I just installed an old compaq desktop that I intend to use as a

webserver. I haven't installed anything on it yet, it's using vanilla

4.2-RELEASE.

Twice now, I've booted it and left it running, intending to ssh in and

work on it, except I've found that I couldn't because it's crashed on

me. It has literally nothing running except the standard daemons

(ntpd, sshd, httpd...) when this (faithfully transcribed) happens:

uvm_fault(0xd687875c, 0xcfc70000, 0, 1) -> e

kernel: page fault trap, code=0

Stopped at      pmap_enter+0xaf:                movl    0(%edx,%eax,4),%eax

ddb> trace

pmap_enter(d69c7a2c, 1c022000, 2353000,5,20,1c027000,da433ea4,0) at

pmap_enter+0xaf

uvm_fault(d687875c,1c023000,0,1,da3efea0) at uvm_fault+0xd0c

trap() at trap+0x269

--- trap (number 6) --

0x1c023261:

ddb> ps

PID     PPID    PGRP    UID     S       FLAGS   WAIT    COMMAND

1311    17544   648     0       2       0               sh

*22991  17544   648     0       7       0               sh

17544   14843   648     0       3       0x80    pause   sh

14843   27930   648     0       3       0x4080  piperd  sh

22189   648     648     0       3       0x4080  piperd  mail

15690   648     648     0       3       0x4080  piperd  tee

27930   648     648     0       3       0x4080  pause   sh

648     11321   648     0       3       0x4080  pause   sh

11321   4468    4468    0       3       0x80    piperd  cron

6321    1       6321    0       3       0x4082  ttyin   getty

16590   1       16590   0       3       0x4082  ttyin   getty

28581   1       28581   0       3       0x4082  ttyin   getty

29125   1       29125   0       3       0x4082  ttyin   getty

13313   1       13313   0       3       0x4082  ttyin   getty

4468    1       4468    0       3       0x80    select  cron

30525   1       30525   0       3       0x80    select  sshd

14729   5611    5611    67      3       0x180   netcon  httpd

11199   5611    5611    67      3       0x180   netcon  httpd

20250   5611    5611    67      3       0x180   netcon  httpd

7697    5611    5611    67      3       0x180   netcon  httpd

1843    5611    5611    67      3       0x180   netcon  httpd

24949   1       24949   0       3       0x40180 select  sendmail

8752    1       8752    0       3       0x180   select  inetd

5611    1       5611    67      3       0x180   select  httpd

20884   29121   29121   83      3       0x180   poll    ntpd

29121   1       29121   0       3       0x80    poll    ntpd

13148   1       12414   73      2       0x180           syslogd

12414   1       12414   0       3       0x88    netio   syslogd

3628    1       3628    77      3       0x180   poll    dhclient

14719   1       24228   0       3       0x82    poll    dhclient

16      0       0       0       3       0x100200        crypto_wait     crypto

15      0       0       0       3       0x100200        aiodoned        aiodoned

14      0       0       0       3       0x100200        syncer  update

13      0       0       0       3       0x100200        cleaner cleaner

12      0       0       0       3       0x100200        reaper  reaper

11      0       0       0       3       0x100200        pgdaemon

 pagedaemon

10      0       0       0       3       0x100200        pftm    pfpurge

9       0       0       0       3       0x100200        usbevt  usb4

8       0       0       0       3       0x100200        usbevt  usb3

7       0       0       0       3       0x100200        usbevt  usb2

6       0       0       0       3       0x100200        usbevt  usb1

5       0       0       0       3       0x100200        usbtsl  usbtask

4       0       0       0       3       0x100200        usbevt  usb0

3       0       0       0       3       0x100200        bored   syswq

2       0       0       0       3       0x100200        kmalloc kmthread

1       0       1       0       3       0x4080  wait    init

0       -1      0       0       3       0x80200 scheduler       swapper
So what's the deal? Is this a bug? Is it flakey hardware? I mixed and

matched the RAM a bit, could that be it? Could the RAM be slightly

unseated?
I found this, which has the same issue:

http://archive.netbsd.se/?ml=openbsd-newbies&a=2005-08&m=1127711
dmesg:

OpenBSD 4.2 (GENERIC) #375: Tue Aug 28 10:38:44 MDT 2007

    deraadt@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC

cpu0: AMD Duron(tm) Processor ("AuthenticAMD" 686-class, 64KB L2 cache) 902 MHz

cpu0: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR

real mem  = 528052224 (503MB)

avail mem = 502943744 (479MB)

mainbus0 at root

bios0 at mainbus0: AT/286+ BIOS, date 05/03/01, BIOS32 rev. 0 @

0xfa100, SMBIOS rev. 2.3 @ 0xf0000 (19 entries)

bios0: vendor Compaq version "786K3" date 05/03/2001

bios0: Compaq Presario 5100CA 470013-866

pcibios0 at bios0: rev 2.1 @ 0xfa040/0x1000

pcibios0: PCI IRQ Routing Table rev 1.0 @ 0xfa040/128 (6 entries)

pcibios0: PCI Interrupt Router at 000:20:0 ("VIA VT82C686 ISA" rev 0x00)

pcibios0: PCI bus #1 is the last bus

bios0: ROM list: 0xc0000/0x10000 0xe9000/0x3000! 0xec000/0x4000!

acpi at mainbus0 not configured

cpu0 at mainbus0

pci0 at mainbus0 bus 0: configuration mode 1 (no bios)

pchb0 at pci0 dev 0 function 0 "VIA VT8363 Host" rev 0x81

ppb0 at pci0 dev 1 function 0 "VIA VT8363 AGP" rev 0x00

pci1 at ppb0 bus 1

vga1 at pci1 dev 0 function 0 "S3 ProSavage KM133" rev 0x00

wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)

wsdisplay0: screen 1-5 added (80x25, vt100 emulation)

dc0 at pci0 dev 3 function 0 "ADMtek AN983" rev 0x11: irq 3, address

00:04:5a:60:f5:5b

acphy0 at dc0 phy 1: AC_UNKNOWN 10/100 PHY, rev. 0

ohci0 at pci0 dev 4 function 0 "NEC USB" rev 0x41: irq 10, version 1.0

ohci1 at pci0 dev 4 function 1 "NEC USB" rev 0x41: irq 11, version 1.0

ehci0 at pci0 dev 4 function 2 "NEC USB" rev 0x02: irq 3

usb0 at ehci0: USB revision 2.0

uhub0 at usb0: NEC EHCI root hub, rev 2.00/1.00, addr 1

pcib0 at pci0 dev 20 function 0 "VIA VT82C686 ISA" rev 0x22

pciide0 at pci0 dev 20 function 1 "VIA VT82C571 IDE" rev 0x10: ATA66,

channel 0 configured to compatibility, channel 1 configured to

compatibility

wd0 at pciide0 channel 0 drive 0:

wd0: 8-sector PIO, LBA, 38172MB, 78177792 sectors

wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 4

atapiscsi0 at pciide0 channel 1 drive 1

scsibus0 at atapiscsi0: 2 targets

cd0 at scsibus0 targ 0 lun 0:  SCSI0 5/cdrom removable

cd0(pciide0:1:1): using PIO mode 4, Ultra-DMA mode 2

uhci0 at pci0 dev 20 function 2 "VIA VT83C572 USB" rev 0x10: irq 11

uhci1 at pci0 dev 20 function 3 "VIA VT83C572 USB" rev 0x10: irq 11

viaenv0 at pci0 dev 20 function 4 "VIA VT82C686 SMBus" rev 0x30: HWM

disabled: 32-bit timer at 3579545Hz

auvia0 at pci0 dev 20 function 5 "VIA VT82C686 AC97" rev 0x20: irq 10

ac97: codec id 0x41445348 (Analog Devices AD1881A)

ac97: codec features headphone, Analog Devices Phat Stereo

audio0 at auvia0

usb1 at ohci0: USB revision 1.0

uhub1 at usb1: NEC OHCI root hub, rev 1.00/1.00, addr 1

usb2 at ohci1: USB revision 1.0

uhub2 at usb2: NEC OHCI root hub, rev 1.00/1.00, addr 1

isa0 at pcib0

isadma0 at isa0

pckbc0 at isa0 port 0x60/5

pckbd0 at pckbc0 (kbd slot)

pckbc0: using irq 1 for kbd slot

wskbd0 at pckbd0: console keyboard, using wsdisplay0

pcppi0 at isa0 port 0x61

midi0 at pcppi0:

spkr0 at pcppi0

lpt0 at isa0 port 0x378/4 irq 7

npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16

pccom0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo

fdc0 at isa0 port 0x3f0/6 irq 6 drq 2

usb3 at uhci0: USB revision 1.0

uhub3 at usb3: VIA UHCI root hub, rev 1.00/1.00, addr 1

usb4 at uhci1: USB revision 1.0

uhub4 at usb4: VIA UHCI root hub, rev 1.00/1.00, addr 1

biomask ff6d netmask ff6d ttymask ffef

pctr: user-level cycle counter enabled

mtrr: Pentium Pro MTRR support

dkcsum: wd0 matches BIOS drive 0x80

root on wd0a swap on wd0b dump on wd0b

WARNING: / was not properly unmounted