Hi Bob,
I've seen this happening to a Dell server, that used a SCSI raid. One
disk was with a faillure, and this would lock up the machine. This
faillure however was not logged, because tthe SCSI raid controller
wouldn't send the apropriate signal to FreeBSD, since they were not
compatible. It may be a lot of things, but check for it.

On 8/23/06, Bob Richards <[EMAIL PROTECTED]> wrote:

Every couple of days, one of my Dell Work-Stations running freebsd 6.1 simply
locks up. The box can be pinged only IE there are no services running, locked
up screen/kbd/mouse. No caps-lock light action on kybd...  On/OFF time.
Actually OFF doesn't work either (It's a dell, with ACPI power switch) only
hitting the reset button will revive things.

Machine restarts OK, complains about improperly dismounted drives.... etc.

There is no core file, and the last entries in messages just before the lockup
always look like this:

Aug 23 00:23:02 viola kernel: acd0: WARNING - PREVENT_ALLOW read data overrun
Aug 23 00:24:02 viola kernel: acd0: WARNING - PREVENT_ALLOW read data overrun
Aug 23 00:26:02 viola kernel: acd0: WARNING - READ_TOC read data overrun 18>12
Aug 23 00:28:32 viola kernel: acd0: WARNING - PREVENT_ALLOW read data overrun

There was NO CD in the cdrom drive either,

This has happened with the original GENERIC kernel, and also with the custom
kernel I recently built for that hardware.

dmesg output:

Copyright (c) 1992-2006 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 6.1-RELEASE #0: Tue Aug 22 03:55:24 EDT 2006
    [EMAIL PROTECTED]:/usr/src/sys/i386/compile/VIOLA
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel Pentium III (531.61-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x681  Stepping = 1

real memory  = 267051008 (254 MB)
avail memory = 256045056 (244 MB)
kbd1 at kbdmux0
acpi0: <DELL GX110  > on motherboard
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x808-0x80b on acpi0
cpu0: <ACPI CPU> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
agp0: <Intel 82810E (i810E GMCH) SVGA controller> mem
0xf4000000-0xf7ffffff,0xff000000-0xff07ffff irq 9 at device 1.0 on pci0
pcib1: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci1: <ACPI PCI bus> on pcib1
xl0: <3Com 3c905C-TX Fast Etherlink XL> port 0xec80-0xecff mem
0xfdfffc00-0xfdfffc7f irq 7 at device 12.0 on pci1
miibus0: <MII bus> on xl0
xlphy0: <3c905C 10/100 internal PHY> on miibus0
xlphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
xl0: Ethernet address: 00:c0:4f:09:b1:23
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel ICH UDMA66 controller> port
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xffa0-0xffaf at device 31.1 on pci0
ata0: <ATA channel 0> on atapci0
ata1: <ATA channel 1> on atapci0
uhci0: <Intel 82801AA (ICH) USB controller> port 0xff80-0xff9f irq 11 at
device 31.2 on pci0
usb0: <Intel 82801AA (ICH) USB controller> 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
pci0: <serial bus, SMBus> at device 31.3 (no driver attached)
fdc0: <floppy drive controller> port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on acpi0
fdc0: [FAST]
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model IntelliMouse, device ID 3
sio0: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
sio0: type 16550A
sio1: <16550A-compatible COM port> port 0x2f8-0x2ff irq 3 on acpi0
sio1: type 16550A
ppc0: <ECP parallel printer port> port 0x278-0x27f,0x678-0x67f irq 5 on acpi0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/8 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
orm0: <ISA Option ROMs> at iomem 0xc0000-0xc7fff,0xc8000-0xcffff 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 531611246 Hz quality 800
Timecounters tick every 1.000 msec
ad0: 9765MB <Maxtor 51024U2 DA620CQ0> at ata0-master UDMA66
acd0: CDROM <SAMSUNG SC-140B/d005> at ata1-master PIO4
Trying to mount root from ufs:/dev/ad0s1a


The kernel config file is:

cat VIOLA | grep -v ^#

machine         i386
cpu             I686_CPU
ident           VIOLA
options         SCHED_ULE               # ULE scheduler
options         PREEMPTION              # Enable kernel thread preemption
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
options         MD_ROOT                 # MD is a potential root device
options         NFSCLIENT               # Network Filesystem Client
options         NFSSERVER               # Network Filesystem Server
options         NFS_ROOT                # NFS usable as /, requires NFSCLIENT
options         MSDOSFS                 # MSDOS Filesystem
options         CD9660                  # ISO 9660 Filesystem
options         PROCFS                  # Process filesystem (requires
options         PSEUDOFS                # Pseudo-filesystem framework
options         GEOM_GPT                # GUID Partition Tables.
options         COMPAT_43               # Compatible with BSD 4.3 [KEEP THIS!]
options         COMPAT_FREEBSD4         # Compatible with FreeBSD4
options         COMPAT_FREEBSD5         # Compatible with FreeBSD5
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
options         KBD_INSTALL_CDEV        # install a CDEV entry in /dev
options         AHC_REG_PRETTY_PRINT    # Print register bitfields in debug
options         ADAPTIVE_GIANT          # Giant mutex is adaptive.
device          apic                    # I/O APIC
device          pci
device          fdc
device          ata
device          atadisk         # ATA disk drives
device          atapicd         # ATAPI CDROM drives
device          atapifd         # ATAPI floppy drives
options         ATA_STATIC_ID   # Static device numbering
device          atkbdc          # AT keyboard controller
device          atkbd           # AT keyboard
device          psm             # PS/2 mouse
device          kbdmux          # keyboard multiplexer
device          vga             # VGA video card driver
device          splash          # Splash screen and screen saver support
device          sc
device          agp             # support several AGP chipsets
device          sio             # 8250, 16[45]50 based serial ports
device          ppc
device          ppbus           # Parallel port bus (required)
device          lpt             # Printer
device          plip            # TCP/IP over parallel
device          ppi             # Parallel port interface device
device          miibus          # MII bus support
device          xl              # 3Com 3c90x (``Boomerang'', ``Cyclone'')
device          loop            # Network loopback
device          random          # Entropy device
device          ether           # Ethernet 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)
device          bpf             # Berkeley packet filter
device          uhci            # UHCI PCI->USB interface
device          usb             # USB Bus (required)


The crash happens at intervals of between 1 and 3 days (the machine is never
turned off)

Any ideas where to start poking at this problem?


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