I suspect that I have a system losing interrupts from the disk. I get
fairly random lock-ups where the system totally freezes and the disk
access LED is on continuously until I power cycle the system.

It's an IBM T30 with an IBM 40 GB disk. The only thing I have noticed
is that the lock-ups only seem to occur when both ATA busses are in
use. Unfortunately, it may simply be that DVD and disk activity at the
same time simply are stressing the system a bit more.

The DVD is using the ATAPICAM device. DMA is enabled on both the disk
and the DVD. APM is in use. No ACPI. Kernel was built on Oct. 31.
(Maybe it's haunted. :-) )

I have DDB in the kernel, but not WITNESS or INVARIANTS. APM is in
use. No ACPI. I will attach my kernel config file and dmesg.

Any suggestions on how to proceed would be appreciated.
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: [EMAIL PROTECTED]                       Phone: +1 510 486-8634

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 #46: Fri Oct 31 10:51:08 PST 2003
    [EMAIL PROTECTED]:/usr/obj/usr/src/sys/IBM-T30-D
Preloaded elf kernel "/boot/kernel/kernel" at 0xc0823000.
Preloaded userconfig_script "/boot/kernel.conf" at 0xc0823278.
Preloaded elf module "/boot/kernel/apm.ko" at 0xc08232c8.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Pentium(R) 4 Mobile CPU 1.80GHz (1798.48-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf24  Stepping = 4
  
Features=0x3febf9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM>
real memory  = 536281088 (511 MB)
avail memory = 511197184 (487 MB)
Pentium Pro MTRR support enabled
npx0: [FAST]
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcibios: BIOS version 2.10
Using $PIR table, 14 entries at 0xc00fdeb0
apm0: <APM BIOS> on motherboard
apm0: found APM BIOS v1.2, connected at v1.2
pcib0: <Host to PCI bridge> at pcibus 0 on motherboard
pci0: <PCI bus> on pcib0
pci_cfgintr: 0:29 INTA BIOS irq 11
pci_cfgintr: 0:29 INTB BIOS irq 11
pci_cfgintr: 0:29 INTC BIOS irq 11
pci_cfgintr: 0:31 INTB BIOS irq 11
pci_cfgintr: 0:31 INTB BIOS irq 11
pci_cfgintr: 0:31 INTB BIOS irq 11
agp0: <Intel 82845 host to AGP bridge> mem 0xe0000000-0xe3ffffff at device 0.0 on pci0
pcib1: <PCIBIOS PCI-PCI bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
pci_cfgintr: 1:0 INTA BIOS irq 11
pci1: <display, VGA> at device 0.0 (no driver attached)
uhci0: <Intel 82801CA/CAM (ICH3) USB controller USB-A> port 0x1800-0x181f irq 11 at 
device 29.0 on pci0
usb0: <Intel 82801CA/CAM (ICH3) USB controller USB-A> on uhci0
usb0: USB revision 1.0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhub1: NEC Corporation USB2.0 Hub Controller, class 9/0, rev 2.00/1.00, addr 2
uhub1: 4 ports with 4 removable, self powered
uhci1: <Intel 82801CA/CAM (ICH3) USB controller USB-B> port 0x1820-0x183f irq 11 at 
device 29.1 on pci0
usb1: <Intel 82801CA/CAM (ICH3) USB controller USB-B> on uhci1
usb1: USB revision 1.0
uhub2: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
uhci2: <Intel 82801CA/CAM (ICH3) USB controller USB-C> port 0x1840-0x185f irq 11 at 
device 29.2 on pci0
usb2: <Intel 82801CA/CAM (ICH3) USB controller USB-C> on uhci2
usb2: USB revision 1.0
uhub3: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub3: 2 ports with 2 removable, self powered
pcib2: <PCIBIOS PCI-PCI bridge> at device 30.0 on pci0
pci2: <PCI bus> on pcib2
pci_cfgintr: 2:0 INTA BIOS irq 11
pci_cfgintr: 2:0 INTB BIOS irq 11
pci_cfgintr: 2:2 INTA BIOS irq 11
pci_cfgintr: 2:8 INTA BIOS irq 11
cbb0: <TI1520 PCI-CardBus Bridge> mem 0x50000000-0x50000fff irq 11 at device 0.0 on 
pci2
start (50000000) < sc->membase (d0200000)
start (50000000) < sc->pmembase (f0000000)
cardbus0: <CardBus bus> on cbb0
pccard0: <16-bit PCCard bus> on cbb0
cbb0: [MPSAFE]
cbb1: <TI1520 PCI-CardBus Bridge> mem 0x51000000-0x51000fff irq 11 at device 0.1 on 
pci2
start (51000000) < sc->membase (d0200000)
start (51000000) < sc->pmembase (f0000000)
cardbus1: <CardBus bus> on cbb1
pccard1: <16-bit PCCard bus> on cbb1
cbb1: [MPSAFE]
pci2: <network> at device 2.0 (no driver attached)
fxp0: <Intel 82801CAM (ICH3) Pro/100 VE Ethernet> port 0x8000-0x803f mem 
0xd0200000-0xd0200fff irq 11 at device 8.0 on pci2
fxp0: Ethernet address 00:09:6b:50:36:29
miibus0: <MII bus> on fxp0
inphy0: <i82562ET 10/100 media interface> on miibus0
inphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
fxp0: [MPSAFE]
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel ICH3 UDMA100 controller> port 
0x1860-0x186f,0x374-0x377,0x170-0x177,0x3f4-0x3f7,0x1f0-0x1f7 at device 31.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata0: [MPSAFE]
ata1: at 0x170 irq 15 on atapci0
ata1: [MPSAFE]
ichsmb0: <Intel 82801CA (ICH3) SMBus controller> port 0x1880-0x189f irq 11 at device 
31.3 on pci0
smbus0: <System Management Bus> on ichsmb0
smb0: <SMBus generic I/O> on smbus0
pcm0: <Intel ICH3 (82801CA)> port 0x18c0-0x18ff,0x1c00-0x1cff irq 11 at device 31.5 on 
pci0
pcm0: <Analog Devices AD1881A AC97 Codec>
pci0: <simple comms> at device 31.6 (no driver attached)
orm0: <Option ROMs> at iomem 
0xe0000-0xeffff,0xdc000-0xdffff,0xd1000-0xd1fff,0xd0000-0xd0fff,0xc0000-0xcffff on isa0
pmtimer0 on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x64,0x60 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
psm0: <PS/2 Mouse> flags 0x2000 irq 12 on atkbdc0
psm0: model Generic PS/2 mouse, device ID 0
fdc0: <Enhanced floppy controller (i82077, NE72065 or clone)> at port 
0x3f7,0x3f0-0x3f5 irq 6 drq 2 on isa0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 16550A
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
unknown: <PNP0303> can't assign resources (port)
unknown: <PNP0c02> can't assign resources (memory)
unknown: <PNP0680> can't assign resources (port)
unknown: <PNP0680> can't assign resources (port)
unknown: <IBM0057> can't assign resources (irq)
unknown: <PNP0501> can't assign resources (port)
unknown: <PNP0700> can't assign resources (port)
Timecounters tick every 10.000 msec
GEOM: create disk ad0 dp=0xc47ca970
ad0: 38154MB <IC25N040ATCS05-0> [77520/16/63] at ata0-master UDMA100
acd0: CDRW <DW-28E> at ata1-master UDMA33
GEOM: create disk cd0 dp=0xc47bce00
cd0 at ata1 bus 0 target 0 lun 0
cd0: <TEAC DW-28E 2.1A> Removable CD-ROM SCSI-0 device 
cd0: 33.000MB/s transfers
cd0: cd present [1559680 x 2048 byte records]
Mounting root from ufs:/dev/ad0s3a
WARNING: / was not properly dismounted
#
# IBM-T30 -- Kernel configuration file for FreeBSD/i386
#
# For more information on this file, please read the handbook section on
# Kernel Configuration Files:
#
#    http://www.FreeBSD.org/handbook/kernelconfig-config.html
#
# The handbook is also available locally in /usr/share/doc/handbook
# if you've installed the doc distribution, otherwise always see the
# FreeBSD World Wide Web server (http://www.FreeBSD.org/) for the
# latest information.
#
# An exhaustive list of options and more detailed explanations of the
# device lines is also present in the ./LINT configuration file. If you are
# in doubt as to the purpose or necessity of a line, check first in LINT.
#
# $FreeBSD: src/sys/i386/conf/GENERIC,v 1.246.2.43 2002/05/23 17:04:01 obrien Exp $

machine         i386
#cpu            I486_CPU
#cpu            I586_CPU
cpu             I686_CPU
ident           IBM-T30-D
maxusers        0

#To statically compile in device wiring instead of /boot/device.hints
#hints          "GENERIC.hints"         #Default places to look for devices.

makeoptions     DEBUG=-g                #Build kernel with gdb(1) debug symbols

options         CPU_SUSP_HLT            # Suspend on halt
options         SCHED_4BSD              #4BSD scheduler
options         INET                    #InterNETworking
options         INET6                   #IPv6 communications protocols
options         FFS                     #Berkeley Fast Filesystem
options         SOFTUPDATES             #Enable FFS soft updates support
options         UFS_ACL                 #Support for access control lists
options         UFS_DIRHASH             #Improve performance on big directories
#options                NFSCLIENT               #Network Filesystem Client
#options                NFSSERVER               #Network Filesystem Server
#options        NFS_ROOT                #NFS usable as root device, requires NFSCLIENT
options         MSDOSFS                 #MSDOS Filesystem
#options                DA_OLD_QUIRKS
options         CD9660                  #ISO 9660 Filesystem
options         PROCFS                  #Process filesystem
options         PSEUDOFS                #Pseudo-filesystem framework
options         COMPAT_43               #Compatible with BSD 4.3 [KEEP THIS!]
options         COMPAT_FREEBSD4         #Compatible with FreeBSD4
options         SCSI_DELAY=5000         #Delay (in ms) before probing SCSI
options         KTRACE                  #ktrace(1) support
options         SYSVSHM                 #SYSV-style shared memory
options         SYSVMSG                 #SYSV-style message queues
options         SYSVSEM                 #SYSV-style semaphores
options         _KPOSIX_PRIORITY_SCHEDULING #Posix P1003_1B real-time extensions
options         KBD_INSTALL_CDEV        # install a CDEV entry in /dev
#options                DISABLE_PSE
#options                DISABLE_PG_G
#options        AHC_REG_PRETTY_PRINT    # Print register bitfields in debug
                                        # output.  Adds ~128k to driver.
#options        AHD_REG_PRETTY_PRINT    # Print register bitfields in debug
                                        # output.  Adds ~215k to driver.
options         CPU_ENABLE_SSE          # For MPlayer and others
options         GEOM_BDE                # Enable encrypted partitions

# Debugging for use in -current
options         DDB                     #Enable the kernel debugger
#options         INVARIANTS              #Enable calls of extra sanity checking
#options         INVARIANT_SUPPORT       #Extra sanity checks of internal structures, 
required by INVARIANTS
#options         WITNESS                 #Enable checks to detect deadlocks and cycles
#options         WITNESS_SKIPSPIN        #Don't run witness on spinlocks for speeed

# To make an SMP kernel, the next two are needed
#options        SMP                     # Symmetric MultiProcessor Kernel
#options        APIC_IO                 # Symmetric (APIC) I/O

device          isa
#device         eisa
device          pci

# Floppy drives
device          fdc

# ATA and ATAPI devices
device          ata
device          atadisk         # ATA disk drives
device          atapicd         # ATAPI CDROM drives
#device         atapifd         # ATAPI floppy drives
#device         atapist         # ATAPI tape drives
device          atapicam        # Emulate ATAPI devices as SCSI ditto via CAM
                                # needs CAM to be present (scbus & pass)
options         ATA_STATIC_ID   #Static device numbering

# SCSI peripherals
device          scbus           # SCSI bus (required)
#device         ch              # SCSI media changers
device          da              # Direct Access (disks)
#device         sa              # Sequential Access (tape etc)
device          cd              # CD
device          pass            # Passthrough device (direct SCSI access)

# atkbdc0 controls both the keyboard and the PS/2 mouse
device          atkbdc               # AT keyboard controller
device          atkbd                # AT keyboard
device          psm                  # PS/2 mouse
#device         psm0    at atkbdc? irq 12 flags 0x2000
options         KBD_RESETDELAY=500

device          vga             # VGA video card driver

device          splash

# syscons is the default console driver, resembling an SCO console
device          sc
options         SC_HISTORY_SIZE=1000

# Enable this and PCVT_FREEBSD for pcvt vt220 compatible console driver
#device         vt
#options        XSERVER                 # support for X server on a vt console
#options        FAT_CURSOR              # start with block cursor

device          agp             # support several AGP chipsets

# Floating point support - do not disable.
device          npx

# Power management support (see LINT for more options)
#device         apm
# Add suspend/resume support for the i8254.
device          pmtimer

# PCCARD (PCMCIA) support
# Pcmcia and cardbus bridge support
device          cbb                     # cardbus (yenta) bridge
#device         pcic                    # ExCA ISA and PCI bridges
device          pccard                  # PC Card (16-bit) bus
device          cardbus                 # CardBus (32-bit) bus

# Serial (COM) ports
device          sio             # 8250, 16[45]50 based serial ports

# Parallel port
#device         ppc
#device         ppbus           # Parallel port bus (required)
#device         lpt             # Printer
#device         plip            # TCP/IP over parallel
#device         ppi             # Parallel port interface device
#device         vpo             # Requires scbus and da

# PCI Ethernet NICs.
#device          de             # DEC/Intel DC21x4x (``Tulip'')
#device          em             # Intel PRO/1000 adapter Gigabit Ethernet Card
#device          txp            # 3Com 3cR990 (``Typhoon'')
#device          vx             # 3Com 3c590, 3c595 (``Vortex'')
                                                                                
# PCI Ethernet NICs that use the common MII bus controller code.
# NOTE: Be sure to keep the 'device miibus' line in order to use these NICs!
device          miibus          # MII bus support
device          fxp             # Intel EtherExpress PRO/100B (82557, 82558)
device          dc              # DEC/Intel 21143 and various workalikes

# ISA Ethernet NICs.
# Xircom Ethernet
device          xe
# WaveLAN/IEEE 802.11 wireless NICs. Note: the WaveLAN/IEEE really
# exists only as a PCMCIA device, so there is no ISA attachment needed
# and resources will always be dynamically assigned by the pccard code.
device          wlan
#device         wi              # Only load this when we want it!

# Pseudo devices - the number indicates how many units to allocate.
device          random                  # Entropy device
device          loop            # Network loopback
device          ether           # Ethernet support
device          ccd             # Concatenated disk support
#device         sl              # Kernel SLIP
#device         ppp             # Kernel PPP
device          tun             # Packet tunnel.
device          pty             # Pseudo-ttys (telnet etc)
device          md              # Memory "disks"
device          gif             # IPv6 and IPv4 tunneling
device          faith           # IPv6-to-IPv4 relaying (translation)

# The `bpf' pseudo-device enables the Berkeley Packet Filter.
# Be aware of the administrative consequences of enabling this!
device          bpf             #Berkeley packet filter

# USB support
device          uhci            # UHCI PCI->USB interface
device          ohci            # OHCI PCI->USB interface
device          usb             # USB Bus (required)
#device         udbp            # USB Double Bulk Pipe devices
device          ugen            # Generic
device          uhid            # "Human Interface Devices"
device          ukbd            # Keyboard
device          ulpt            # Printer
device          umass           # Disks/Mass storage - Requires scbus and da
device          ums             # Mouse
device          urio            # Diamond Rio MP3 Player
device          uscanner        # Scanners
# USB Ethernet, requires mii
device          aue             # ADMtek USB ethernet
device          cue             # CATC USB ethernet
device          kue             # Kawasaki LSI USB ethernet

# Sound support (Required System Management Bus for ICH
device          smbus
device          iicbus
device          iicbb
device          intpm
device          ichsmb
device          smb
device          pcm

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