Date: Fri, 15 Sep 2006 19:51:00 -0300 (ADT) From: Duane Whitty <duane@dwlabs.ca> To: FreeBSD-gnats-submit@FreeBSD.org Cc: freebsd-hackers@FreeBSD.org Subject: kern/103307: lock order reversal Message-ID: <200609152251.k8FMp0xg000913@dwpc.dwlabs.ca> Resent-Message-ID: <200609152300.k8FN0YV5009985@freefall.freebsd.org>
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>Number: 103307 >Category: kern >Synopsis: lock order reversal >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Fri Sep 15 23:00:31 GMT 2006 >Closed-Date: >Last-Modified: >Originator: Duane Whitty >Release: FreeBSD 6.2-PRERELEASE i386 >Organization: >Environment: System: FreeBSD dwpc.dwlabs.ca 6.2-PRERELEASE FreeBSD 6.2-PRERELEASE #1: Tue Sep 12 00:24:56 ADT 2006 duane@dwpc.dwlabs.ca:/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: >Release-Note: >Audit-Trail: >Unformatted:
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