in vlan_unconfig (ifp=0xc3a0ac00)
    at /usr/src/sys/net/if_vlan.c:1078
#9  0xc0691426 in vlan_clone_destroy (ifc=0xc0914d00, ifp=0xc3a0ac00)
    at /usr/src/sys/net/if_vlan.c:762
#10 0xc068dddc in if_clone_destroyif (ifc=0xc0914d00, ifp=0xc3a0ac00)
    at /usr/src/sys/net/if_clone.c:218
#11 0xc068e37f in if_clone_destroy (name=0xc3a2bac0 "vlan554")
    at /usr/src/sys/net/if_clone.c:196
#12 0xc068d18b in ifioctl (so=0xc3c58680, cmd=2149607801,
    data=0xc3a2bac0 "vlan554", td=0xc3ef28c0) at /usr/src/sys/net/if.c:1932
#13 0xc06294aa in soo_ioctl (fp=0xc3e4b04c, cmd=2149607801, data=0xc3a2bac0,
    active_cred=0xc3ea7400, td=0xc3ef28c0)
    at /usr/src/sys/kern/sys_socket.c:191
#14 0xc06222f5 in kern_ioctl (td=0xc3ef28c0, fd=3, com=2149607801,
    data=0xc3a2bac0 "vlan554") at file.h:268
#15 0xc0622454 in ioctl (td=0xc3ef28c0, uap=0xd826bcfc)
    at /usr/src/sys/kern/sys_generic.c:570
#16 0xc0874a49 in syscall (frame=0xd826bd38)
    at /usr/src/sys/i386/i386/trap.c:1090
#17 0xc085b2f0 in Xint0x80_syscall ()
    at /usr/src/sys/i386/i386/exception.s:255
#18 0x00000033 in ?? ()
Previous frame inner to this frame (corrupt stack?)

How-To-Repeat: # grep vlan554 /etc/rc.conf
ifconfig_vlan554="vlan554 vlandev le0 192.168.88.2 netmask 255.255.255.0"

Script:

#!/bin/sh

i=0

while [ $i -le 100 ] ; do
    echo $i
    i=$(($i+1))
    ifconfig vlan555 create 
    ifconfig vlan555 vlan 555 vlandev le0
    ifconfig vlan555 192.168.182.3/24
    ifconfig vlan554 create
    j=0
    while [ $j -le 100 ] ; do
	j=$(($j+1))
    done
    ifconfig vlan555 destroy
    ifconfig vlan554 destroy

done