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kernel panic - openbsd sparc64

My Netra T1 running OpenBSD 3.5 (sparc64) crashed today. I not sure what
the cause was - I was running "make test" while installing SpamAssassin
from source, and reading mail. Nothing too unusual. There was one other
user on the system; he apparently wasn't doing anything at the time. I
tried running the same command again later, and the machine didn't crash

After the crash, I checked the serial console, and it had dropped into
the kernel debugger.

Don't know if I'll be able to reproduce this or help test a fix (esp. if
it involves building a kernel - I've built kernels on FreeBSD some, but
never on OBSD), but thought I'd report it in case it's helpful... No
unusual kernel log messages in the dmesg output or in /var/log/messages.
No core files that I could find.

backtrace (this is all the info I have - let me know if there's anything
else I should collect if it happens again):
ddb> trace
pmap_enter_pv(e15c700, 405ea000, 28cc000, 0, 50877a8, 17a8) at pmap_enter_pv+0x1f4
pmap_enter(e15c700, 405ea000, 28cc000, 5, 1800, 4) at pmap_enter+0x394
uvm_fault(10, 405ea000, ffffffffffffffff, 4, 0, 5) at uvm_fault+0x11dc
text_access_fault(e63bed0, 64, 405eca38, 0, 0, 19f2bfff7f8) at text_access_fault+0x74
trapbase(0, 1, 0, 0, 0, 0) at trapbase+0x8a64

Most recent dmesg output:

console is /pci_(_at_)_1f,0/pci_(_at_)_1,1/ebus_(_at_)_1/su_(_at_)_14,3803f8
Copyright (c) 1982, 1986, 1989, 1991, 1993
	The Regents of the University of California.  All rights reserved.
Copyright (c) 1995-2004 OpenBSD. All rights reserved.  http://www.OpenBSD.org

OpenBSD 3.5 (GENERIC) #123: Mon Mar 29 16:12:59 MST 2004
total memory = 268435456
avail memory = 239263744
using 1638 buffers containing 13418496 bytes of memory
bootpath: /pci_(_at_)_1f,0/pci_(_at_)_1,1/scsi_(_at_)_2,0/disk_(_at_)_1,0
mainbus0 (root): Netra t1 (UltraSPARC-IIi 440MHz)
cpu0 at mainbus0: SUNW,UltraSPARC-IIi @ 440.055 MHz, version 0 FPU
cpu0: physical 32K instruction (32 b/l), 16K data (32 b/l), 2048K external (64 b/l)
psycho0 at mainbus0 addr 0xfffc0000
SUNW,sabre: impl 0, version 0: ign 7c0 bus range 0 to 3; PCI bus 0
DVMA map: c0000000 to e0000000
IOTDB: f6e000 to fee000
pci0 at psycho0
ppb0 at pci0 dev 1 function 1 "Sun Simba PCI-PCI" rev 0x13
pci1 at ppb0 bus 1
ebus0 at pci1 dev 1 function 0 "Sun PCIO Ebus2" rev 0x01
auxio0 at ebus0 addr 726000-726003, 728000-728003, 72a000-72a003, 72c000-72c003, 72f000-72f003
power at ebus0 addr 724000-724003 ipl 37 not configured
SUNW,pll at ebus0 addr 504000-504002 not configured
com0 at ebus0 addr 3803f8-3803ff ipl 28: ns16550a, 16 byte fifo
com0: console
com1 at ebus0 addr 3602f8-3602ff ipl 20: ns16550a, 16 byte fifo
lpt0 at ebus0 addr 340278-340287, 30015c-30015d, 700000-70000f ipl 34: polled
fdthree at ebus0 addr 3203f0-3203f7, 706000-70600f, 720000-720003 ipl 39 not configured
clock0 at ebus0 addr 0-1fff: mk48t59: hostid 80c2d50e
flashprom at ebus0 addr 0-fffff not configured
watchdog at ebus0 addr 200000-20003f ipl 4 not configured
display7seg at ebus0 addr 200040-200040 not configured
beeper0 at ebus0 addr 722000-722003: can't map register space
flashprom at ebus0 addr 400000-5fffff not configured
flashprom at ebus0 addr 800000-9fffff not configured
i2c at ebus0 addr 600000-600003 ipl 40 not configured
i2c at ebus0 addr 100000-100003 ipl 27 not configured
SUNW,lom at ebus0 addr 400000-400063 not configured
hme0 at pci1 dev 1 function 1 "Sun HME" rev 0x01: address 08:00:20:c2:d5:0e
ukphy0 at hme0 phy 0: Generic IEEE 802.3u media interface
ukphy0: OUI 0x00601d, model 0x000c, rev. 1
hme0: using ivec 3021 for interrupt
siop0 at pci1 dev 2 function 0 "Symbios Logic 53c875" rev 0x03: ivec 20, using 4K of on-board RAM
scsibus0 at siop0: 16 targets
siop0: target 1 now using 8 bit async xfers
sd0 at scsibus0 targ 1 lun 0: <SEAGATE, ST318404LSUN18G, 8507> SCSI3 0/direct fixed
sd0: 17274MB, 7508 cyl, 19 head, 248 sec, 512 bytes/sec, 35378533 sec total
hme1 at pci1 dev 3 function 1 "Sun HME" rev 0x01: address 08:00:20:c2:d5:0f
ukphy1 at hme1 phy 0: Generic IEEE 802.3u media interface
ukphy1: OUI 0x00601d, model 0x000c, rev. 1
hme1: using ivec 301a for interrupt
ppb1 at pci0 dev 1 function 0 "Sun Simba PCI-PCI" rev 0x13
pci2 at ppb1 bus 2
ppb2 at pci2 dev 1 function 0 "DEC 21150 PCI-PCI" rev 0x04
pci3 at ppb2 bus 3
pciide0 at pci3 dev 14 function 0 "CMD Technology PCI0646" rev 0x03: DMA, channel 0 configured to native-PCI, channel 1 configured to native-PCI
pciide0: using ivec 1800 for native-PCI interrupt
pciide0: channel 0 disabled (no drives)
pciide0: channel 1 disabled (no drives)
pcons at mainbus0 not configured
No counter-timer -- using %tick at 440MHz as system clock.
root on sd0a
rootdev=0x700 rrootdev=0x1100 rawdev=0x1102
WARNING: / was not properly unmounted