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UVM problems on OpenBSD 2.8-Release (i386)

I'm having problems with a machine running (or installing) OpenBSD 
2.8.  I posted information about memory problems before and someone 
pointed out that I may have some bad ram.  I replaced the ram with 
known good ram and am having the same problems.  The kernel typically 
panics with some problem with UVM.  Here is the text from the last 
panic (the machine didn't reboot so I was able to write it down)

uvm_fault(0xe5a55960, 0xa62dc000, 0, 1) -> 1
kernel: page fault trap, code=0
Stopped at      _sys_unlink+0x36:       incl    0xc08510c4(%ebx)

Using the floppy28.fs install floppy I typically get panics during 
the start of the ftp tranfer or slightly earlier.  I was not able to 
install using this image.  Using the floppy28B.fs image, I was able 
to successfully install the system, but upon reboot the system 
paniced with the above listed message while trying to edit a file 
with vi.  I also thought my machine may have been hacked so I that is 
why I was reinstalling.

Thanks for any help.  This is not a production machine (it is not 
stable enough to be one) so I'm willing to try some stuff.

See dmesg below for hardware clues.  The hardware is as follows:
ABIT PX5 Intel 430TX chipset Socket 7 motherboard
64 MB PC-100 SDRAM (DIMM slot 1)
Cyrix (IBM labeled) 6x86-120 MHz processor (Cyrix CPU fan)
Trident ISA video card (VGA)
Netgear PCI 10/100 Ethernet FA310-TX (genuine DEC 21140 based)
Generic ISA NE2000 10 Mbps Ethernet adapter 
(I can get manufacturer details if needed)
Seagate 6.5GB ATA-33 Hard drive
2 1.44 MB floppy drives (both seem to work fine)

=====dmesg (boot after kernel paniced)========
OpenBSD 2.8 (GENERIC) #399: Mon Nov  6 10:59:23 MST 2000
cpu0: xchg bug workaround performed
cpu0: Cyrix 6x86 (486-class)
real mem  = 66695168 (65132K)
avail mem = 56823808 (55492K)
using 839 buffers containing 3436544 bytes (3356K) of memory
mainbus0 (root)
bios0 at mainbus0: AT/286+(b6) BIOS, date 11/13/98, BIOS32 rev. 0 @ 
apm0 at bios0: Power Management spec V1.2
apm0: AC on, battery charge unknown
pcibios0 at bios0: rev. 2.1 found at 0xf0000[0xb938]
pcibios0: PCI IRQ Routing Table rev. 1.0 found at 0xfddf0, size 128 
bytes (6 entries)
pcibios0: PCI Interrupt Router at 000:07:0 ("Intel 82371SB (Triton 
II) PCI-ISA" rev 0x00)
pcibios0: PCI Exclusive IRQs: 10 11
pcibios0: PCI bus #0 is the last bus
pci0 at mainbus0 bus 0: configuration mode 1 (bios)
pchb0 at pci0 dev 0 function 0 "Intel 82439TX System (MTXC)" rev 0x01
pcib0 at pci0 dev 7 function 0 "Intel 82371AB PIIX4 ISA" rev 0x01
pciide0 at pci0 dev 7 function 1 "Intel 82371AB IDE (PIIX4)" rev 
0x01: DMA, channel 0 wired to compatibility, channel 1 wired to 
wd0 at pciide0 channel 0 drive 0: <ST36531A>
wd0: can use 32-bit, PIO mode 4, DMA mode 2, Ultra-DMA mode 2
wd0: 32-sector PIO, LBA, 6204MB, 13446 cyl, 15 head, 63 sec, 12706470 
pciide0: channel 0 interrupting at irq 14
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2 (using DMA data 
"Intel 82371AB USB (PIIX4)" rev 0x01 at pci0 dev 7 function 2 not 
"Intel 82371AB Power Management (PIIX4)" rev 0x01 at pci0 dev 7 
function 3 not configured
de0 at pci0 dev 13 function 0 "DEC DECchip 21140 (FasterNet)" rev 
0x22: irq 10
de0: 21140A [10-100Mb/s] pass 2.2 address 00:80:c8:68:1a:c3
isa0 at pcib0
isadma0 at isa0
ne0 at isa0 port 0x240/32 irq 9
ne0: NE2000 Ethernet
ne0: address 00:40:05:33:f7:1b
pcppi0 at isa0 port 0x61
midi0 at pcppi0: <PC speaker>
sysbeep0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
npx0 at isa0 port 0xf0/16: using exception 16
pccom0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
pccom1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
vt0 at isa0 port 0x60/16 irq 1: vga 80 col, color, 8 scr, mf2-kbd
pms0 at vt0 irq 12
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec
fd1 at fdc0 drive 1: 1.44MB 80 cyl, 2 head, 18 sec
biomask 4040 netmask 4640 ttymask 56c2
pctr: no performance counters in CPU
dkcsum: wd0 matched BIOS disk 80
root on wd0a
rootdev=0x0 rrootdev=0x300 rawdev=0x302
WARNING: / was not properly unmounted
de0: enabling Full Duplex 100baseTX port
=====dmesg (end)===========


George Morgan
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