ad4 detached

subj.
I update source and build kernel ~3 hour ago.
All OK
I again update source (I not remember, but changes 2-3 files) and 
rebuild kernel
When starting network, very speed reboot.
I see only 'ad4 detached'
in loader - unload kernel and load kernel.old - boot OK...
========
acer$ dmesg
Copyright (c) 1992-2008 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
         The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 8.0-CURRENT #0: Tue Sep  9 19:17:18 MSD 2008
 
lissyara_at_acer.lissyara.int.otradno.ru:/tmp/obj/usr/src/sys/main-color-console
link_elf_obj: Weak symbols not supported
link_elf_obj: symbol uart_quicc_class undefined
KLD file uart.ko - could not finalize loading
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: AMD Turion(tm) 64 X2 Mobile Technology TL-50 (1596.01-MHz K8-class CPU)
   Origin = "AuthenticAMD"  Id = 0x40f82  Stepping = 2
 
Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,HTT>
   Features2=0x2001<SSE3,CX16>
   AMD Features=0xea500800<SYSCALL,NX,MMX+,FFXSR,RDTSCP,LM,3DNow!+,3DNow!>
   AMD Features2=0x1f<LAHF,CMP,SVM,ExtAPIC,CR8>
   Cores per package: 2
usable memory = 1564684288 (1492 MB)
avail memory  = 1511059456 (1441 MB)
ACPI APIC Table: <PTLTD          APIC  >
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
  cpu0 (BSP): APIC ID:  0
  cpu1 (AP): APIC ID:  1
MADT: Forcing active-low polarity and level trigger for SCI
ioapic0 <Version 2.1> irqs 0-23 on motherboard
wlan: mac acl policy registered
ath_hal: 0.10.5.10 (AR5210, AR5211, AR5212, AR5416, RF5111, RF5112, 
RF2413, RF5413, RF2133, RF2425, RF2417)
acpi0: <ACRSYS ACRPRDCT> on motherboard
acpi0: [ITHREAD]
acpi0: Power Button (fixed)
acpi0: reservation of 0, 1000 (3) failed
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <32-bit timer at 3.579545MHz> port 0x8008-0x800b on acpi0
acpi_ec0: <Embedded Controller: GPE 0x10> port 0x62,0x66 on acpi0
acpi_lid0: <Control Method Lid Switch> on acpi0
acpi_button0: <Power Button> on acpi0
acpi_button1: <Sleep Button> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib1: <ACPI PCI-PCI bridge> at device 1.0 on pci0
pci1: <ACPI PCI bus> on pcib1
vgapci0: <VGA-compatible display> port 0x9000-0x90ff mem 
0xd4000000-0xd7ffffff,0xd0100000-0xd010ffff irq 17 at device 5.0 on pci1
acpi_video0: <ACPI video extension> on vgapci0
pcib2: <ACPI PCI-PCI bridge> at device 4.0 on pci0
pci2: <ACPI PCI bus> on pcib2
pcib3: <ACPI PCI-PCI bridge> at device 5.0 on pci0
pci4: <ACPI PCI bus> on pcib3
atapci0: <ATI IXP400 SATA150 controller> port 
0x8440-0x8447,0x8434-0x8437,0x8438-0x843f,0x8430-0x8433,0x8400-0x840f 
mem 0xd0004000-0xd00041ff irq 22 at device 18.0 on pci0
atapci0: [ITHREAD]
ata2: <ATA channel 0> on atapci0
ata2: [ITHREAD]
ata3: <ATA channel 1> on atapci0
ata3: [ITHREAD]
ohci0: <ATI SB400 USB Controller> mem 0xd0005000-0xd0005fff irq 19 at 
device 19.0 on pci0
ohci0: [GIANT-LOCKED]
ohci0: [ITHREAD]
usb0: OHCI version 1.0, legacy support
usb0: <ATI SB400 USB Controller> on ohci0
usb0: USB revision 1.0
uhub0: <ATI OHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb0
uhub0: 4 ports with 4 removable, self powered
ohci1: <ATI SB400 USB Controller> mem 0xd0006000-0xd0006fff irq 19 at 
device 19.1 on pci0
ohci1: [GIANT-LOCKED]
ohci1: [ITHREAD]
usb1: OHCI version 1.0, legacy support
usb1: <ATI SB400 USB Controller> on ohci1
usb1: USB revision 1.0
uhub1: <ATI OHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb1
uhub1: 4 ports with 4 removable, self powered
ehci0: <ATI SB400 USB 2.0 controller> mem 0xd0007000-0xd0007fff irq 19 
at device 19.2 on pci0
ehci0: [GIANT-LOCKED]
ehci0: [ITHREAD]
usb2: EHCI version 1.0
usb2: companion controllers, 4 ports each: usb0 usb1
usb2: <ATI SB400 USB 2.0 controller> on ehci0
usb2: USB revision 2.0
uhub2: <ATI EHCI root hub, class 9/0, rev 2.00/1.00, addr 1> on usb2
uhub2: 8 ports with 8 removable, self powered
ichsmb0: <SMBus controller> port 0x8410-0x841f at device 20.0 on pci0
ichsmb0: can't map I/O
device_attach: ichsmb0 attach returned 6
atapci1: <ATI IXP400 UDMA133 controller> port 
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0x8420-0x842f at device 20.1 on pci0
ata0: <ATA channel 0> on atapci1
ata0: [ITHREAD]
ata1: <ATA channel 1> on atapci1
ata1: [ITHREAD]
pcm0: <ATI SB450 High Definition Audio Controller> mem 
0xd0000000-0xd0003fff irq 16 at device 20.2 on pci0
pcm0: [ITHREAD]
isab0: <PCI-ISA bridge> at device 20.3 on pci0
isa0: <ISA bus> on isab0
pcib4: <ACPI PCI-PCI bridge> at device 20.4 on pci0
pci6: <ACPI PCI bus> on pcib4
rl0: <RealTek 8139 10/100BaseTX> port 0xa000-0xa0ff mem 
0xd0210000-0xd02100ff irq 21 at device 1.0 on pci6
miibus0: <MII bus> on rl0
rlphy0: <RealTek internal media interface> PHY 0 on miibus0
rlphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
rl0: Ethernet address: 00:16:d4:b1:a2:a8
rl0: [ITHREAD]
ath0: <Atheros 2413> mem 0xd0200000-0xd020ffff irq 22 at device 2.0 on pci6
ath0: [ITHREAD]
ath0: WARNING: using obsoleted if_watchdog interface
ath0: mac 7.8 phy 4.5 radio 5.6
cbb0: <PCI-CardBus Bridge> mem 0xd0211000-0xd0211fff irq 20 at device 
4.0 on pci6
cardbus0: <CardBus bus> on cbb0
pccard0: <16-bit PCCard bus> on cbb0
cbb0: [ITHREAD]
pci6: <memory, flash> at device 4.1 (no driver attached)
pci6: <base peripheral> at device 4.2 (no driver attached)
pci6: <memory, flash> at device 4.3 (no driver attached)
pci6: <memory, flash> at device 4.4 (no driver attached)
acpi_tz0: <Thermal Zone> on acpi0
atrtc0: <AT realtime clock> port 0x70-0x71 irq 8 on acpi0
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
atkbd0: [ITHREAD]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
psm0: [ITHREAD]
psm0: model Generic PS/2 mouse, device ID 0
battery0: <ACPI Control Method Battery> on acpi0
acpi_acad0: <AC Adapter> on acpi0
cpu0: <ACPI CPU> on acpi0
powernow0: <PowerNow! K8> on cpu0
cpu1: <ACPI CPU> on acpi0
powernow1: <PowerNow! K8> on cpu1
orm0: <ISA Option ROMs> at iomem 0xc0000-0xcefff,0xcf000-0xcffff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
ums0: <Logitech Optical USB Mouse, class 0/0, rev 2.00/3.40, addr 2> on 
uhub0
ums0: 3 buttons and Z dir.
Timecounters tick every 1.000 msec
acd0: DVDR <MATSHITADVD-RAM UJ-850S/1.20> at ata0-master UDMA33
ad4: 76319MB <Hitachi HTS541680J9SA00 SB2OC70P> at ata2-master SATA150
pcm0: <HDA Codec: Realtek ALC883>
pcm0: <HDA Driver Revision: 20080420_0052>
SMP: AP CPU #1 Launched!
Trying to mount root from ufs:/dev/ad4s1a
acd0: FAILURE - INQUIRY ILLEGAL REQUEST asc=0x24 ascq=0x00
cd0 at ata0 bus 0 target 0 lun 0
cd0: <MATSHITA DVD-RAM UJ-850S 1.20> Removable CD-ROM SCSI-0 device
cd0: 33.000MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not present
WARNING: TMPFS is considered to be a highly experimental feature in FreeBSD.
wlan0: Ethernet address: 00:19:7d:7b:72:82
ipfw2 initialized, divert loadable, nat loadable, rule-based forwarding 
disabled, default to deny, logging disabled
link_elf_obj: symbol dev2unit undefined
kldload: /usr/local/modules/fuse.ko: Unsupported file type
kbd1 at kbdmux0
drm0: <ATI Radeon RS485 XPRESS 1100 IGP> on vgapci0
vgapci0: child drm0 requested pci_enable_busmaster
info: [drm] Initialized radeon 1.29.0 20080613
info: [drm] Setting GART location based on new memory map
info: [drm] Loading R300 Microcode
info: [drm] Num pipes: 2
info: [drm] writeback test succeeded in 1 usecs
drm0: [ITHREAD]
acer$