FreeBSD 6.0/AMD64 server crash

[Wojciech Puchar]

Sleeping thread (tid 100168, pid 56693) owns a non-sleepable lock
panic: sleeping thread
Uptime: 23h56m57s
Sleeping thread (tid 100168, pid 56693) owns a non-sleepable lock
panic: sleeping thread
Uptime: 23h56m57s
kernel trap 12 with interrupts disabled


Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x48
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0xffffffff8025217e
stack pointer           = 0x10:0xffffffffae3e39a0
frame pointer           = 0x10:0xffffff0002ac5000
code segment            = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = resume, IOPL = 0
current process         = 14 (swi1: net)
trap number             = 12
panic: page fault
Uptime: 23h56m57s
GEOM_MIRROR: Device swap: provider mirror/swap destroyed.


any idea why? second crash like this and i have no idea why?

help please

 						Wojtek