I have a Dell 400SC running a kernel from a cvs update yesterday of
the netbsd-4 branch with a manual pull up PR/35970 (so I can actually
use ld0).  There's only been one kernel commit since then for some LAN
controller support.

The machine has run NetBSD for several years and run 2.x and 3.x and
was running 3.0_STABLE since last June.  Recently I added in an ld0
and moved to 4.0_BETA2 and found that whenever the machine hit swap
(discerned by watching top) the machine would wedge.  Most of the time
I was running X, so no debugger, but the one time I was not, I had a
kernel message:

	uvm_fault(0xc0a534c, 0xf0000, 2) -> 0xe

and couldn't get into the debugger and had to power cycle.

I'm at something of a loss to explain this but it's rather inconvenient
to avoid swapping...

I'm not even sure where to begin.  Any thoughts?  dmesg attached.

(as an aisde, the copyright doesn't include 2007).

-Todd

---<snip>---

Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
    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 4.0_BETA2 (GENERIC) #1: Tue May  1 20:51:21 CEST 2007
	kovert@slivovice.cz.omniscient.com:/usr/obj/4.0-stable/i386/usr/src/os/NetBSD-4.0-branch/src/sys/arch/i386/compile/GENERIC
total memory = 1023 MB
rbus: rbus_min_start set to 0x40000000
avail memory = 995 MB
timecounter: Timecounters tick every 10.000 msec
timecounter: Timecounter "i8254" frequency 1193182 Hz quality 100
BIOS32 rev. 0 found at 0xffe90
mainbus0 (root)
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel Pentium 4 (686-class), 2793.09 MHz, id 0xf29
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 4400<CID,xTPR>
cpu0: "Intel(R) Pentium(R) 4 CPU 2.80GHz"
cpu0: I-cache 12K uOp cache 8-way, D-cache 8 KB 64B/line 4-way
cpu0: L2 cache 512 KB 64B/line 8-way
cpu0: ITLB 4K/4M: 64 entries
cpu0: DTLB 4K/4M: 64 entries
cpu0: enabling thermal monitor 1 ... enabled.
cpu0: calibrating local timer
cpu0: apic clock running at 199 MHz
cpu0: 16 page colors
cpu1 at mainbus0: apid 1 (application processor)
cpu1: not started
ioapic0 at mainbus0 apid 2 (I/O APIC)
ioapic0: pa 0xfec00000, version 20, 24 pins
ioapic0: misconfigured as apic 0
ioapic0: remapped to apic 2
acpi0 at mainbus0: Advanced Configuration and Power Interface
acpi0: using Intel ACPI CA subsystem version 20060217
acpi0: X/RSDT: OemId <DELL  , PE400SC,00000008>, AslId <ASL ,00000061>
acpi0: SCI interrupting at int 9
acpi0: fixed-feature power button present
timecounter: Timecounter "ACPI-Fast" frequency 3579545 Hz quality 1000
ACPI-Fast 24-bit timer
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
PNP0C01 [System Board] at acpi0 not configured
PNP0A03 [PCI/PCI-X Host Bridge] at acpi0 not configured
PNP0200 [AT DMA Controller] at acpi0 not configured
npx1 at acpi0 (PNP0C04)
npx1: io 0xf0-0xff irq 13
npx1: reported by CPUID; using exception 16
PNP0000 [AT Interrupt Controller] at acpi0 not configured
pcppi1 at acpi0 (PNP0800)
pcppi1: io 0x61
pcppi1: children must have an explicit unit
midi0 at pcppi1: PC speaker (CPU-intensive output)
sysbeep0 at pcppi1
PNP0B00 [AT Real-Time Clock] at acpi0 not configured
attimer1 at acpi0 (PNP0100): AT Timer
attimer1: io 0x40-0x5f irq 0
PNP0700 [PC standard floppy disk controller] at acpi0 not configured
pckbc1 at acpi0 (PNP0303): kbd port
pckbc1: io 0x60,0x64 irq 1
pckbc2 at acpi0 (PNP0F13): aux port
pckbc2: irq 12
com3 at acpi0 (PNP0501-1)
com3: io 0x3f8-0x3ff irq 4
com3: ns16550a, working fifo
com4 at acpi0 (PNP0501-2)
com4: io 0x2f8-0x2ff irq 3
com4: ns16550a, working fifo
lpt3 at acpi0 (PNP0401)
lpt3: io 0x378-0x37f,0x778-0x77f irq 7
PNP0C01 [System Board] 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
PNP0C0F [PCI interrupt link device] at acpi0 not configured
pcppi1: attached to attimer1
pckbd0 at pckbc1 (kbd slot)
pckbc1: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard
pms0 at pckbc1 (aux slot)
pckbc1: 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 82875P Host (rev. 0x02)
pchb0: random number generator enabled
agp0 at pchb0: aperture at 0xc0000000, size 0x8000000
ppb0 at pci0 dev 1 function 0: Intel 82875P AGP (rev. 0x02)
pci1 at ppb0 bus 1
pci1: i/o space, memory space enabled
vga1 at pci1 dev 0 function 0: ATI Technologies product 0x4155 (rev. 0x80)
wsdisplay0 at vga1 kbdmux 1: console (80x25, vt100 emulation), using wskbd0
wsmux1: connecting to wsdisplay0
ATI Technologies product 0x4175 (miscellaneous display, revision 0x80) at pci1 dev 0 function 1 not configured
uhci0 at pci0 dev 29 function 0: Intel 82801EB/ER USB UHCI Controller (rev. 0x02)
uhci0: interrupting at ioapic0 pin 16 (irq 11)
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 82801EB/ER USB UHCI Controller (rev. 0x02)
uhci1: interrupting at ioapic0 pin 19 (irq 10)
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 82801EB/ER USB UHCI Controller (rev. 0x02)
uhci2: interrupting at ioapic0 pin 18 (irq 9)
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 82801EB/ER USB UHCI Controller (rev. 0x02)
uhci3: interrupting at ioapic0 pin 16 (irq 11)
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 82801EB/ER USB EHCI Controller (rev. 0x02)
ehci0: interrupting at ioapic0 pin 23 (irq 5)
ehci0: BIOS has given up ownership
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: 8 ports with 8 removable, self powered
ppb1 at pci0 dev 30 function 0: Intel 82801BA Hub-PCI Bridge (rev. 0xc2)
pci2 at ppb1 bus 2
pci2: i/o space, memory space enabled
ATI Technologies Rage XL (VGA display, revision 0x27) at pci2 dev 0 function 0 not configured
fwohci0 at pci2 dev 1 function 0: VIA Technologies VT6306 IEEE 1394 Host Controller (rev. 0x46)
fwohci0: interrupting at ioapic0 pin 22 (irq 5)
fwohci0: OHCI version 1.0 (ROM=1)
fwohci0: No. of Isochronous channels is 8.
fwohci0: EUI64 00:11:06:00:00:00:43:3e
fwohci0: Phy 1394a available S400, 3 ports.
fwohci0: Link S400, max_rec 2048 bytes.
ieee1394if0 at fwohci0: IEEE1394 bus
fwip0 at ieee1394if0: IP over IEEE1394
fwohci0: Initiate bus reset
eap0 at pci2 dev 2 function 0: Ensoniq AudioPCI 97 ES1373-B (rev. 0x06)
eap0: interrupting at ioapic0 pin 17 (irq 10)
eap0: ac97: Crystal CS4297 codec; headphone, 18 bit DAC, 18 bit ADC, no 3D stereo
audio0 at eap0: full duplex, mmap, independent
midi1 at eap0: AudioPCI MIDI UART
aac0 at pci2 dev 3 function 0: HP ML110 G2 (Adaptec ASR-2610SA)
aac0: interrupting at ioapic0 pin 19 (irq 10)
aac0: i80303 at 100MHz, 64MB mem (48MB cache), optional battery not installed
aac0: Kernel 4.2-1 [Build 7368], Monitor 4.2-1 [Build 7368], S/N C38449
aac0: Controller supports: 3017c<WCACHE,DATA64,HOSTTIME,RAID50,WINDOW4GB,SOFTERR>
ld0 at aac0 unit 0: RAID 5
ld0: 745 GB, 97260 cyl, 255 head, 63 sec, 512 bytes/sect x 1562492928 sectors
wm0 at pci2 dev 12 function 0: Intel i82540EM 1000BASE-T Ethernet, rev. 2
wm0: interrupting at ioapic0 pin 18 (irq 9)
wm0: 32-bit 33MHz PCI bus
wm0: 256 word (8 address bits) MicroWire EEPROM
wm0: Ethernet address 00:11:11:4d:86:da
makphy0 at wm0 phy 1: Marvell 88E1011 Gigabit PHY, rev. 3
makphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto
pcib0 at pci0 dev 31 function 0
pcib0: Intel 82801EB LPC Interface Bridge (rev. 0x02)
piixide0 at pci0 dev 31 function 1
piixide0: Intel 82801EB IDE Controller (ICH5) (rev. 0x02)
piixide0: bus-master DMA support present
piixide0: primary channel configured to compatibility mode
piixide0: primary channel ignored (disabled)
piixide0: secondary channel configured to compatibility mode
piixide0: secondary channel interrupting at ioapic0 pin 15 (irq 15)
atabus0 at piixide0 channel 1
piixide1 at pci0 dev 31 function 2
piixide1: Intel 82801EB Serial ATA Controller (rev. 0x02)
piixide1: bus-master DMA support present
piixide1: primary channel configured to native-PCI mode
piixide1: using ioapic0 pin 18 (irq 9) for native-PCI interrupt
atabus1 at piixide1 channel 0
piixide1: secondary channel configured to native-PCI mode
atabus2 at piixide1 channel 1
Intel 82801EB/ER SMBus Controller (SMBus serial bus, revision 0x02) at pci0 dev 31 function 3 not configured
auich0 at pci0 dev 31 function 5: i82801EB (ICH5) AC-97 Audio
auich0: interrupting at ioapic0 pin 17 (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>
isa0 at pcib0
isapnp0 at isa0 port 0x279: ISA Plug 'n Play device support
fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
isapnp0: no ISA Plug 'n Play devices found
ioapic0: enabling
timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
fwohci0: node_id=0xc800ffc0, gen=1, CYCLEMASTER mode
ieee1394if0: 1 nodes, maxhop <= 0, cable IRM = 0 (me)
ieee1394if0: bus manager 0 (me)
auich0: measured ac97 link rate at 47998 Hz, will use 48000 Hz
audio1 at auich0: full duplex, mmap, independent
fd0 at fdc0 drive 0: 1.44MB, 80 cyl, 2 head, 18 sec
Kernelized RAIDframe activated
atapibus0 at atabus0: 2 targets
cd0 at atapibus0 drive 0: <PLEXTOR DVDR   PX-708A, 112304, 1.01> cdrom removable
cd0: 32-bit data port
cd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
cd1 at atapibus0 drive 1: <GCR-8483B, , 1.05> cdrom removable
cd1: 32-bit data port
cd1: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
cd0(piixide0:1:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA)
cd1(piixide0:1:1): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA)
boot device: ld0
root on ld0a dumps on ld0b
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)