Hello!
I'm have FreeBSD-4.10-RC3.
Whem performing operations over the sound (hw.snd.pcm0.vchan=4) system 
was going down for reboot.
Copyright (c) 1992-2004 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 4.10-RC3 #0: Mon May 24 00:20:34 MSD 2004 
     root@:/usr/src/sys/compile/VIAPROG 
Timecounter "i8254"  frequency 1193182 Hz 
CPU: Intel(R) Pentium(R) 4 CPU 1.80GHz (1817.91-MHz 686-class CPU) 
   Origin = "GenuineIntel"  Id = 0xf24  Stepping = 4 
 
Features=0x3febfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUS
H,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM> 
real memory  = 268369920 (262080K bytes) 
avail memory = 257769472 (251728K bytes) 
Programming 24 pins in IOAPIC #0 
IOAPIC #0 intpin 2 -> irq 0 
FreeBSD/SMP: Multiprocessor motherboard: 1 CPUs 
  cpu0 (BSP): apic id:  0, version: 0x00050014, at 0xfee00000 
  io0 (APIC): apic id:  2, version: 0x00178020, at 0xfec00000 
Preloaded elf kernel "kernel" at 0xc0352000. 
Warning: Pentium 4 CPU: PSE disabled 
Pentium Pro MTRR support enabled 
md0: Malloc disk 
Using $PIR table, 9 entries at 0xc00fded0 
apm0: <APM BIOS> on motherboard 
apm0: found APM BIOS v1.2, connected at v1.2 
npx0: <math processor> on motherboard 
npx0: INT 16 interface 
pcib0: <Intel 82845 Host to PCI bridge> on motherboard 
IOAPIC #0 intpin 16 -> irq 2 
IOAPIC #0 intpin 19 -> irq 5 
IOAPIC #0 intpin 18 -> irq 9 
IOAPIC #0 intpin 23 -> irq 10 
IOAPIC #0 intpin 17 -> irq 11 
pci0: <PCI bus> on pcib0 
agp0: <Intel 82845 host to AGP bridge> mem 0xd0000000-0xd7ffffff at 
device 0.0 on pci0
pcib1: <Intel 82845 PCI-PCI (AGP) bridge> at device 1.0 on pci0 
pci1: <PCI bus> on pcib1 
pci1: <NVidia model 0171 graphics accelerator> at 0.0 irq 2 
pci0: <UHCI USB controller> at 29.0 irq 2 
pci0: <UHCI USB controller> at 29.1 irq 5 
pci0: <UHCI USB controller> at 29.2 irq 9 
pci0: <USB controller> at 29.7 irq 10 
pcib2: <Intel 82801BA/BAM (ICH2) Hub to PCI bridge> at device 30.0 on 
pci0
IOAPIC #0 intpin 21 -> irq 16 
IOAPIC #0 intpin 22 -> irq 17 
pci2: <PCI bus> on pcib2 
sio0: configured irq 9 not in bitmap of probed irqs 0x20 
sio0: <3COM PCI FaxModem> port 0x9000-0x9007 irq 9 at device 0.0 on pci2 
sio0: moving to sio2 
sio2: type 16550A 
rl0: <RealTek 8139 10/100BaseTX> port 0x9400-0x94ff mem 
0xeb004000-0xeb0040ff irq 16 at device 1.0 o
n pci2 
rl0: Ethernet address: 00:05:1c:18:5f:50 
miibus0: <MII bus> on rl0 
rlphy0: <RealTek internal media interface> on miibus0 
rlphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto 
atapci0: <Promise TX2 ATA133 controller> port 
0xa800-0xa80f,0xa400-0xa403,0xa000-0xa007,0x9c00-0x9c0
3,0x9800-0x9807 mem 0xeb000000-0xeb003fff irq 17 at device 2.0 on pci2 
ata2: at 0x9800 on atapci0 
ata3: at 0xa000 on atapci0 
isab0: <PCI to ISA bridge (vendor=8086 device=24c0)> at device 31.0 on 
pci0
isa0: <ISA bus> on isab0 
atapci1: <Intel ICH4 ATA100 controller> port 
0xcc00-0xcc0f,0xc800-0xc803,0xc400-0xc407,0xc000-0xc003
,0xbc00-0xbc07 irq 2 at device 31.1 on pci0 
ata0: at 0x1f0 irq 14 on atapci1 
ata1: at 0x170 irq 15 on atapci1 
pci0: <unknown card> (vendor=0x8086, dev=0x24c3) at 31.3 irq 11 
pcm0: <Intel ICH4 (82801DB)> port 0xd800-0xd83f,0xd400-0xd4ff mem 
0xec003000-0xec0030ff,0xec002000-0
xec0021ff irq 11 at device 31.5 on pci0 
pcm0: <Avance Logic ALC650 AC97 Codec> 
orm0: <Option ROM> at iomem 0xd0000-0xd27ff on isa0 
pmtimer0 on isa0 
fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on 
isa0
fdc0: FIFO enabled, 8 bytes threshold 
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0 
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0 
kbd0 at atkbd0 
psm0: <PS/2 Mouse> irq 12 on atkbdc0 
psm0: model IntelliMouse, device ID 3 
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on 
isa0
sc0: <System console> at flags 0x100 on isa0 
sc0: VGA <16 virtual consoles, flags=0x300> 
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0 
sio0: type 16550A 
sio1 at port 0x2f8-0x2ff irq 3 on isa0 
sio1: type 16550A 
ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0 
ppc0: Generic chipset (NIBBLE-only) in COMPATIBLE mode 
ppbus0: IEEE1284 device found /NIBBLE 
Probing for PnP devices on ppbus0: 
ppbus0: <Canon BJC-1000/1.30> PRINTER BJL,BJRaster,BSCC,TXT01 
plip0: <PLIP network interface> on ppbus0 
lpt0: <Printer> on ppbus0 
lpt0: Interrupt-driven port 
ppi0: <Parallel I/O> on ppbus0 
ad0: 114473MB <ST3120026A> [232581/16/63] at ata0-master UDMA100 
ad3: 4126MB <ST34313A> [8944/15/63] at ata1-slave UDMA66 
ad4: 190782MB <ST3200822A> [387621/16/63] at ata2-master UDMA100 
ad6: 38166MB <ST340810A> [77545/16/63] at ata3-master UDMA100 
acd0: CD-RW <RICOH CD-RW MP7400A R107 20020620> at ata1-master UDMA33 
Mounting root from ufs:/dev/ad0s1a 
WARNING: / was not properly dismounted 
nvidia0: <GeForce4 MX 440> mem 
0xe0000000-0xe007ffff,0xd8000000-0xdfffffff,0xe8000000-0xe8ffffff irq
  2 at device 0.0 on pci1 
-- 
Igor A. Valcov