Fatal trap 30 when loading if_xl

Today's CURRENT panic my box everytime i load
if_xl:

[flag_at_newluxor NEWLUXOR]$ sudo kgdb kernel.debug /var/crash/vmcore.0
[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-marcel-freebsd".

Unread portion of the kernel message buffer:
<118>.
<118>.
<118>Aug 19 22:38:31 newluxor syslogd: exiting on signal 15
<118>Enter full pathname of shell or RETURN for /bin/sh:
<118>#
<118>/dev/ad4s1a on / (ufs, local)
<118>devfs on /dev (devfs, local)
<118>/dev/ad4s1d on /usr (ufs, local, soft-updates)
<118>/dev/ad4s5 on /storage (msdosfs, local)
<118>procfs on /proc (procfs, local)
<118>linprocfs on /usr/compat/linux/proc (linprocfs, local)
<118># 
<118># 
<118># 
<118>/dev/ad4s1a on / (ufs, local)
<118>devfs on /dev (devfs, local)
<118>/dev/ad4s1d on /usr (ufs, local, soft-updates)
<118>/dev/ad4s5 on /storage (msdosfs, local)
<118># 
<118># 
<118>/dev/ad4s1a on / (ufs, local)
<118>devfs on /dev (devfs, local)
<118>/dev/ad4s1d on /usr (ufs, local, soft-updates)
<118># 
<118># 
<118>umount:
<118>unmount of /dev failed
<118>: 
<118>Device busy
<118># 
<118>.cshrc             cdrom           home            media           storage
<118>.profile   compat          lib             mnt             sys
<118>.snap              dev             libexec         proc            tmp
<118>COPYRIGHT  dist            linc_data       rescue          usr
<118>bin                entropy         linc_storage    root            var
<118>boot               etc             lost+found      sbin
<118># 
xl0: <3Com 3c905B-TX Fast Etherlink XL> port 0xcc00-0xcc7f mem 0xff8ffc00-0xff8ffc7f irq 18 at device 2.0 on pci1

Fatal trap 30: reserved (unknown) fault while in kernel mode
cpuid = 0; apic id = 00
instruction pointer     = 0x20:0xc04ef25b
stack pointer           = 0x28:0xe3491c34
frame pointer           = 0x28:0xe3491c50
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, IOPL = 0
current process         = 12 (swi4: clock sio)
panic: from debugger
cpuid = 0
Uptime: 2m36s
Physical memory: 2031 MB
Dumping 61 MB: 46 30 14

#0  doadump () at pcpu.h:166
166             __asm __volatile("movl %%fs:0,%0" : "=r" (td));
(kgdb) bt            
#0  doadump () at pcpu.h:166
#1  0xc04f9cd4 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:409
#2  0xc04fa0b3 in panic (fmt=0xc06976c3 "from debugger")
    at /usr/src/sys/kern/kern_shutdown.c:565
#3  0xc0451b47 in db_panic (addr=-1068567973, have_addr=0, count=-1, 
    modif=0xe3491a1c "") at /usr/src/sys/ddb/db_command.c:428
#4  0xc0451ada in db_command (last_cmdp=0xc06ef7c4, cmd_table=0x0)
    at /usr/src/sys/ddb/db_command.c:396
#5  0xc0451ba1 in db_command_loop () at /usr/src/sys/ddb/db_command.c:448
#6  0xc0453ae9 in db_trap (type=30, code=0) at /usr/src/sys/ddb/db_main.c:221
#7  0xc051bcde in kdb_trap (type=0, code=0, tf=0xe3491bf4)
    at /usr/src/sys/kern/subr_kdb.c:502
#8  0xc066f602 in trap_fatal (frame=0xe3491bf4, eva=0)
    at /usr/src/sys/i386/i386/trap.c:858
#9  0xc066f04d in trap (frame=
      {tf_fs = -1066467320, tf_es = -481755096, tf_ds = 40, tf_edi = -997181328, tf_esi = -996104080, tf_ebp = -481747888, tf_isp = -481747936, tf_ebx = -1066453624, tf_edx = 4, tf_ecx = -996104080, tf_eax = 582, tf_trapno = 30, tf_err = 0, tf_eip = -1068567973, tf_cs = 32, tf_eflags = 582, tf_esp = -1066453624, tf_ss = -1066446508}) at /usr/src/sys/i386/i386/trap.c:658
#10 0xc065766a in calltrap () at /usr/src/sys/i386/i386/exception.s:138
#11 0xc04ef25b in _mtx_lock_sleep (m=0xc06f3588, tid=3297785968, opts=0, 
    file=0x0, line=0) at cpufunc.h:317
#12 0xc050c028 in softclock (dummy=0x0) at /usr/src/sys/kern/kern_timeout.c:240
#13 0xc04dfbbf in ithread_execute_handlers (p=0xc49028d0, ie=0xc4957180)
    at /usr/src/sys/kern/kern_intr.c:662
#14 0xc04dfd05 in ithread_loop (arg=0xc48c68f0)
    at /usr/src/sys/kern/kern_intr.c:745
#15 0xc04de558 in fork_exit (callout=0xc04dfca1 <ithread_loop>, arg=0x246, 
    frame=0x246) at /usr/src/sys/kern/kern_fork.c:818
#16 0xc06576cc in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:199
(kgdb) frame 12
#12 0xc050c028 in softclock (dummy=0x0) at /usr/src/sys/kern/kern_timeout.c:240
240                                             mtx_lock(c_mtx);
(kgdb) p c_mtx
$1 = (struct mtx *) 0xc06f3588
(kgdb) p *c_mtx
$2 = {mtx_object = {lo_name = 0xc06a1779 "Giant", 
    lo_type = 0xc06a1779 "Giant", lo_flags = 17498112, lo_witness_data = {
      lod_list = {stqe_next = 0x0}, lod_witness = 0x0}}, 
  mtx_lock = 3298863219, mtx_recurse = 1}
(kgdb) 

bye
-- 

Paolo

Piso's first law: nothing works as expected!