7.0 RELEASE panic: zero vnode ref count (with VFS_BIO_DEBUG on)
Cheng Jin
chengjin at fastsoft.com
Thu Jun 18 04:57:26 UTC 2009
All,
While I was testing various kernel debug options, I ran into the kernel panic. I am not
much of filesystem/vm person. I also didn't find any recent report of a similar crash so I
am hoping one of you would provide some pointers on what this is.
I am running 7.0 Release on a Dell 860 with a WD 80G SATA disk using the following kernel
config file. I do have a few other debug option turned on, but as far as fs is concerned,
VFS_BIO_DEBUG is the only thing.
I do have the core file (about 181 MB) so if anyone needs additional information, please let me
know.
cpu HAMMER
ident NOFP
options IPFIREWALL
options DUMMYNET
options IPFIREWALL_DEFAULT_TO_ACCEPT
options KDB
options KDB_TRACE
options KDB_UNATTENDED
options GDB
options DDB
options INVARIANTS
options INVARIANT_SUPPORT
options WITNESS
options WITNESS_KDB
options VFS_BIO_DEBUG
options HZ=1000
makeoptions DEBUG=-g # Build kernel with gdb(1) debug symbols
options SCHED_ULE # ULE scheduler
options PREEMPTION # Enable kernel thread preemption
options INET # InterNETworking
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 UFS_GJOURNAL # Enable gjournal-based UFS journaling
options MD_ROOT # MD is a potential root device
options CD9660 # ISO 9660 Filesystem
options PROCFS # Process filesystem (requires PSEUDOFS)
options PSEUDOFS # Pseudo-filesystem framework
options GEOM_PART_GPT # GUID Partition Tables.
options GEOM_LABEL # Provides labelization
options COMPAT_43TTY # BSD 4.3 TTY compat [KEEP THIS!]
options COMPAT_IA32 # Compatible with i386 binaries
options COMPAT_FREEBSD4 # Compatible with FreeBSD4
options COMPAT_FREEBSD5 # Compatible with FreeBSD5
options COMPAT_FREEBSD6 # Compatible with FreeBSD6
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 ADAPTIVE_GIANT # Giant mutex is adaptive.
options STOP_NMI # Stop CPUS using NMI instead of IPI
options AUDIT # Security event auditing
# Make an SMP-capable kernel by default
options SMP # Symmetric MultiProcessor Kernel
# Bus support.
device acpi
device pci
# Floppy drives
#device fdc
# ATA and ATAPI devices
device ata
device atadisk # ATA disk drives
device ataraid # ATA RAID drives
device atapicd # ATAPI CDROM drives
#device atapifd # ATAPI floppy drives
#device atapist # ATAPI tape drives
options ATA_STATIC_ID # Static device numbering
# SCSI Controllers
device ahc # AHA2940 and onboard AIC7xxx devices
options AHC_REG_PRETTY_PRINT # Print register bitfields in debug
# output. Adds ~128k to driver.
device ahd # AHA39320/29320 and onboard AIC79xx devices
options AHD_REG_PRETTY_PRINT # Print register bitfields in debug
# output. Adds ~215k to driver.
device amd # AMD 53C974 (Tekram DC-390(T))
device hptiop # Highpoint RocketRaid 3xxx series
device isp # Qlogic family
device mpt # LSI-Logic MPT-Fusion
device sym # NCR/Symbios Logic (newer chipsets + those of `ncr')
device trm # Tekram DC395U/UW/F DC315U adapters
device adv # Advansys SCSI adapters
device adw # Advansys wide SCSI adapters
device aic # Adaptec 15[012]x SCSI adapters, AIC-6[23]60.
device bt # Buslogic/Mylex MultiMaster SCSI adapters
# SCSI peripherals
device scbus # SCSI bus (required for SCSI)
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)
device ses # SCSI Environmental Services (and SAF-TE)
# RAID controllers interfaced to the SCSI subsystem
device amr # AMI MegaRAID
device arcmsr # Areca SATA II RAID
device ciss # Compaq Smart RAID 5*
device dpt # DPT Smartcache III, IV - See NOTES for options
device hptmv # Highpoint RocketRAID 182x
device hptrr # Highpoint RocketRAID 17xx, 22xx, 23xx, 25xx
device iir # Intel Integrated RAID
device ips # IBM (Adaptec) ServeRAID
device mly # Mylex AcceleRAID/eXtremeRAID
device twa # 3ware 9000 series PATA/SATA RAID
# RAID controllers
device aac # Adaptec FSA RAID
device aacp # SCSI passthrough for aac (requires CAM)
device ida # Compaq Smart RAID
device mfi # LSI MegaRAID SAS
device mlx # Mylex DAC960 family
device twe # 3ware ATA RAID
# 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 kbdmux # keyboard multiplexer
device vga # VGA video card driver
device splash # Splash screen and screen saver support
# syscons is the default console driver, resembling an SCO console
device sc
# IPMI support
device ipmi
# Serial (COM) ports
device sio # 8250, 16[45]50 based serial ports
# Parallel port
device ppbus # Parallel port bus (required)
# 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 bce # Broadcom BCM5706/BCM5708 Gigabit Ethernet
device bge # Broadcom BCM570xx Gigabit Ethernet
# Pseudo devices.
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 firmware # firmware assist module
device if_bridge #Bridge interface
# The `bpf' device enables the Berkeley Packet Filter.
# Be aware of the administrative consequences of enabling this!
# Note that 'bpf' is required for DHCP.
device bpf # Berkeley packet filter
# USB support
device uhci # UHCI PCI->USB interface
device ohci # OHCI PCI->USB interface
device ehci # EHCI PCI->USB interface (USB 2.0)
device usb # USB Bus (required)
device ugen # Generic
device ukbd # Keyboard
The backtrace of the stack is the following:
#0 doadump () at pcpu.h:194
194 __asm __volatile("movq %%gs:0,%0" : "=r" (td));
(kgdb) bt
#0 doadump () at pcpu.h:194
#1 0xffffffff80351af5 in boot (howto=260) at ../../../kern/kern_shutdown.c:409
#2 0xffffffff80351f77 in panic (fmt=Variable "fmt" is not available.) at ../../../kern/kern_shutdown.c:563
#3 0xffffffff803baa00 in bufdone_finish (bp=0xffffffffa0209b00) at ../../../kern/vfs_bio.c:3202
#4 0xffffffff803baaa8 in bufdone (bp=0xffffffffa0209b00) at ../../../kern/vfs_bio.c:3173
#5 0xffffffff8030a2b1 in g_io_schedule_up (tp=Variable "tp" is not available.) at ../../../geom/geom_io.c:587
#6 0xffffffff8030a99f in g_up_procbody () at ../../../geom/geom_kern.c:95
#7 0xffffffff80334dca in fork_exit (callout=0xffffffff8030a930 <g_up_procbody>, arg=0x0,
frame=0xffffffffab9fdc80) at ../../../kern/kern_fork.c:781
#8 0xffffffff804ee63e in fork_trampoline () at ../../../amd64/amd64/exception.S:415
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