Seems like it's being caused by VirtualBox. Have you tried removing all references to VirtualBox?
I removed virtualbox, but I got a kernel panic again, here's the report:
Wed Jun 29 14:49:43 2011
panic(cpu 0 caller 0xffffff80002d1208): Kernel trap at 0xffffff800034c2ed, type 14=page fault, registers:
CR0: 0x000000008001003b, CR2: 0x0000000000000000, CR3: 0x0000000000100000, CR4: 0x0000000000040660
RAX: 0xffffff80afb937c0, RBX: 0x000000001325a2d8, RCX: 0xffffff801325a2d8, RDX: 0x0000000000000100
RSP: 0xffffff80afb93760, RBP: 0xffffff80afb93760, RSI: 0xffffff80afb937c0, RDI: 0xffffff801325a2d8
R8: 0x0000000000000000, R9: 0x0000000000000000, R10: 0x0000000000000000, R11: 0x0000000000000000
R12: 0xffffff80a95fbd00, R13: 0x000000000007fff8, R14: 0xffffff80a95fbd00, R15: 0x0000000000000010
RFL: 0x0000000000010246, RIP: 0xffffff800034c2ed, CS: 0x0000000000000008, SS: 0x0000000000000010
Error code: 0x0000000000000002
Backtrace (CPU 0), Frame : Return Address
0xffffff80afb93400 : 0xffffff8000204d15
0xffffff80afb93500 : 0xffffff80002d1208
0xffffff80afb93650 : 0xffffff80002e3f4a
0xffffff80afb93660 : 0xffffff800034c2ed
0xffffff80afb93760 : 0xffffff8000367b14
0xffffff80afb93820 : 0xffffff8000369628
0xffffff80afb93980 : 0xffffff80003674a0
0xffffff80afb93b90 : 0xffffff800035cab9
0xffffff80afb93bf0 : 0xffffff800035e06d
0xffffff80afb93d70 : 0xffffff800035e1ce
0xffffff80afb93d90 : 0xffffff8000344370
0xffffff80afb93dc0 : 0xffffff800032fc17
0xffffff80afb93e80 : 0xffffff800032bbb7
0xffffff80afb93eb0 : 0xffffff800032e5fd
0xffffff80afb93f50 : 0xffffff800032e86b
0xffffff80afb93fa0 : 0xffffff80002c8527
BSD process name corresponding to current thread: kernel_task
Mac OS version:
10K540
Kernel version:
Darwin Kernel Version 10.8.0: Tue Jun 7 16:32:41 PDT 2011; root:xnu-1504.15.3~1/RELEASE_X86_64
System model name: MacBookPro8,2 (Mac-94245A3940C91C80)
System uptime in nanoseconds: 5814511981421
unloaded kexts:
(none)
loaded kexts:
org.virtualbox.kext.VBoxNetAdp 4.0.8
org.virtualbox.kext.VBoxNetFlt 4.0.8
org.virtualbox.kext.VBoxUSB 4.0.8
org.virtualbox.kext.VBoxDrv 4.0.8
com.tuxera.filesystems.tufsfs.fusefs_txantfs 2010.12.28
com.apple.driver.AppleTyMCEDriver 1.0.2d2
com.apple.driver.AGPM 100.12.31
com.apple.driver.AppleHWSensor 1.9.3d0
com.apple.driver.AudioAUUC 1.57
com.apple.driver.AppleUpstreamUserClient 3.5.7
com.apple.driver.AppleMikeyHIDDriver 1.2.0
com.apple.driver.AppleMCCSControl 1.0.20
com.apple.driver.AppleIntelPenrynProfile 17
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AppleMikeyDriver 2.0.5f13
com.apple.kext.ATIFramebuffer 6.3.6
com.apple.driver.AppleIntelHDGraphics 6.3.6
com.apple.driver.AppleIntelNehalemProfile 11
com.apple.driver.AppleHDA 2.0.5f13
com.apple.driver.AudioIPCDriver 1.1.6
com.apple.ATIRadeonX3000 6.3.6
com.apple.iokit.AppleBCM5701Ethernet 3.0.5b8
com.apple.driver.AppleIntelMeromProfile 19
com.apple.driver.AppleGraphicsControl 2.10.6
com.apple.driver.AirPort.Brcm4331 433.11.5
com.apple.driver.ACPI_SMC_PlatformPlugin 4.7.0a1
com.apple.driver.AppleLPC 1.5.1
com.apple.driver.AppleBacklight 170.0.46
com.apple.kext.AppleSMCLMU 1.5.2d10
com.apple.driver.AppleIntelSNBGraphicsFB 6.3.6
com.apple.driver.SMCMotionSensor 3.0.1d2
com.apple.filesystems.autofs 2.1.0
com.apple.driver.AppleUSBTCButtons 201.6
com.apple.driver.AppleUSBTCKeyEventDriver 201.6
com.apple.driver.AppleUSBTCKeyboard 201.6
com.apple.driver.AppleIRController 303.8
com.apple.iokit.SCSITaskUserClient 2.6.8
com.apple.driver.AppleUSBHub 4.2.4
com.apple.iokit.IOAHCIBlockStorage 1.6.4
com.apple.driver.AppleFWOHCI 4.7.3
com.apple.BootCache 31.1
com.apple.driver.AppleSDXC 1.0.3
com.apple.driver.AppleUSBEHCI 4.2.4
com.apple.driver.AppleSmartBatteryManager 160.0.0
com.apple.driver.AppleEFINVRAM 1.4.0
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.driver.AppleAHCIPort 2.1.7
com.apple.driver.AppleUSBUHCI 4.2.0
com.apple.driver.AppleACPIButtons 1.3.6
com.apple.driver.AppleRTC 1.3.1
com.apple.driver.AppleHPET 1.5
com.apple.driver.AppleSMBIOS 1.7
com.apple.driver.AppleACPIEC 1.3.6
com.apple.driver.AppleAPIC 1.4
com.apple.driver.AppleIntelCPUPowerManagementClient 142.6.0
com.apple.security.sandbox 1
com.apple.security.quarantine 0
com.apple.nke.applicationfirewall 2.1.12
com.apple.driver.AppleIntelCPUPowerManagement 142.6.0
com.apple.driver.AppleUSBAudio 2.7.6f6 - last loaded 1879182589957
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 74.2
com.apple.iokit.IOBluetoothSerialManager 2.4.5f3
com.apple.iokit.IOSerialFamily 10.0.3
com.apple.driver.AppleHDAHardwareConfigDriver 2.0.5f13
com.apple.driver.DspFuncLib 2.0.5f13
com.apple.iokit.IOAudioFamily 1.8.3fc2
com.apple.kext.OSvKernDSPLib 1.3
com.apple.driver.AppleSMBusController 1.0.10d0
com.apple.iokit.IOFireWireIP 2.0.3
com.apple.iokit.AppleProfileFamily 41
com.apple.driver.AppleHDAController 2.0.5f13
com.apple.iokit.IOHDAFamily 2.0.5f13
com.apple.iokit.IO80211Family 320.1
com.apple.iokit.IONetworkingFamily 1.10
com.apple.driver.IOPlatformPluginFamily 4.7.0a1
com.apple.driver.AppleSMBusPCI 1.0.10d0
com.apple.driver.AppleBacklightExpert 1.0.1
com.apple.iokit.IONDRVSupport 2.2
com.apple.driver.AppleThunderboltEDMSink 1.1.1
com.apple.driver.AppleThunderboltEDMSource 1.1.1
com.apple.kext.ATI6000Controller 6.3.6
com.apple.kext.ATISupport 6.3.6
com.apple.iokit.IOGraphicsFamily 2.2
com.apple.driver.AppleSMC 3.1.0d5
com.apple.driver.AppleThunderboltDPOutAdapter 1.3.2
com.apple.driver.AppleThunderboltDPInAdapter 1.3.2
com.apple.driver.AppleThunderboltDPAdapterFamily 1.3.2
com.apple.driver.AppleThunderboltPCIDownAdapter 1.1.6
com.apple.driver.BroadcomUSBBluetoothHCIController 2.4.5f3
com.apple.driver.AppleUSBBluetoothHCIController 2.4.5f3
com.apple.iokit.IOBluetoothFamily 2.4.5f3
com.apple.driver.AppleUSBMultitouch 207.7
com.apple.iokit.IOUSBHIDDriver 4.2.0
com.apple.driver.AppleUSBMergeNub 4.2.4
com.apple.driver.AppleUSBComposite 3.9.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.6.8
com.apple.iokit.IOBDStorageFamily 1.6
com.apple.iokit.IODVDStorageFamily 1.6
com.apple.iokit.IOCDStorageFamily 1.6.1
com.apple.driver.AppleThunderboltNHI 1.2.6
com.apple.iokit.IOThunderboltFamily 1.4.9
com.apple.driver.XsanFilter 402.1
com.apple.iokit.IOAHCISerialATAPI 1.2.6
com.apple.iokit.IOSCSIArchitectureModelFamily 2.6.8
com.apple.iokit.IOUSBUserClient 4.2.4
com.apple.iokit.IOFireWireFamily 4.2.6
com.apple.driver.AppleFileSystemDriver 2.0
com.apple.iokit.IOAHCIFamily 2.0.6
com.apple.iokit.IOUSBFamily 4.2.4
com.apple.driver.AppleEFIRuntime 1.4.0
com.apple.iokit.IOHIDFamily 1.6.6
com.apple.iokit.IOSMBusFamily 1.1
com.apple.security.TMSafetyNet 6
com.apple.kext.AppleMatch 1.0.0d1
com.apple.driver.DiskImages 289.1
com.apple.iokit.IOStorageFamily 1.6.3
com.apple.driver.AppleACPIPlatform 1.3.6
com.apple.iokit.IOPCIFamily 2.6.5
com.apple.iokit.IOACPIFamily 1.3.0