panic: bad pte

Hello,
here is a bt full from
FreeBSD 5.2-CURRENT #0: Sun Jan  4 18:52:43 MSK 2004

----------------------------------------------------------------
panic: bad pte
panic messages:
---
panic: bad pte

syncing disks, buffers remaining... kernel trap 12 with interrupts disabled


Fatal trap 12: page fault while in kernel mode
fault virtual address	= 0x24
fault code		= supervisor read, page not present
instruction pointer	= 0x8:0xc04cc25e
stack pointer	        = 0x10:0xcd92bc80
frame pointer	        = 0x10:0xcd92bca0
code segment		= base 0x0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, def32 1, gran 1
processor eflags	= resume, IOPL = 0
current process		= 21 (irq10: pcic0 pcic1*)
trap number		= 12
panic: page fault
Uptime: 24m11s
Dumping 255 MB
 16 32 48 64 80 96 112 128 144 160 176 192 208 224 240
---
#0  doadump () at ../../../kern/kern_shutdown.c:240
240		dumping++;
#0  doadump () at ../../../kern/kern_shutdown.c:240
No locals.
#1  0xc04a4219 in boot (howto=260) at ../../../kern/kern_shutdown.c:372
No locals.
#2  0xc04a45f8 in panic () at ../../../kern/kern_shutdown.c:550
	td = (struct thread *) 0xc1100bd0
	bootopt = 260
	newpanic = 0
	ap = 0xcd92bbc4 "+╗`ю_at_╪\222м\001"
	buf = "bad pte", '\0' <repeats 248 times>
#3  0xc05d2ff6 in trap_fatal (frame=0xcd92bc40, eva=0) at ../../../i386/i386/trap.c:821
	code = 16
	type = 12
	ss = 16
	esp = 0
	softseg = {ssd_base = 0, ssd_limit = 1048575, ssd_type = 27, ssd_dpl = 0, 
  ssd_p = 1, ssd_xx = 0, ssd_xx1 = 0, ssd_def32 = 1, ssd_gran = 1}
#4  0xc05d2613 in trap (frame=
      {tf_fs = 24, tf_es = -846069744, tf_ds = -846069744, tf_edi = 0, tf_esi = -1067181592, tf_ebp = -846021472, tf_isp = -846021524, tf_ebx = -1030513040, tf_edx = -1055913008, tf_ecx = -1055913008, tf_eax = 4, tf_trapno = 12, tf_err = 0, tf_eip = -1068711330, tf_cs = 8, tf_eflags = 65683, tf_esp = -1032593236, tf_ss = 2}) at ../../../i386/i386/trap.c:250
	td = (struct thread *) 0xc1100bd0
	p = (struct proc *) 0xc273e000
	sticks = 3448945728
	i = 0
	ucode = 0
	type = 12
	code = 0
	eva = 36
#5  0xc05c3b28 in calltrap () at {standard input}:94
No locals.
#6  0xc04ccae4 in turnstile_wait (ts=0x0, lock=0xc063dfc0, owner=0x0)
    at ../../../kern/subr_turnstile.c:510
	tc = (struct turnstile_chain *) 0xc0641998
	td = (struct thread *) 0xc06419e8
	td1 = (struct thread *) 0xc2939e70
#7  0xc0499885 in _mtx_lock_sleep (m=0xc063dfc0, opts=0, file=0x0, line=0)
    at ../../../kern/kern_mutex.c:476
	ts = (struct turnstile *) 0x0
	td = (struct thread *) 0xc1100bd0
	v = 0
#8  0xc048e234 in ithread_loop (arg=0xc10fc900) at ../../../kern/kern_intr.c:543
	ithd = (struct ithd *) 0xc10fc900
	ih = (struct intrhand *) 0xc2795b40
	td = (struct thread *) 0xc1100bd0
	p = (struct proc *) 0xc273e000
#9  0xc048cec0 in fork_exit (callout=0xc048e070 <ithread_loop>, arg=0x0, frame=0x0)
    at ../../../kern/kern_fork.c:796
	p = (struct proc *) 0xc273e000
	td = (struct thread *) 0x0
----------------------------------------------------------------
-- 

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