Hangs while building the tree in -current

[M Graff <explorer%flame.org@localhost>]

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On my ancient dual AMD cpu box, -current kernels hang while building the
tree.  It seems to occur at different locations, and I can ^C out and
"shutdown -r now" to reboot.  However, it crashes instead of shutting
down, or fails to sync the disks entirely, requiring a fsck on boot.

My Xen machines, with identical source, run fine both as amd64/domu and
i386/domu running under an older amd64/dom0.

This started a little over a week ago; I'm not certain of the exact time
as I was not tracking -current closely.

- --Michael

Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
~    2006, 2007, 2008
~    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
~    The Regents of the University of California.  All rights reserved.

NetBSD 4.99.64 (GENERIC) #1: Wed Jun 11 01:17:00 UTC 2008

explorer%speedy.home.flame.org@localhost:/usr/src/sys/arch/i386/compile/GENERIC
total memory = 2047 MB
avail memory = 1998 MB
timecounter: Timecounters tick every 10.000 msec
timecounter: Timecounter "i8254" frequency 1193182 Hz quality 100
TYAN PAULANER (X2.0)
mainbus0 (root)
cpu0 at mainbus0 apid 1: AMD 686-class, 1666MHz, id 0x662
cpu1 at mainbus0 apid 0: AMD 686-class, 1666MHz, id 0x662
ioapic0 at mainbus0 apid 2: pa 0xfec00000, version 11, 24 pins
acpi0 at mainbus0: Intel ACPICA 20080321
acpi0: X/RSDT: OemId <PTLTD ,  RSDT  ,06040000>, AslId < LTP,00000000>
acpi0: SCI interrupting at int 9
acpi0: fixed-feature power button present
acpi0: fixed-feature sleep button present
timecounter: Timecounter "ACPI-Safe" frequency 3579545 Hz quality 900
ACPI-Safe 24-bit timer
acpibut0 at acpi0 (PWRB, PNP0C0C): ACPI Power Button
attimer1 at acpi0 (TMR, PNP0100): AT Timer
attimer1: io 0x40-0x43 irq 0
pcppi1 at acpi0 (SPKR, PNP0800)
pcppi1: io 0x61
midi0 at pcppi1: PC speaker (CPU-intensive output)
sysbeep0 at pcppi1
npx1 at acpi0 (COPR, PNP0C04)
npx1: io 0xf0-0xff irq 13
npx1: reported by CPUID; using exception 16
pckbc1 at acpi0 (PS2M, PNP0F13): aux port
pckbc1: irq 12
pckbc2 at acpi0 (PS2K, PNP0303): kbd port
pckbc2: io 0x60,0x64 irq 1
COM1 (PNP0501) at acpi0 not configured
COM2 (PNP0501) at acpi0 not configured
LPT (PNP0400) at acpi0 not configured
FDC0 (PNP0700) at acpi0 not configured
apm0 at acpi0: Power Management spec V1.2
attimer1: attached to pcppi1
pckbd0 at pckbc2 (kbd slot)
pckbc2: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard
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: vendor 0x1022 product 0x700c (rev. 0x11)
agp0 at pchb0: aperture at 0xf0000000, size 0x8000000
ppb0 at pci0 dev 1 function 0: vendor 0x1022 product 0x700d (rev. 0x00)
pci1 at ppb0 bus 1
pci1: i/o space, memory space enabled
vga1 at pci1 dev 5 function 0: vendor 0x105d product 0x5348 (rev. 0x02)
wsdisplay0 at vga1 kbdmux 1: console (80x25, vt100 emulation), using wskbd0
wsmux1: connecting to wsdisplay0
drm at vga1 not configured
pcib0 at pci0 dev 7 function 0
pcib0: vendor 0x1022 product 0x7440 (rev. 0x05)
viaide0 at pci0 dev 7 function 1
viaide0: Advanced Micro Devices AMD768 IDE Controller (rev. 0x04)
viaide0: bus-master DMA support present
viaide0: primary channel configured to compatibility mode
viaide0: primary channel interrupting at ioapic0 pin 14
atabus0 at viaide0 channel 0
viaide0: secondary channel configured to compatibility mode
viaide0: secondary channel interrupting at ioapic0 pin 15
atabus1 at viaide0 channel 1
amdpm0 at pci0 dev 7 function 3: vendor 0x1022 product 0x7443 (rev. 0x03)
timecounter: Timecounter "amdpm0" frequency 3579545 Hz quality 1000
amdpm0: 24-bit timer
amdpm0: random number generator enabled (apprx. 61ms)
ppb1 at pci0 dev 16 function 0: vendor 0x1022 product 0x7448 (rev. 0x05)
pci2 at ppb1 bus 2
pci2: i/o space, memory space enabled
ohci0 at pci2 dev 0 function 0: vendor 0x1022 product 0x7449 (rev. 0x07)
ohci0: interrupting at ioapic0 pin 19
ohci0: OHCI version 1.0, legacy support
usb0 at ohci0: USB revision 1.0
emuxki0 at pci2 dev 4 function 0: vendor 0x1102 product 0x0002 (audio
multimedia, revision 0x08)
emuxki0: interrupting at ioapic0 pin 16
emuxki0: ac97: TriTech TR28602 codec; no 3D stereo
audio0 at emuxki0: full duplex, mmap, independent
joy0 at pci2 dev 4 function 1: vendor 0x1102 product 0x7002 (rev 0x08)
joy0: joystick not connected
ex0 at pci2 dev 8 function 0: 3Com 3c905C-TX 10/100 Ethernet with mngmt
(rev. 0x78)
ex0: interrupting at ioapic0 pin 19
ex0: MAC address 00:e0:81:22:d1:f1
exphy0 at ex0 phy 24: 3Com internal media interface
exphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
isa0 at pcib0
lpt0 at isa0 port 0x378-0x37b irq 7
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, working fifo
fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
uhub0 at usb0: vendor 0x1022 OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 4 ports with 4 removable, self powered
IPsec: Initialized Security Association Processing.
wd0 at atabus0 drive 0: <HDS722525VLAT80>
wd0: drive supports 16-sector PIO transfers, LBA48 addressing
wd0: 232 GB, 484518 cyl, 16 head, 63 sec, 512 bytes/sect x 488395055 sectors
wd0: 32-bit data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100)
wd0(viaide0:0:0): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using DMA)
atapibus0 at atabus1: 2 targets
cd0 at atapibus0 drive 0: <Pioneer DVD-ROM ATAPIModel DVD-106S 012, ,
E1.22> cdrom removable
cd0: 32-bit data port
cd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 4 (Ultra/66)
cd0(viaide0:1:0): using PIO mode 4, Ultra-DMA mode 4 (Ultra/66) (using DMA)
Kernelized RAIDframe activated
pad0: outputs: 44100Hz, 16-bit, stereo
audio1 at pad0: half duplex
boot device: wd0
root on wd0a dumps on wd0b
root file system type: ffs
wsdisplay0: screen 1 added (80x25, vt100 emulation)
wsdisplay0: screen 2 added (80x25, vt100 emulation)
wsdisplay0: screen 3 added (80x25, vt100 emulation)
wsdisplay0: screen 4 added (80x25, vt100 emulation)
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