5.4-RC3 hung - DDB trace/ps provided [was 5.4-RC1 Freezing, butpingable (may be related to gvinum)

[Ash]

Ever since installing 5.4 on this machine, it has been frequently 
locking up. This machine was running 5.3-RELEASE for several months 
without exhibiting similar symptoms.

The machine becomes unresponsive to console and TCP connections (ssh), 
however remains pingable.

This last time I left it alone for several (15-20) minutes after 
breaking to DDB to get a trace and it actually came back to life. This 
behavior is different than what I experienced with 5.4-Beta1 and 
5.4-RC2, where it would hang for an indefinite period of time (i.e hours 
before I would reboot).

I've included copies of ddb's ps output and a dmesg as attachments. Here 
is a trace (pid 95 is bufdaemon):

Tracing pid 95 tid 100106 td 0xc353d900
kdb_enter(c08aaebc,1f960,40,c353d900,c35cb800) at kdb_enter+0x30
siointr1(c35cb800,c369f5c0,e68dbc30,e68dbc18,c081ee1e) at siointr1+0xd1
siointr(c35cb800,c38ac710,e68dbc14,4,c353d900) at siointr+0x42
intr_execute_handlers(c3477490,e68dbc30,e68dbc7c,c081b763,34) at 
intr_execute_handlers+0x85
lapic_handle_intr(34) at lapic_handle_intr+0x3b
Xapic_isr1() at Xapic_isr1+0x33
--- interrupt, eip = 0xc07b98b2, esp = 0xe68dbc74, ebp = 0xe68dbc7c ---
ufs_lock(e68dbc98,c0655966,e68dbcbc,10,100500) at ufs_lock
vn_lock(c39f0318,12,c353d900,c353d900,c0954160) at vn_lock+0x151
flushbufqueues(0,c0954160,44,c0899fe6,a) at flushbufqueues+0x33e
buf_daemon(0,e68dbd48,0,0,0) at buf_daemon+0x13a
fork_exit(c06b1e59,0,e68dbd48) at fork_exit+0x7f
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xe68dbd7c, ebp = 0 ---


Thanks in advance,
-Ash
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Copyright (c) 1992-2005 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 5.4-RC3 #0: Mon Apr 18 10:30:24 CDT 2005
    root at golem.anhedonia.com:/usr/obj/usr/src/sys/GOLEM
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(TM) CPU 2.66GHz (2657.83-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf25  Stepping = 5
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,C
MOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Hyperthreading: 2 logical CPUs
real memory  = 2146959360 (2047 MB)
avail memory = 2095407104 (1998 MB)
ACPI APIC Table: <PTLTD          APIC  >
ioapic0 <Version 2.0> irqs 0-23 on motherboard
ioapic1 <Version 2.0> irqs 24-47 on motherboard
ioapic2 <Version 2.0> irqs 48-71 on motherboard
npx0: <math processor> on motherboard
npx0: INT 16 interface
acpi0: <PTLTD   RSDT> on motherboard
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x1008-0x100b on acpi0
cpu0: <ACPI CPU> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pci0: <unknown> at device 0.1 (no driver attached)
pcib1: <ACPI PCI-PCI bridge> at device 2.0 on pci0
pci1: <ACPI PCI bus> on pcib1
pci1: <base peripheral, interrupt controller> at device 28.0 (no driver attached
)
pcib2: <ACPI PCI-PCI bridge> at device 29.0 on pci1
pci2: <ACPI PCI bus> on pcib2
pcib3: <PCI-PCI bridge> at device 2.0 on pci2
pci3: <PCI bus> on pcib3
em0: <Intel(R) PRO/1000 Network Connection, Version - 1.7.35> port 0x7000-0x703f
 mem 0xfb200000-0xfb21ffff irq 28 at device 4.0 on pci3
em0: Ethernet address: 00:04:23:ad:73:e8
em0:  Speed:N/A  Duplex:N/A
em1: <Intel(R) PRO/1000 Network Connection, Version - 1.7.35> port 0x7040-0x707f
 mem 0xfb220000-0xfb23ffff irq 29 at device 4.1 on pci3
em1: Ethernet address: 00:04:23:ad:73:e9
em1:  Speed:N/A  Duplex:N/A
em2: <Intel(R) PRO/1000 Network Connection, Version - 1.7.35> port 0x7080-0x70bf
 mem 0xfb240000-0xfb25ffff irq 30 at device 6.0 on pci3
em2: Ethernet address: 00:04:23:ad:73:ea
em2:  Speed:N/A  Duplex:N/A
em3: <Intel(R) PRO/1000 Network Connection, Version - 1.7.35> port 0x70c0-0x70ff
 mem 0xfb260000-0xfb27ffff irq 31 at device 6.1 on pci3
em3: Ethernet address: 00:04:23:ad:73:eb
em3:  Speed:N/A  Duplex:N/A
pci1: <base peripheral, interrupt controller> at device 30.0 (no driver attached
)
pcib4: <ACPI PCI-PCI bridge> at device 31.0 on pci1
pci4: <ACPI PCI bus> on pcib4
3ware device driver for 9000 series storage controllers, version: 2.50.02.012
twa0: <3ware 9000 series Storage Controller> port 0x8000-0x80ff mem 0xfd800000-0
xfdffffff,0xfb300000-0xfb3000ff irq 48 at device 1.0 on pci4
twa0: WARNING: (0x04: 0x0042): Error during read of primary DCB: port=4, error=0
x208
twa0: WARNING: (0x04: 0x0042): Error during read of primary DCB: port=1, error=0
x208
twa0: 8 ports, Firmware FE9X 2.04.00.005, BIOS BE9X 2.03.01.047
pci0: <unknown> at device 2.1 (no driver attached)
pcib5: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci5: <ACPI PCI bus> on pcib5
pci5: <display, VGA> at device 3.0 (no driver attached)
fxp0: <Intel 82550 Pro/100 Ethernet> port 0x9400-0x943f mem 0xfb400000-0xfb41fff
f,0xfb441000-0xfb441fff irq 20 at device 4.0 on pci5
miibus0: <MII bus> on fxp0
inphy0: <i82555 10/100 media interface> on miibus0
inphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
fxp0: Ethernet address: 00:0e:0c:4e:02:5e
em4: <Intel(R) PRO/1000 Network Connection, Version - 1.7.35> port 0x9440-0x947f
 mem 0xfb420000-0xfb43ffff irq 23 at device 5.0 on pci5
em4: Ethernet address: 00:0e:0c:4e:01:03
em4:  Speed:N/A  Duplex:N/A
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel ICH3 UDMA100 controller> port 0x6c60-0x6c6f,0x376,0x170-0x177,0x
3f6,0x1f0-0x1f7 at device 31.1 on pci0
ata0: channel #0 on atapci0
ata1: channel #1 on atapci0
pci0: <serial bus, SMBus> at device 31.3 (no driver attached)
acpi_button0: <Power Button> on acpi0
atkbdc0: <Keyboard controller (i8042)> port 0x64,0x60 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
sio0: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
sio0: type 16550A, console
sio1: <16550A-compatible COM port> port 0x2f8-0x2ff irq 3 on acpi0
sio1: type 16550A
ppc0: <ECP parallel printer port> port 0x778-0x77b,0x378-0x37f irq 7 drq 3 on ac
pi0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/9 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 0xe3000-0xe3fff,0xc8000-0xc97ff,0xc0000-0xc7fff
 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 2657825096 Hz quality 800
Timecounters tick every 10.000 msec
acd0: CDROM <SR244W/T01A> at ata0-master PIO4
da0 at twa0 bus 0 target 0 lun 0
da0: <3ware Logical Disk 00 1.00> Fixed Direct Access SCSI-0 device 
da0: 100.000MB/s transfers
da0: 76283MB (156227584 512 byte sectors: 255H 63S/T 9724C)
da1 at twa0 bus 0 target 1 lun 0
da1: <3ware Logical Disk 01 1.00> Fixed Direct Access SCSI-0 device 
da1: 100.000MB/s transfers
da1: 953632MB (1953038336 512 byte sectors: 255H 63S/T 121571C)
Mounting root from ufs:/dev/da0s1