I have a new Dell 8400 with 1G of RAM and a big SATA disk.  I brought 
up -current on it (from yesterday's source).  When I tried unpacking 
two tarballs at once (pkgsrc, from an on-disk file and src, from a CD),
something hung.  If I try to run 'find' on /usr/pkgsrc, the find 
command hangs, in a fashion unkillable by 'kill -9'.  ps shows that 
it's in vnlock.  

The kernel is GENERIC.MPACPI; here's the dmesg, if it matters.
---
NetBSD 2.99.12 (GENERIC.MPACPI) #0: Mon Jan  3 08:33:45 EST 2005
	smb@berkshire.machshav.com:/usr/BUILD/obj/sys/arch/i386/compile/GENERIC.MPACPI
total memory = 1022 MB
avail memory = 992 MB
BIOS32 rev. 0 found at 0xffe90
mainbus0 (root)
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel (686-class), 3391.68 MHz, id 0xf34
cpu0: features bfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu0: features bfebfbff<PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX>
cpu0: features bfebfbff<FXSR,SSE,SSE2,SS,HTT,TM,SBF>
cpu0: features2 441d<SSE3,MONITOR,DS-CPL,CID>
cpu0: "Intel(R) Pentium(R) 4 CPU 3.40GHz"
cpu0: I-cache 12K uOp cache 8-way
cpu0: L2 cache 1 MB 64B/line 8-way
cpu0: ITLB 4K/4M: 64 entries
cpu0: DTLB 4K/4M: 64 entries
cpu0: running without thermal monitor!
cpu0: calibrating local timer
cpu0: apic clock running at 199 MHz
cpu0: 32 page colors
cpu1 at mainbus0: apid 1 (application processor)
cpu1: starting
cpu1: Intel (686-class), 3391.51 MHz, id 0xf34
cpu1: features bfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu1: features bfebfbff<PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX>
cpu1: features bfebfbff<FXSR,SSE,SSE2,SS,HTT,TM,SBF>
cpu1: features2 441d<SSE3,MONITOR,DS-CPL,CID>
cpu1: "Intel(R) Pentium(R) 4 CPU 3.40GHz"
cpu1: I-cache 12K uOp cache 8-way
cpu1: L2 cache 1 MB 64B/line 8-way
cpu1: ITLB 4K/4M: 64 entries
cpu1: DTLB 4K/4M: 64 entries
cpu1: running without thermal monitor!
ioapic0 at mainbus0 apid 8 (I/O APIC)
ioapic0: pa 0xfec00000, version 20, 24 pins
ioapic0: misconfigured as apic 0
ioapic0: remapped to apic 8
acpi0 at mainbus0
acpi0: using Intel ACPI CA subsystem version 20040211
acpi0: X/RSDT: OemId <DELL  , 8400   ,00000007>, AslId <ASL ,00000061>
acpi0: SCI interrupting at int 9
acpi0: fixed-feature power button present
mpacpi: could not get bus number, assuming bus 0
ACPI Object Type 'Processor' (0x0c) at acpi0 not configured
ACPI Object Type 'Processor' (0x0c) at acpi0 not configured
acpibut0 at acpi0 (PNP0C0C): ACPI Power Button
PNP0A03 [PCI Bus] at acpi0 not configured
PNP0C01 [System Board] at acpi0 not configured
PNP0200 [AT DMA Controller] at acpi0 not configured
npx0 at acpi0 (PNP0C04)
npx0: io 0xf0-0xff irq 13
npx0: using exception 16
PNP0000 [AT Interrupt Controller] at acpi0 not configured
PNP0800 [AT-style speaker sound] at acpi0 not configured
PNP0B00 [AT Real-Time Clock] at acpi0 not configured
PNP0100 [AT Timer] at acpi0 not configured
fdc0 at acpi0 (PNP0700)
fdc0: io 0x3f0-0x3f5,0x3f7 irq 6 drq 2
pckbc0 at acpi0 (PNP0303): kbd port
pckbc0: io 0x60,0x64 irq 1
pckbc1 at acpi0 (PNP0F13): aux port
pckbc1: irq 12
lpt0 at acpi0 (PNP0401)
lpt0: io 0x378-0x37f,0x778-0x77f irq 7
com0 at acpi0 (PNP0501-1)
com0: io 0x3f8-0x3ff irq 4
com0: ns16550a, working fifo
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C01 [System Board] at acpi0 not configured
PNP0C02 [Plug and Play motherboard register resources] at acpi0 not configured
PNP0103 at acpi0 not configured
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard
pms0 at pckbc0 (aux slot)
pckbc0: using irq 12 for aux slot
wsmouse0 at pms0 mux 0
pci0 at mainbus0 bus 0: configuration mode 1
pci0: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
pchb0 at pci0 dev 0 function 0
pchb0: Intel 82925X Host (rev. 0x04)
ppb0 at pci0 dev 1 function 0: Intel 82925X PCI Express Bridge (rev. 0x04)
pci1 at ppb0 bus 1
pci1: i/o space, memory space enabled, rd/line, wr/inv ok
vga0 at pci1 dev 0 function 0: ATI Technologies Radeon X300 Series (rev. 0x00)
wsdisplay0 at vga0 kbdmux 1: console (80x25, vt100 emulation), using wskbd0
wsmux1: connecting to wsdisplay0
ATI Technologies Radeon X300 Series Secondary (miscellaneous display) at pci1 dev 0 function 1 not configured
ppb1 at pci0 dev 28 function 0: Intel 82801FB/FR PCI Express Port #0 (rev. 0x03)
pci2 at ppb1 bus 2
pci2: i/o space, memory space enabled, rd/line, wr/inv ok
bge0 at pci2 dev 0 function 0: Broadcom BCM5751 Gigabit Ethernet
bge0: interrupting at ioapic0 pin 16 (irq 11)
bge0: ASIC BCM5750 A1 (0x4001), Ethernet address 00:11:11:5b:25:63
brgphy0 at bge0 phy 1: BCM5750 1000BASE-T media interface, rev. 0
brgphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto
ppb2 at pci0 dev 28 function 1: Intel 82801FB/FR PCI Express Port #1 (rev. 0x03)
pci3 at ppb2 bus 3
pci3: i/o space, memory space enabled, rd/line, wr/inv ok
uhci0 at pci0 dev 29 function 0: Intel 82801FB/FR USB UHCI Controller (rev. 0x03)
uhci0: interrupting at ioapic0 pin 21 (irq 9)
usb0 at uhci0: USB revision 1.0
uhub0 at usb0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhci1 at pci0 dev 29 function 1: Intel 82801FB/FR USB UHCI Controller (rev. 0x03)
uhci1: interrupting at ioapic0 pin 22 (irq 5)
usb1 at uhci1: USB revision 1.0
uhub1 at usb1
uhub1: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
uhci2 at pci0 dev 29 function 2: Intel 82801FB/FR USB UHCI Controller (rev. 0x03)
uhci2: interrupting at ioapic0 pin 18 (irq 3)
usb2 at uhci2: USB revision 1.0
uhub2 at usb2
uhub2: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
uhci3 at pci0 dev 29 function 3: Intel 82801FB/FR USB UHCI Controller (rev. 0x03)
uhci3: interrupting at ioapic0 pin 23 (irq 10)
usb3 at uhci3: USB revision 1.0
uhub3 at usb3
uhub3: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub3: 2 ports with 2 removable, self powered
ehci0 at pci0 dev 29 function 7: Intel 82801FB/FR USB EHCI Controller (rev. 0x03)
ehci0: interrupting at ioapic0 pin 21 (irq 9)
ehci0: EHCI version 1.0
ehci0: companion controllers, 2 ports each: uhci0 uhci1 uhci2 uhci3
usb4 at ehci0: USB revision 2.0
uhub4 at usb4
uhub4: Intel EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub4: single transaction translator
uhub4: 8 ports with 8 removable, self powered
ppb3 at pci0 dev 30 function 0: Intel 82801BA Hub-PCI Bridge (rev. 0xd3)
pci4 at ppb3 bus 4
pci4: i/o space, memory space enabled
Intel product 0x1080 (modem communications, revision 0x04) at pci4 dev 2 function 0 not configured
auich0 at pci0 dev 30 function 2: i82801FB (ICH6) AC-97 Audio
auich0: interrupting at ioapic0 pin 23 (irq 10)
auich0: ac97: Analog Devices AD1980 codec; headphone, 20 bit DAC, no 3D stereo
auich0: ac97: ext id 3c3<AMAP,LDAC,SDAC,CDAC,DRA,VRA>
pcib0 at pci0 dev 31 function 0
pcib0: Intel 82801FB LPC Interface Bridge (rev. 0x03)
piixide0 at pci0 dev 31 function 1
piixide0: Intel 82801FB IDE Controller (ICH6) (rev. 0x03)
piixide0: bus-master DMA support present
piixide0: primary channel wired to compatibility mode
piixide0: primary channel interrupting at ioapic0 pin 14 (irq 14)
atabus0 at piixide0 channel 0
piixide0: secondary channel wired to compatibility mode
piixide0: secondary channel ignored (disabled)
piixide1 at pci0 dev 31 function 2
piixide1: Intel 82801FR Serial ATA/Raid Controller (rev. 0x03)
piixide1: bus-master DMA support present
piixide1: primary channel wired to native-PCI mode
piixide1: using ioapic0 pin 20 (irq 5) for native-PCI interrupt
atabus1 at piixide1 channel 0
piixide1: secondary channel wired to compatibility mode
piixide1: secondary channel interrupting at ioapic0 pin 15 (irq 15)
atabus2 at piixide1 channel 1
Intel 82801FB/FR SMBus Controller (SMBus serial bus, revision 0x03) at pci0 dev 31 function 3 not configured
isa0 at pcib0
pcppi0 at isa0 port 0x61
midi0 at pcppi0: PC speaker
sysbeep0 at pcppi0
isapnp0 at isa0 port 0x279: ISA Plug 'n Play device support
isapnp0: no ISA Plug 'n Play devices found
ioapic0: enabling
fd0 at fdc0 drive 0: 1.44MB, 80 cyl, 2 head, 18 sec
auich0: measured ac97 link rate at 47999 Hz, will use 48000 Hz
audio0 at auich0: full duplex, mmap, independent
Kernelized RAIDframe activated
atapibus0 at atabus0: 2 targets
cd0 at atapibus0 drive 0: <PHILIPS DVD+/-RW DVD8631, MY0W7065701594BR012, 9D03> cdrom removable
cd0: 32-bit data port
cd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
cd0(piixide0:0:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA)
uhub5 at uhub4 port 7
uhub5: NEC Corporation USB2.0 Hub Controller, class 9/0, rev 2.00/1.00, addr 2
uhub5: single transaction translator
uhub5: 4 ports with 4 removable, self powered
wd0 at atabus1 drive 0: <Maxtor 7Y250M0>
wd0: drive supports 16-sector PIO transfers, LBA48 addressing
wd0: 232 GB, 484406 cyl, 16 head, 63 sec, 512 bytes/sect x 488281250 sectors
wd0: 32-bit data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
wd0(piixide1:0:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133) (using DMA)
boot device: wd0
root on wd0a dumps on wd0b
root file system type: ffs
cpu1: CPU 1 running

		--Prof. Steven M. Bellovin, http://www.cs.columbia.edu/~smb