>Submitter-Id: current-users
>Originator: Duane Whitty
>Organization:
>Confidential: no
>Synopsis: lock order reversal
>Severity: serious
>Priority: medium
>Category: kern
>Class: sw-bug
>Release: FreeBSD 6.2-PRERELEASE i386
>Environment:
System: FreeBSD dwpc.dwlabs.ca 6.2-PRERELEASE FreeBSD 6.2-PRERELEASE #1: Tue
Sep 12 00:24:56 ADT 2006 [EMAIL PROTECTED]:/usr/obj/usr/src/sys/DWPC-KERNEL i386
Kernel configration
machine i386
cpu I686_CPU
ident DWPC-200609101954
# To statically compile in device wiring instead of /boot/device.hints
makeoptions DEBUG=-g # Build kernel with gdb(1) debug symbols
options KDB
options KDB_TRACE
options KDB_UNATTENDED
options DDB
options INVARIANT_SUPPORT
options INVARIANTS
options WITNESS
options SCHED_ULE # ULE scheduler
options PREEMPTION # Enable kernel thread preemption
options INET # InterNETworking
options NETGRAPH
options ALTQ_CBQ # Class Bases Queueing
options ALTQ_RED # Random Early Detection
options ALTQ_RIO # RED In/Out
options ALTQ_HFSC # Hierarchical Packet Scheduler
options ALTQ_CDNR # Traffic conditioner
options ALTQ_PRIQ # Priority Queueing
options ALTQ_DEBUG
options MAC # Framework for Mandatory Access Control
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 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 PSEUDOFS)
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
extensions
options KBD_INSTALL_CDEV # install a CDEV entry in /dev
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 ADAPTIVE_GIANT # Giant mutex is adaptive.
device apic # I/O APIC
# Bus support.
device pci
# Floppy drives
# ATA and ATAPI devices
device ata
device atapicam #ATAPI CAM interface for CDs and DVDs etc
device atadisk # ATA disk drives
device atapicd # ATAPI CDROM drives
options ATA_STATIC_ID # Static device numbering
# SCSI Controllers
# SCSI peripherals
device scbus # SCSI bus (required for SCSI)
device da # Direct Access (disks)
device cd # CD
device pass # Passthrough device (direct SCSI access)
# RAID controllers interfaced to the SCSI subsystem
# RAID controllers
# 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
# Enable this for the pcvt (VT220 compatible) console driver
device agp # support several AGP chipsets
# Power management support (see NOTES for more options)
#device apm
# Add suspend/resume support for the i8254.
device pmtimer
# PCCARD (PCMCIA) support
# PCMCIA and cardbus bridge support
# 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 ppi # Parallel port interface device
# If you've got a "dumb" serial or parallel PCI card that is
# supported by the puc(4) glue driver, uncomment the following
# line to enable it (connects to the sio and/or ppc drivers):
# PCI Ethernet NICs.
# 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)
# ISA Ethernet NICs. pccard NICs included.
# 'device ed' requires 'device miibus'
# ISA devices that use the old ISA shims
# Wireless NIC cards
# Pseudo devices.
device loop # Network loopback
device random # Entropy device
device ether # Ethernet support
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' 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 ehci # EHCI PCI->USB interface (USB 2.0)
device usb # USB Bus (required)
device ugen # Generic
device uhid # "Human Interface Devices"
device ukbd # Keyboard
device umass # Disks/Mass storage - Requires scbus and da
device ums # Mouse
# USB Ethernet, requires miibus
device aue # ADMtek USB Ethernet
# FireWire support
>Description:
lock order reversal:
1st 0xc06c6a40 cdev (cdev) @ /usr/src/sys/kern/kern_conf.c:61
2nd 0xc3281718 sleep mtxpool (sleep mtxpool) @
/usr/src/sys/kern/kern_prot.c:1877
KDB: stack backtrace:
kdb_backtrace(0,ffffffff,c06d77c8,c06d6f58,c06a1b04,...) at kdb_backtrace+0x29
witness_checkorder(c3281718,9,c0668211,755) at witness_checkorder+0x578
_mtx_lock_flags(c3281718,0,c0668211,755,c4c32700,...) at _mtx_lock_flags+0x78
crhold(c4a4ca00,deaf593e,deaf58b0,deaf5bf4,deaf5828,...) at crhold+0x1b
make_dev_credv(c06a79c0,0,c4a4ca00,0,0,...) at make_dev_credv+0xc6
make_dev_cred(c06a79c0,0,c4a4ca00,0,0,...) at make_dev_cred+0x21
pty_clone(0,c4a4ca00,deaf593e,5,deaf58b0,c329638c,0,c0660f31,212) at
pty_clone+0xee
devfs_lookupx(deaf59d0,c349ce10,c0660f31,23f,c069a300,...) at
devfs_lookupx+0x2bc
devfs_lookup(deaf59d0) at devfs_lookup+0x2d
VOP_LOOKUP_APV(c069a300,deaf59d0) at VOP_LOOKUP_APV+0x87
lookup(deaf5bcc) at lookup+0x47a
namei(deaf5bcc) at namei+0x376
vn_open_cred(deaf5bcc,deaf5ccc,0,c4a4ca00,c,...) at vn_open_cred+0x2a0
vn_open(deaf5bcc,deaf5ccc,0,c) at vn_open+0x1e
kern_open(c55b1190,8197850,0,3,0,...) at kern_open+0xb6
open(c55b1190,deaf5d04) at open+0x1a
syscall(805003b,810003b,bfbf003b,805c000,0,...) at syscall+0x22f
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (5, FreeBSD ELF32, open), eip = 0x2940c4f3, esp = 0xbfbfd3cc, ebp =
0xbfbfd3f8 ---
>How-To-Repeat: Unknown
>Fix:
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