hard lock-up writing to tape

I'm using -current cvsup'd as of Nov 15, 2003.  When I try to do a
dump or run the btape (fill command) program from bacula, my machine
will lock up hard.  Doesn't respond to ping.  No access to kernel
debugger.  Num lock doesn't come on.

I can perform a dump or run the btape fill program when in single
user mode, but in multi-user the machine will only stay up for
a short while before locking.

This has been happening since I got the tape system (Sparcstorage
Library) about 3-4 weeks ago.  I don't know how long the problem
existed before then as I didn't have a tape system to use.

I've tried two types of SCSI cards: Adaptec 2930 and ASUS PCI-SC200
(sym(4) device).  Both behave the same.

I wonder if it could be network or interrupt related.  In single
user mode, the network interface is not up.

Dmesg from my system follows:
Copyright (c) 1992-2003 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
	The Regents of the University of California. All rights reserved.
FreeBSD 5.1-CURRENT #57: Sat Nov 15 15:50:50 MST 2003
    root_at_man.boogie.com:/disk2/obj/disk2/src/sys/BOOGIE
Preloaded elf kernel "/boot/kernel/kernel" at 0xc0a93000.
Preloaded elf module "/boot/kernel/linux.ko" at 0xc0a931f4.
Preloaded elf module "/boot/kernel/snd_pcm.ko" at 0xc0a932a0.
Preloaded elf module "/boot/kernel/snd_via82c686.ko" at 0xc0a9334c.
Preloaded elf module "/boot/kernel/sym.ko" at 0xc0a93400.
Preloaded elf module "/boot/kernel/nvidia.ko" at 0xc0a934a8.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: AMD Athlon(tm) processor (1002.28-MHz 686-class CPU)
  Origin = "AuthenticAMD"  Id = 0x642  Stepping = 2
  Features=0x183f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR>
  AMD Features=0xc0440000<RSVD,AMIE,DSP,3DNow!>
real memory  = 1073676288 (1023 MB)
avail memory = 1033502720 (985 MB)
Pentium Pro MTRR support enabled
npx0: [FAST]
npx0: <math processor> on motherboard
npx0: INT 16 interface
acpi0: <VIA694 AWRDACPI> on motherboard
pcibios: BIOS version 2.10
Using $PIR table, 8 entries at 0xc00fde30
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x4008-0x400b on acpi0
acpi_cpu0: <CPU> on acpi0
acpi_button0: <Power Button> on acpi0
pcib0: <ACPI Host-PCI bridge> port 
0x6000-0x607f,0x5000-0x500f,0x4080-0x40ff,0x4000-0x407f,0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib0: slot 7 INTD is routed to irq 11
pcib0: slot 7 INTD is routed to irq 11
pcib0: slot 7 INTC is routed to irq 10
pcib0: slot 9 INTA is routed to irq 9
pcib0: slot 9 INTA is routed to irq 9
pcib0: slot 9 INTA is routed to irq 9
pcib0: slot 9 INTA is routed to irq 9
pcib0: slot 10 INTA is routed to irq 10
pcib0: slot 11 INTA is routed to irq 11
pcib0: slot 12 INTA is routed to irq 10
pcib0: slot 13 INTA is routed to irq 11
agp0: <VIA 82C8363 (Apollo KT133A) host to PCI bridge> mem 
0xd0000000-0xd7ffffff at device 0.0 on pci0
pcib1: <PCI-PCI bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
pcib0: slot 1 INTA is routed to irq 5
pcib1: slot 0 INTA is routed to irq 5
nvidia0: <GeForce4 MX 440 with AGP8X> mem 
0xd8000000-0xdfffffff,0xe0000000-0xe0ffffff irq 5 at device 0.0 on pci1
isab0: <PCI-ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <VIA 82C686B UDMA100 controller> port 0xa000-0xa00f at device 7.1 on 
pci0
atapci0: Correcting VIA config for southbridge data corruption bug
ata0: at 0x1f0 irq 14 on atapci0
ata0: [MPSAFE]
ata1: at 0x170 irq 15 on atapci0
ata1: [MPSAFE]
uhci0: <VIA 83C572 USB controller> port 0xa400-0xa41f irq 11 at device 7.2 on 
pci0
usb0: <VIA 83C572 USB controller> on uhci0
usb0: USB revision 1.0
uhub0: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhci1: <VIA 83C572 USB controller> port 0xa800-0xa81f irq 11 at device 7.3 on 
pci0
usb1: <VIA 83C572 USB controller> on uhci1
usb1: USB revision 1.0
uhub1: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
viapropm0: SMBus I/O base at 0x5000
viapropm0: <VIA VT82C686A Power Management Unit> port 0x5000-0x500f at device 
7.4 on pci0
viapropm0: SMBus revision code 0x40
smbus0: <System Management Bus> on viapropm0
smb0: <SMBus generic I/O> on smbus0
pcm0: <VIA VT82C686A> port 0xb400-0xb403,0xb000-0xb003,0xac00-0xacff irq 10 at 
device 7.5 on pci0
pcm0: <ICEnsemble ICE1232 AC97 Codec>
ohci0: <OHCI (generic) USB controller> mem 0xe3006000-0xe3006fff irq 9 at 
device 9.0 on pci0
usb2: OHCI version 1.0, legacy support
usb2: <OHCI (generic) USB controller> on ohci0
usb2: USB revision 1.0
uhub2: (0x11c1) OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 1 port with 1 removable, self powered
ohci1: <OHCI (generic) USB controller> mem 0xe3007000-0xe3007fff irq 9 at 
device 9.1 on pci0
usb3: OHCI version 1.0, legacy support
usb3: <OHCI (generic) USB controller> on ohci1
usb3: USB revision 1.0
uhub3: (0x11c1) OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub3: 1 port with 1 removable, self powered
ohci2: <OHCI (generic) USB controller> mem 0xe3004000-0xe3004fff irq 9 at 
device 9.2 on pci0
usb4: OHCI version 1.0, legacy support
usb4: <OHCI (generic) USB controller> on ohci2
usb4: USB revision 1.0
uhub4: (0x11c1) OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub4: 1 port with 1 removable, self powered
ohci3: <OHCI (generic) USB controller> mem 0xe3005000-0xe3005fff irq 9 at 
device 9.3 on pci0
usb5: OHCI version 1.0, legacy support
usb5: <OHCI (generic) USB controller> on ohci3
usb5: USB revision 1.0
uhub5: (0x11c1) OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub5: 1 port with 1 removable, self powered
puc0: <NetMos NM9835 Dual UART and 1284 Printer port> port 
0xcc00-0xcc0f,0xc800-0xc807,0xc400-0xc407,0xc000-0xc007,0xbc00-0xbc07,0xb800-0xb807 
irq 10 at device 10.0 on pci0
sio4: <NetMos NM9835 Dual UART and 1284 Printer port> on puc0
sio4: type 16550A
sio4: unable to activate interrupt in fast mode - using normal mode
sio5: <NetMos NM9835 Dual UART and 1284 Printer port> on puc0
sio5: type 16550A
sio5: unable to activate interrupt in fast mode - using normal mode
ppc0: <Parallel port> on puc0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/12 bytes threshold
ppbus0: <Parallel port bus> on ppc0
plip0: <PLIP network interface> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
atapci1: <Promise PDC20268 UDMA100 controller> port 
0xe000-0xe00f,0xdc00-0xdc03,0xd800-0xd807,0xd400-0xd403,0xd000-0xd007 mem 
0xe3000000-0xe3003fff irq 11 at device 11.0 on pci0
atapci1: [MPSAFE]
ata2: at 0xd000 on atapci1
ata2: [MPSAFE]
ata3: at 0xd800 on atapci1
ata3: [MPSAFE]
dc0: <ADMtek AN985 10/100BaseTX> port 0xe400-0xe4ff mem 0xe3008000-0xe30083ff 
irq 10 at device 12.0 on pci0
dc0: Ethernet address: 00:03:6d:1d:fa:e6
miibus0: <MII bus> on dc0
ukphy0: <Generic IEEE 802.3u media interface> on miibus0
ukphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
ahc0: <Adaptec 2930CU SCSI adapter> port 0xe800-0xe8ff mem 
0xe3009000-0xe3009fff irq 11 at device 13.0 on pci0
aic7860: Ultra Single Channel A, SCSI Id=7, 3/253 SCBs
fdc0: <Enhanced floppy controller (i82077, NE72065 or clone)> port 
0x3f7,0x3f0-0x3f5 irq 6 drq 2 on acpi0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
sio0 port 0x3f8-0x3ff irq 4 on acpi0
sio0: type 16550A
sio1 port 0x2e8-0x2ef irq 3 on acpi0
sio1: type 16550A
ppc1 port 0x378-0x37f irq 7 on acpi0
ppc1: Generic chipset (EPP/NIBBLE) in COMPATIBLE mode
ppbus1: <Parallel port bus> on ppc1
ppbus1: IEEE1284 device found /NIBBLE/ECP
Probing for PnP devices on ppbus1:
ppbus1: <Hewlett-Packard OfficeJet G85> MLC,PCL,PML,SCL
plip1: <PLIP network interface> on ppbus1
lpt1: <Printer> on ppbus1
lpt1: Interrupt-driven port
ppi1: <Parallel I/O> on ppbus1
atkbdc0: <Keyboard controller (i8042)> port 0x64,0x60 irq 1 on acpi0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model IntelliMouse Explorer, device ID 4
orm0: <Option ROMs> at iomem 0xd3000-0xd37ff,0xd0000-0xd27ff on isa0
pmtimer0 on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounter "TSC" frequency 1002281268 Hz quality 800
Timecounters tick every 10.000 msec
acpi_cpu: throttling enabled, 2 steps (100% to 50.0%), currently 100.0%
GEOM: create disk ad0 dp=0xc6987d60
ad0: 19092MB <WDC WD200BB-00AUA1> [38792/16/63] at ata0-master UDMA100
acd0: CDRW <OPTORITE CD-RW CW4802> at ata1-master PIO4
GEOM: create disk ad4 dp=0xc6988060
ad4: 95396MB <WDC WD1000BB-00CJA1> [193821/16/63] at ata2-master UDMA100
Waiting 3 seconds for SCSI devices to settle
umass0: SanDisk Corporation ImageMate CompactFlash USB, rev 1.10/0.09, addr 2
umass0: SCSI over Bulk-Only; quirks = 0x0000
umass0: Get Max Lun not supported (STALLED)
umass0:5:0:-1: Attached to scbus5
GEOM: create disk cd0 dp=0xc695d600
GEOM: create disk da0 dp=0xc6b59850
sa0 at ahc0 bus 0 target 4 lun 0
sa0: <EXABYTE EXB-8505SMBANSH2 0793> Removable Sequential Access SCSI-2 device 
sa0: 5.000MB/s transfers (5.000MHz, offset 11)
sa1 at ahc0 bus 0 target 5 lun 0
sa1: <EXABYTE EXB-8505SMBANSH2 0793> Removable Sequential Access SCSI-2 device 
sa1: 5.000MB/s transfers (5.000MHz, offset 11)
cd0 at ata1 bus 0 target 0 lun 0
cd0: <OPTORITE CD-RW CW4802 120E> Removable CD-ROM SCSI-0 device 
cd0: 16.000MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not present
da0 at umass-sim0 bus 0 target 0 lun 0
da0: <SanDisk ImageMate II 1.30> Removable Direct Access SCSI-2 device 
da0: 1.000MB/s transfers
da0: Attempt to query device size failed: NOT READY, Medium not present
(da0:umass-sim0:0:0:0): READ CAPACITY. CDB: 25 0 0 0 0 0 0 0 0 0 
(da0:umass-sim0:0:0:0): CAM Status: SCSI Status Error
(da0:umass-sim0:0:0:0): SCSI Status: Check Condition
(da0:umass-sim0:0:0:0): NOT READY asc:3a,0
(da0:umass-sim0:0:0:0): Medium not present
(da0:umass-sim0:0:0:0): Unretryable error
Opened disk da0 -> 6
ch0 at ahc0 bus 0 target 3 lun 0
ch0: <EXABYTE EXB-210 3.11> Removable Changer SCSI-2 device 
ch0: 3.300MB/s transfers
ch0: 11 slots, 2 drives, 1 picker, 0 portals
(da0:umass-sim0:0:0:0): READ CAPACITY. CDB: 25 0 0 0 0 0 0 0 0 0 
(da0:umass-sim0:0:0:0): CAM Status: SCSI Status Error
(da0:umass-sim0:0:0:0): SCSI Status: Check Condition
(da0:umass-sim0:0:0:0): NOT READY asc:3a,0
(da0:umass-sim0:0:0:0): Medium not present
(da0:umass-sim0:0:0:0): Unretryable error
Opened disk da0 -> 6
Mounting root from ufs:/dev/ad0s2a
WARNING: / was not properly dismounted
WARNING: /usr was not properly dismounted
WARNING: /disk2 was not properly dismounted