your computer restarted because of a problem -- crash -- what's the problem?

My MBP crashed and rebooted this morning (it has also happened to my Air 3 time this morning after upgrading to ML last week). Here is the log from my MBP:

Wed Jan 23 14:34:32 2013

panic(cpu 0 caller 0xffffff8023c156b0): "Spinlock acquisition timed out: lock=0xffffff804db93de8, lock owner thread=0xffffff803cec5550, current_thread: 0xffffff803cec5550, lock owner active on CPU 0x0, current owner: 0xffffff803cec5550"@/SourceCache/xnu/xnu-2050.18.24/osfmk/i386/locks_i386.c:363

Backtrace (CPU 0), Frame : Return Address

0xffffff8116aabd50 : 0xffffff8023c1d626

0xffffff8116aabdc0 : 0xffffff8023c156b0

0xffffff8116aabde0 : 0xffffff8023c20b80

0xffffff8116aabe10 : 0xffffff8023c10448

0xffffff8116aabe60 : 0xffffff8023c20df2

0xffffff8116aabe90 : 0xffffff8023c4f021

0xffffff8116aabed0 : 0xffffff8023c16d00

0xffffff8116aabf20 : 0xffffff8023c19f64

0xffffff8116aabf50 : 0xffffff8023c18c97

0xffffff8116aabf70 : 0xffffff8023ca5b16

0xffffff8116aabfb0 : 0xffffff8023cced53

BSD process name corresponding to current thread: Safari

Mac OS version:

12C60

Kernel version:

Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64

Kernel UUID: 69A5853F-375A-3EF4-9247-478FD0247333

Kernel slide: 0x0000000023a00000

Kernel text base: 0xffffff8023c00000

System model name: MacBookPro10,1 (Mac-C3EC7CD22292981F)

System uptime in nanoseconds: 517560860191836

last loaded kext at 451559287783415: com.apple.driver.AppleThunderboltPCIUpAdapter 1.2.5 (addr 0xffffff7fa60d6000, size 32768)

last unloaded kext at 451658035567552: com.apple.driver.AppleUSBCDC 4.1.22 (addr 0xffffff7fa60d3000, size 12288)

loaded kexts:

org.virtualbox.kext.VBoxNetAdp 4.1.23

org.virtualbox.kext.VBoxNetFlt 4.1.23

org.virtualbox.kext.VBoxUSB 4.1.23

org.virtualbox.kext.VBoxDrv 4.1.23

foo.tun 1.0

foo.tap 1.0

com.rim.driver.BlackBerryUSBDriverInt 0.0.74

com.apple.filesystems.afpfs 10.0

com.apple.nke.asp_tcp 7.0.0

com.apple.filesystems.smbfs 1.8

com.apple.driver.AppleBluetoothMultitouch 75.15

com.apple.driver.AppleHWSensor 1.9.5d0

com.apple.driver.AudioAUUC 1.60

com.apple.iokit.IOBluetoothSerialManager 4.0.9f33

com.apple.filesystems.autofs 3.0

com.apple.driver.AGPM 100.12.69

com.apple.driver.ApplePlatformEnabler 2.0.5d4

com.apple.driver.X86PlatformShim 1.0.0

com.apple.driver.AppleMikeyHIDDriver 122

com.apple.driver.AppleHDA 2.3.1f2

com.apple.driver.AppleMikeyDriver 2.3.1f2

com.apple.driver.AppleSMCLMU 2.0.2d0

com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport 4.0.9f33

com.apple.driver.AppleUSBDisplays 353

com.apple.driver.AppleUpstreamUserClient 3.5.10

com.apple.GeForce 8.0.0

com.apple.driver.AppleSMCPDRC 1.0.0

com.apple.driver.AppleMCCSControl 1.0.33

com.apple.iokit.IOUserEthernet 1.0.0d1

com.apple.driver.AppleLPC 1.6.0

com.apple.driver.AppleMuxControl 3.2.11

com.apple.driver.AppleIntelHD4000Graphics 8.0.0

com.apple.driver.AppleIntelFramebufferCapri 8.0.0

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.driver.ApplePolicyControl 3.2.11

com.apple.driver.AppleUSBTCButtons 235.4

com.apple.driver.AppleUSBTCKeyboard 235.4

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1

com.apple.BootCache 34

com.apple.driver.XsanFilter 404

com.apple.iokit.IOAHCIBlockStorage 2.2.2

com.apple.driver.AppleSDXC 1.2.2

com.apple.driver.AppleUSBHub 5.2.5

com.apple.driver.AirPort.Brcm4331 602.15.22

com.apple.driver.AppleAHCIPort 2.4.1

com.apple.driver.AppleUSBEHCI 5.4.0

com.apple.driver.AppleUSBXHCI 1.4.0

com.apple.driver.AppleEFINVRAM 1.6.1

com.apple.driver.AppleSmartBatteryManager 161.0.0

com.apple.driver.AppleACPIButtons 1.6

com.apple.driver.AppleRTC 1.5

com.apple.driver.AppleHPET 1.7

com.apple.driver.AppleSMBIOS 1.9

com.apple.driver.AppleACPIEC 1.6

com.apple.driver.AppleAPIC 1.6

com.apple.driver.AppleIntelCPUPowerManagementClient 196.0.0

com.apple.nke.applicationfirewall 4.0.39

com.apple.security.quarantine 2

com.apple.driver.AppleIntelCPUPowerManagement 196.0.0

com.apple.driver.AppleThunderboltPCIUpAdapter 1.2.5

com.apple.security.SecureRemotePassword 1.0

com.apple.driver.IOBluetoothHIDDriver 4.0.9f33

com.apple.driver.AppleMultitouchDriver 235.28

com.apple.iokit.IOSerialFamily 10.0.6

com.apple.kext.triggers 1.0

com.apple.driver.DspFuncLib 2.3.1f2

com.apple.driver.X86PlatformPlugin 1.0.0

com.apple.driver.AppleSMBusPCI 1.0.10d0

com.apple.iokit.AppleBluetoothHCIControllerUSBTransport 4.0.9f33

com.apple.driver.AppleUSBAudio 2.9.0f6

com.apple.iokit.IOAudioFamily 1.8.9fc10

com.apple.kext.OSvKernDSPLib 1.6

com.apple.driver.AppleSMBusController 1.0.10d0

com.apple.nvidia.nvGK100hal 8.0.0

com.apple.NVDAResman 8.0.0

com.apple.iokit.IOSurface 86.0.3

com.apple.iokit.IOBluetoothFamily 4.0.9f33

com.apple.driver.IOPlatformPluginFamily 5.2.0d16

com.apple.driver.AppleBacklightExpert 1.0.4

com.apple.driver.AppleHDAController 2.3.1f2

com.apple.iokit.IOHDAFamily 2.3.1f2

com.apple.driver.AppleSMC 3.1.4d2

com.apple.driver.AppleGraphicsControl 3.2.11

com.apple.iokit.IONDRVSupport 2.3.5

com.apple.iokit.IOGraphicsFamily 2.3.5

com.apple.driver.AppleUSBMultitouch 235.7

com.apple.iokit.IOUSBHIDDriver 5.2.5

com.apple.driver.AppleThunderboltDPInAdapter 1.8.5

com.apple.driver.AppleThunderboltDPAdapterFamily 1.8.5

com.apple.driver.AppleThunderboltPCIDownAdapter 1.2.5

com.apple.driver.AppleUSBMergeNub 5.2.5

com.apple.driver.AppleThunderboltNHI 1.6.0

com.apple.iokit.IOThunderboltFamily 2.1.1

com.apple.iokit.IOEthernetAVBController 1.0.2b1

com.apple.iokit.IO80211Family 500.15

com.apple.iokit.IONetworkingFamily 3.0

com.apple.iokit.IOUSBUserClient 5.2.5

com.apple.iokit.IOAHCIFamily 2.2.1

com.apple.driver.AppleEFIRuntime 1.6.1

com.apple.iokit.IOHIDFamily 1.8.0

com.apple.iokit.IOSMBusFamily 1.1

com.apple.security.sandbox 220

com.apple.kext.AppleMatch 1.0.0d1

com.apple.security.TMSafetyNet 7

com.apple.driver.DiskImages 344

com.apple.driver.AppleKeyStore 28.21

com.apple.iokit.IOUSBMassStorageClass 3.5.0

com.apple.driver.AppleUSBComposite 5.2.5

com.apple.iokit.IOSCSIBlockCommandsDevice 3.5.1

com.apple.iokit.IOStorageFamily 1.8

com.apple.iokit.IOSCSIArchitectureModelFamily 3.5.1

com.apple.iokit.IOUSBFamily 5.4.0

com.apple.driver.AppleACPIPlatform 1.6

com.apple.iokit.IOPCIFamily 2.7.2

com.apple.iokit.IOACPIFamily 1.4

com.apple.kec.corecrypto 1.0