Kernel Panic "possible cause: unlocking an unlocked mutex or spinlock"

I'm not sure what's happening, but since I applied the 10.6.4 (combo) update to my new MacBook Pro (i5) laptop, I've been getting one or more Kernel Panics per day. Here's a report...anyone have a clue what might be causing this?

Thanks for any ideas...

Don

-------- Start Kernel Panic Report --------
Interval Since Last Panic Report: 247171 sec
Panics Since Last Report: 2
Anonymous UUID: 2A4A17A3-F464-44F4-8F8E-53FB731AF601

*Fri Jul 30 08:27:47 2010*
*panic(cpu 3 caller 0x2269f0): "thread_invoke: preemption_level -1, possible cause: unlocking an unlocked mutex or spinlock"@/SourceCache/xnu/xnu-1504.7.4/osfmk/kern/sched_prim.c:1476*
Backtrace (CPU 3), Frame : Return Address (4 potential args on stack)
0x7a7fbc08 : 0x21b455 (0x5cf328 0x7a7fbc3c 0x2238b1 0x0)
0x7a7fbc58 : 0x2269f0 (0x58712c 0xffffffff 0x5870c4 0x2263b2)
0x7a7fbcd8 : 0x2270f6 (0xcac87c4 0x25a84c8c 0xff01010a 0x6)
0x7a7fbd48 : 0x227184 (0x486bac 0x0 0x0 0x2a1591)
0x7a7fbd68 : 0x4869b4 (0x486bac 0xc28f698 0x7a7fbd88 0x2a1591)
0x7a7fbdd8 : 0x493ae2 (0x0 0x0 0x493d76 0x0)
0x7a7fbed8 : 0x49433f (0x0 0x1 0xc709ff0 0x0)
0x7a7fbf78 : 0x4edaf8 (0xebc82a0 0xc71a9a8 0xc709fc4 0x1)
0x7a7fbfc8 : 0x29f43d (0xc71a9a4 0x0 0x10 0xc71a9a4)

BSD process name corresponding to current thread: CIJScannerRegist

Mac OS version:
10F569

Kernel version:
Darwin Kernel Version 10.4.0: Fri Apr 23 18:28:53 PDT 2010; root:xnu-1504.7.4~1/RELEASE_I386
System model name: MacBookPro6,2 (Mac-F22586C8)

System uptime in nanoseconds: 1152933088980
unloaded kexts:
com.apple.driver.AppleFileSystemDriver 2.0 (addr 0x8176d000, size 0x12288) - last unloaded 116102886228
loaded kexts:
com.cisco.nke.ipsec 2.0.1
org.virtualbox.kext.VBoxNetAdp 3.2.6
org.virtualbox.kext.VBoxNetFlt 3.2.6
org.virtualbox.kext.VBoxUSB 3.2.6
org.virtualbox.kext.VBoxDrv 3.2.6
foo.tun 1.0
foo.tap 1.0
com.vmware.kext.vmnet 3.0.0
com.vmware.kext.vmioplug 3.0.0
com.vmware.kext.vmci 3.0.0
com.vmware.kext.vmx86 3.0.0
com.vara.driver.VaraAudio 1.0.2
com.AmbrosiaSW.AudioSupport 3.2
at.obdev.nke.LittleSnitch 2.2.05
com.apple.driver.AppleHWSensor 1.9.3d0 - last loaded 52113460119
com.apple.filesystems.autofs 2.1.0
com.apple.driver.AGPM 100.12.12
com.apple.driver.AudioAUUC 1.4
com.apple.DontSteal_Mac_OSX 7.0.0
com.apple.iokit.CHUDUtils 201
com.apple.iokit.CHUDProf 216
com.apple.driver.AppleMikeyHIDDriver 1.2.0
com.apple.driver.AppleMikeyDriver 1.8.7f1
com.apple.driver.AppleIntelHDGraphics 6.1.6
com.apple.driver.AudioIPCDriver 1.1.2
com.apple.driver.AppleHDA 1.8.7f1
com.apple.driver.AppleUpstreamUserClient 3.3.2
com.apple.driver.SMCMotionSensor 3.0.0d4
com.apple.driver.AppleIntelHDGraphicsFB 6.1.6
com.apple.iokit.AppleBCM5701Ethernet 2.3.8b2
com.apple.kext.AppleSMCLMU 1.5.0d3
com.apple.driver.AppleGraphicsControl 2.8.63
com.apple.GeForce 6.1.6
com.apple.driver.AirPortBrcm43224 425.16.2
com.apple.driver.ACPISMCPlatformPlugin 4.1.2b1
com.apple.driver.AppleLPC 1.4.12
com.apple.driver.AppleUSBTCButtons 1.8.1b1
com.apple.driver.AppleUSBCardReader 2.5.4
com.apple.driver.AppleIRController 303.8
com.apple.driver.AppleUSBTCKeyboard 1.8.1b1
com.apple.iokit.SCSITaskUserClient 2.6.5
com.apple.BootCache 31
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.iokit.IOAHCIBlockStorage 1.6.2
com.apple.driver.AppleUSBHub 4.0.0
com.apple.driver.AppleFWOHCI 4.7.1
com.apple.driver.AppleUSBEHCI 4.0.2
com.apple.driver.AppleEFINVRAM 1.3.0
com.apple.driver.AppleSmartBatteryManager 160.0.0
com.apple.driver.AppleUSBUHCI 4.0.2
com.apple.driver.AppleAHCIPort 2.1.2
com.apple.driver.AppleACPIButtons 1.3.2
com.apple.driver.AppleRTC 1.3.1
com.apple.driver.AppleHPET 1.5
com.apple.driver.AppleSMBIOS 1.6
com.apple.driver.AppleACPIEC 1.3.2
com.apple.driver.AppleAPIC 1.4
com.apple.driver.AppleIntelCPUPowerManagementClient 105.10.0
com.apple.security.sandbox 0
com.apple.security.quarantine 0
com.apple.nke.applicationfirewall 2.1.11
com.apple.driver.AppleIntelCPUPowerManagement 105.10.0
com.apple.driver.AppleProfileReadCounterAction 17
com.apple.driver.AppleProfileTimestampAction 10
com.apple.driver.AppleProfileThreadInfoAction 14
com.apple.driver.AppleProfileRegisterStateAction 10
com.apple.driver.AppleProfileKEventAction 10
com.apple.driver.AppleProfileCallstackAction 20
com.apple.iokit.IOSurface 74.0
com.apple.iokit.IOBluetoothSerialManager 2.3.7f1
com.apple.iokit.CHUDKernLib 208
com.apple.driver.DspFuncLib 1.8.7f1
com.apple.driver.AppleSMBusController 1.0.8d0
com.apple.iokit.IOSerialFamily 10.0.3
com.apple.iokit.IOFireWireIP 2.0.3
com.apple.iokit.AppleProfileFamily 41
com.apple.driver.AppleHDAController 1.8.7f1
com.apple.iokit.IOHDAFamily 1.8.7f1
com.apple.iokit.IOAudioFamily 1.7.6fc2
com.apple.kext.OSvKernDSPLib 1.3
com.apple.iokit.IO80211Family 311.1
com.apple.iokit.IONetworkingFamily 1.9
com.apple.driver.AppleSMC 3.0.1d2
com.apple.driver.IOPlatformPluginFamily 4.1.2b1
com.apple.driver.AppleSMBusPCI 1.0.8d0
com.apple.nvidia.nv50hal 6.1.6
com.apple.NVDAResman 6.1.6
com.apple.iokit.IONDRVSupport 2.1
com.apple.iokit.IOGraphicsFamily 2.1
com.apple.driver.BroadcomUSBBluetoothHCIController 2.3.7f1
com.apple.driver.AppleUSBBluetoothHCIController 2.3.7f1
com.apple.iokit.IOBluetoothFamily 2.3.7f1
com.apple.iokit.IOUSBMassStorageClass 2.6.1
com.apple.iokit.IOSCSIBlockCommandsDevice 2.6.5
com.apple.driver.AppleUSBMultitouch 205.32
com.apple.iokit.IOUSBHIDDriver 4.0.2
com.apple.driver.AppleUSBMergeNub 4.0.0
com.apple.driver.AppleUSBComposite 3.9.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.6.5
com.apple.iokit.IOBDStorageFamily 1.6
com.apple.iokit.IODVDStorageFamily 1.6
com.apple.iokit.IOCDStorageFamily 1.6
com.apple.driver.XsanFilter 402.1
com.apple.iokit.IOAHCISerialATAPI 1.2.4
com.apple.iokit.IOSCSIArchitectureModelFamily 2.6.5
com.apple.iokit.IOUSBUserClient 4.0.0
com.apple.iokit.IOFireWireFamily 4.2.6
com.apple.iokit.IOUSBFamily 4.0.2
com.apple.iokit.IOAHCIFamily 2.0.4
com.apple.driver.AppleEFIRuntime 1.3.0
com.apple.iokit.IOHIDFamily 1.6.5
com.apple.iokit.IOSMBusFamily 1.1
com.apple.security.TMSafetyNet 6
com.apple.kext.AppleMatch 1.0.0d1
com.apple.driver.DiskImages 283
com.apple.iokit.IOStorageFamily 1.6.1
com.apple.driver.AppleACPIPlatform 1.3.2
com.apple.iokit.IOPCIFamily 2.6
com.apple.iokit.IOACPIFamily 1.3.0
Model: MacBookPro6,2, BootROM MBP61.0057.B09, 2 processors, Intel Core i5, 2.53 GHz, 8 GB, SMC 1.58f16
Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 256 MB
Graphics: Intel HD Graphics, Intel HD Graphics, Built-In, 288 MB
Memory Module: global_name
AirPort: spairportwireless_card_type_airportextreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.10.131.16.1)
Bluetooth: Version 2.3.7f1, 2 service, 12 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Network Service: Ethernet, Ethernet, en0
Serial ATA Device: Hitachi HTS545050B9SA02, 465.76 GB
Serial ATA Device: MATSHITADVD-R UJ-898
USB Device: Hub, 0x0424 (SMSC), 0x2514, 0xfd100000
USB Device: Hub, 0x2001, 0xf103, 0xfd130000
USB Device: Dell USB Keyboard, 0x413c (Dell Inc.), 0x2003, 0xfd137000
USB Device: hp color LaserJet 3700, 0x03f0 (Hewlett Packard), 0x0a17, 0xfd135000
USB Device: IR Receiver, 0x05ac (Apple Inc.), 0x8242, 0xfd120000
USB Device: Built-in iSight, 0x05ac (Apple Inc.), 0x8507, 0xfd110000
USB Device: Hub, 0x0424 (SMSC), 0x2514, 0xfa100000
USB Device: Composite Device, 0x413c (Dell Inc.), 0x3010, 0xfa140000
USB Device: Internal Memory Card Reader, 0x05ac (Apple Inc.), 0x8403, 0xfa130000
USB Device: Apple Internal Keyboard / Trackpad, 0x05ac (Apple Inc.), 0x0236, 0xfa120000
USB Device: BRCM2070 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000
USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x8218, 0xfa113000