general protection fault in in_ifadown

Hi

Fatal trap 9: general protection fault while in kernel mode
instruction pointer     = 0x8:0xffffffff8056679f
stack pointer           = 0x10:0xffffffffb4c2a950
frame pointer           = 0x10:0xffffffffb4c2a9a0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 11612 (ifconfig)
trap number             = 9
panic: general protection fault
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
panic() at panic+0x17e
trap_fatal() at trap_fatal+0x26f
trap() at trap+0x21a
calltrap() at calltrap+0x8
--- trap 0x9, rip = 0xffffffff8056679f, rsp = 0xffffffffb4c2a950, rbp
= 0xffffffffb4c2a9a0 ---
in_ifadown() at in_ifadown+0x1f
in_control() at in_control+0x7f0
ifioctl() at ifioctl+0xea
kern_ioctl() at kern_ioctl+0xa3
ioctl() at ioctl+0xf9
syscall() at syscall+0x1ce
Xfast_syscall() at Xfast_syscall+0xab
--- syscall (54, FreeBSD ELF64, ioctl), rip = 0x6a2fac, rsp =
0x7fffffffe348, rbp = 0x7fffffffedc1 ---

FreeBSD 7.0-PRERELEASE #0: Mon Jan  7 19:20:49 EET 2008
Could this be fixed since then?
Happened when playing with dhclient, maybe there were more instances
of it than there should be :) Just before the crash it said:
Corrupt lease file - possible data loss!

kgdb:
(kgdb) bt
#0  doadump () at pcpu.h:194
#1  0xffffffff8048b220 in boot (howto=260) at
/usr/src/sys/kern/kern_shutdown.c:409
#2  0xffffffff8048b5f1 in panic (fmt=0x1 <Address 0x1 out of bounds>)
at /usr/src/sys/kern/kern_shutdown.c:563
#3  0xffffffff807878af in trap_fatal (frame=0x9, eva=Variable "eva" is
not available.
) at /usr/src/sys/amd64/amd64/trap.c:724
#4  0xffffffff807884da in trap (frame=0xffffffffb4c2a8a0) at
/usr/src/sys/amd64/amd64/trap.c:526
#5  0xffffffff80770ffe in calltrap () at
/usr/src/sys/amd64/amd64/exception.S:169
#6  0xffffffff8056679f in in_ifadown (ifa=0xffffff003bf5a600,
delete=1) at /usr/src/sys/netinet/in_rmx.c:389
#7  0xffffffff805604f0 in in_control (so=Variable "so" is not available.
) at /usr/src/sys/netinet/in.c:474
#8  0xffffffff8051db2a in ifioctl (so=0xffffff002b085000,
cmd=2149607705, data=0xffffff000142b800 "volia",
td=0xffffff000d6149f0)
    at /usr/src/sys/net/if.c:1888
#9  0xffffffff804c48b3 in kern_ioctl (td=0xffffff000d6149f0, fd=3,
com=2149607705, data=0xffffff000142b800 "volia") at file.h:266
#10 0xffffffff804c4b19 in ioctl (td=0xffffff000d6149f0,
uap=0xffffffffb4c2abe0) at /usr/src/sys/kern/sys_generic.c:570
#11 0xffffffff80787e0e in syscall (frame=0xffffffffb4c2ac70) at
/usr/src/sys/amd64/amd64/trap.c:852
#12 0xffffffff8077120b in Xfast_syscall () at
/usr/src/sys/amd64/amd64/exception.S:290
#13 0x00000000006a2fac in ?? ()
Previous frame inner to this frame (corrupt stack?)

kernconf:
include GENERIC
options         INCLUDE_CONFIG_FILE     # Include this file in kernel
nooption        SMP                     # Symmetric MultiProcessor Kernel
nocpu           I486_CPU
nocpu           I586_CPU
nooption        SCHED_4BSD
options         SCHED_ULE
device          crypto                  # core crypto support
options         IPSEC                   # New IPsec (cannot define w/ IPSEC)
options         LIBALIAS                # Libalias library, performing NAT
options         IPFIREWALL              # ipfw
options         IPFIREWALL_VERBOSE      # enable logging to syslogd(8)
options         IPFIREWALL_FORWARD      # Packet destination changes
options         IPFIREWALL_NAT          # ipfw kernel NAT support
options         GEOM_JOURNAL            # Journaling
options         KDB                     # Compile with kernel debugger
related code.
options         DDB                     # Enable the ddb debugger backend.
options         KDB_TRACE               # Print a stack trace of the
current thread on the console for a panic.
options         ALT_BREAK_TO_DEBUGGER   # Break via "CR ~ ^b"
options         INVARIANTS              # Enable calls of extra sanity checking
options         INVARIANT_SUPPORT       # Extra sanity checks of
internal structures, required by INVARIANTS
options         WITNESS                 # Enable checks to detect
deadlocks and cycles
options         WITNESS_SKIPSPIN        # Don't run witness on
spinlocks for speed
nodevice        umass                   # Disks/Mass storage -
Requires scbus and da
device          ucom                    # USB serial support
device          uplcom                  # USB support for Prolific
PL-2303 serial adapters

-- 
With best regards, Gleb Kozyrev.