5.1-R-p11 unable to "sync disks" when shutting down

[Esa Karkkainen]

For some reason my home PC is occasionally unable to sync to disk when I
run "shutdown -p now". The HW in question is a Shuttle SN45G which has
NVIDIA nForce2 Ultra 400 North bridge and MCP-T South bridge. I've
attached dmesg to this e-mail.

I managed to activate kernel debugger with ctrl-alt-esc, but I was
little bit late so "sync disks" had already given up. Then I ran "panic"
command from debugger so I would have a dump which might help to find
out why this happened.

The only hard disk has four slices. ad0s1 has w2k, ad0s2 has 5.2-BETA,
ad0s3 has 5.1-R-p11 and ad0s4 has /home, /usr/ports and /scratch
filesystems. When installing 5.2-BETA I managed to lose (due to my
error) ad0s3 and ad0s4 disklabels. The ad0s4 (which has only UFS1
filesystems) disklabel was reconstructed by using Niall Smart's "findsb"
and I had a copy of the ad0s3 disklabel at my $HOME dir.
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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-RELEASE-p11 #4: Sat Dec 13 17:28:07 EET 2003
    root at thunderbolt.my.domain:/usr/obj/usr/src/sys/THUNDERBOLT
Preloaded elf kernel "/boot/kernel/kernel" at 0xc0415000.
Preloaded elf module "/boot/kernel/snd_ich.ko" at 0xc0415244.
Preloaded elf module "/boot/kernel/snd_pcm.ko" at 0xc04152f0.
Preloaded elf module "/boot/kernel/acpi.ko" at 0xc041539c.
Timecounter "i8254"  frequency 1193182 Hz
Timecounter "TSC"  frequency 2079560211 Hz
CPU: AMD Athlon(tm) XP 2600+ (2079.56-MHz 686-class CPU)
  Origin = "AuthenticAMD"  Id = 0x681  Stepping = 1
  Features=0x383fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE>
  AMD Features=0xc0400000<AMIE,DSP,3DNow!>
real memory  = 1073676288 (1023 MB)
avail memory = 1038655488 (990 MB)
Pentium Pro MTRR support enabled
npx0: <math processor> on motherboard
npx0: INT 16 interface
acpi0: <XPC    AWRDACPI> on motherboard
pcibios: BIOS version 2.10
Using $PIR table, 5 entries at 0xc00fdf10
acpi0: power button is handled as a fixed feature programming model.
Timecounter "ACPI-fast"  frequency 3579545 Hz
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x4008-0x400b on acpi0
acpi_cpu0: <CPU> on acpi0
acpi_tz0: <thermal zone> on acpi0
acpi_button0: <Power Button> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pci0: <memory, RAM> at device 0.1 (no driver attached)
pci0: <memory, RAM> at device 0.2 (no driver attached)
pci0: <memory, RAM> at device 0.3 (no driver attached)
pci0: <memory, RAM> at device 0.4 (no driver attached)
pci0: <memory, RAM> at device 0.5 (no driver attached)
isab0: <PCI-ISA bridge> at device 1.0 on pci0
isa0: <ISA bus> on isab0
pci0: <serial bus, SMBus> at device 1.1 (no driver attached)
pci0: <serial bus, USB> at device 2.0 (no driver attached)
pci0: <serial bus, USB> at device 2.1 (no driver attached)
pci0: <serial bus, USB> at device 2.2 (no driver attached)
pci0: <network, ethernet> at device 4.0 (no driver attached)
pci0: <multimedia, audio> at device 5.0 (no driver attached)
pcm0: <Nvidia nForce2 AC97 controller> port 0xd800-0xd87f,0xd400-0xd4ff mem 0xe8081000-0xe8081fff irq 5 at device 6.0 on pci0
pcm0: <Avance Logic ALC650 AC97 Codec>
pcib1: <ACPI PCI-PCI bridge> at device 8.0 on pci0
pci1: <ACPI PCI bus> on pcib1
atapci0: <nVidia nForce2 UDMA133 controller> port 0xf000-0xf00f at device 9.0 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
pci0: <serial bus, FireWire> at device 13.0 (no driver attached)
pcib2: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci3: <ACPI PCI bus> on pcib2
pci3: <display, VGA> at device 0.0 (no driver attached)
sio0 port 0x3f8-0x3ff irq 4 on acpi0
sio0: type 16550A
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
pmtimer0 on isa0
orm0: <Option ROMs> at iomem 0xd4000-0xd57ff,0xd0000-0xd3fff on isa0
sc0: <System console> on isa0
sc0: VGA <16 virtual consoles, flags=0x200>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
sio1: configured irq 3 not in bitmap of probed irqs 0
sio1: port may not be enabled
Timecounters tick every 10.000 msec
ad0: 114473MB <ST3120026A> [232581/16/63] at ata0-master UDMA100
acd0: CD-RW <PLEXTOR CD-R PX-320A> at ata1-master WDMA2
Mounting root from ufs:/dev/ad0s3a
WARNING: / was not properly dismounted
nv0: <NVIDIA nForce MCP2 Networking Adapter> port 0xd000-0xd007 mem 0xe8087000-0xe8087fff irq 11 at device 4.0 on pci0
nv0: Ethernet address 00:30:1b:af:7d:cc
miibus0: <MII bus> on nv0
rlphy0: <RTL8201L 10/100 media interface> on miibus0
rlphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
ohci0: <OHCI (generic) USB controller> mem 0xe8080000-0xe8080fff irq 5 at device 2.0 on pci0
usb0: OHCI version 1.0, legacy support
usb0: SMM does not respond, resetting
usb0: <OHCI (generic) USB controller> on ohci0
usb0: USB revision 1.0
uhub0: (0x10de) OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 3 ports with 3 removable, self powered
ohci1: <OHCI (generic) USB controller> mem 0xe8083000-0xe8083fff irq 10 at device 2.1 on pci0
usb1: OHCI version 1.0, legacy support
usb1: SMM does not respond, resetting
usb1: <OHCI (generic) USB controller> on ohci1
usb1: USB revision 1.0
uhub1: (0x10de) OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 3 ports with 3 removable, self powered
ehci0: <EHCI (generic) USB 2.0 controller> mem 0xe8086000-0xe80860ff irq 11 at device 2.2 on pci0
ehci_pci_attach: companion usb0
ehci_pci_attach: companion usb1
usb2: EHCI version 1.0
usb2: companion controllers, 4 ports each: usb0 usb1
usb2: <EHCI (generic) USB 2.0 controller> on ehci0
usb2: USB revision 2.0
uhub2: (0x10de) EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub2: 6 ports with 6 removable, self powered
nvidia0: <GeForce4 Ti 4400> mem 0xd8000000-0xd807ffff,0xd0000000-0xd7ffffff,0xe4000000-0xe4ffffff irq 10 at device 0.0 on pci3
pid 522 (squid), uid 65534: exited on signal 6