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OpenBSD repeatable uvm_fault running tar



I'm having the following problem on a generic 2.9 openbsd kernel when
unpacking the ports package.
This is after a fresh install, it happens other times but I can repeat it
every single time this way.

the following commands are performed

cd /usr
tar zxvf ~/ports.tar.gz OR tar zxvf /mnt/ports.tar.gz (when mnt is
/dev/cd0a)

tar will begin outputting the list of files it compresses then get to a file
'CVS' and print:

uvm_fault(0xe4d0bcc4,0x0,0,3) -> 1

It will print this several times, each one slightly indented and will lock
the computer solid. I have included the output from dmesg but I can provide
more detail if necessary. I could not provide a traceback because the kernel
would not respond after displaying uvm_fault(...) several times.

dmesg:

OpenBSD 2.9 (GENERIC) #653: Sat Apr 28 13:57:59 MDT 2001
    deraadt@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC
cpu0: F00F bug workaround installed
cpu0: Intel Pentium/MMX ("GenuineIntel" 586-class) 167 MHz
cpu0: FPU,V86,DE,PSE,TSC,MSR,MCE,CX8,MMX
real mem  = 49917952 (48748K)
avail mem = 41328640 (40360K)
using 634 buffers containing 2596864 bytes (2536K) of memory
mainbus0 (root)
bios0 at mainbus0: AT/286+(ab) BIOS, date 01/16/97, BIOS32 rev. 0 @ 0xfb400
apm0 at bios0: Power Management spec V1.2
apm0: AC on, battery charge unknown
pcibios0 at bios0: rev. 2.1 @ 0xf0000/0xb8c4
pcibios0: PCI BIOS has 6 Interrupt Routing table entries
pcibios0: PCI bus #0 is the last bus
bios0: ROM list: 0xc0000/0x8000
pci0 at mainbus0 bus 0: configuration mode 1 (bios)
pchb0 at pci0 dev 0 function 0 "Intel 82437VX" rev 0x02
pcib0 at pci0 dev 7 function 0 "Intel 82371SB PCI-ISA" rev 0x01
pciide0 at pci0 dev 7 function 1 "Intel 82371SB IDE" rev 0x00: DMA, channel
0 wi
red to compatibility, channel 1 wired to compatibility
wd0 at pciide0 channel 0 drive 0: <ST52520A>
wd0: 16-sector PIO, LBA, 2446MB, 4970 cyl, 16 head, 63 sec, 5009760 sectors
pciide0: channel 0 interrupting at irq 14
wd0(pciide0:0:0): using PIO mode 4, DMA mode 2
atapiscsi0 at pciide0 channel 1
scsibus0 at atapiscsi0: 2 targets
cd0 at scsibus0 targ 1 lun 0: <TATUNG, CD-1212E, 7.67> SCSI0 5/cdrom
removable
pciide0: channel 1 interrupting at irq 15
cd0(pciide0:1:1): using PIO mode 3
xl0 at pci0 dev 8 function 0 "3Com 3c900B 10Mbps-TPC" rev 0x04: irq 11
address 0
0:10:5a:87:cc:d6
xl0: selecting 10baseT transceiver, half duplex
vga1 at pci0 dev 10 function 0 "S3 ViRGE DX/GX" rev 0x01
wsdisplay0 at vga1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
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: <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
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec
biomask c040 netmask c840 ttymask c8c2
pctr: 586-class performance counters and user-level cycle counter enabled
dkcsum: wd0 matched BIOS disk 80
root on wd0a
rootdev=0x0 rrootdev=0x300 rawdev=0x302
WARNING: / was not properly unmounted
tun0: not multicast capable, IPv6 not enabled