My MacBook Pro keeps restarting

Okay, here we go. My Macbook keeps restarting (only when I turn it on) and this comes out: Interval Since Last Panic Report: 140921 sec
Panics Since Last Report: 1
Anonymous UUID: 88B48980-BB33-0AB7-C47B-641DF79A6594

Sun Oct 14 13:16:20 2012
panic(cpu 0 caller 0xffffff8012eb7bd5): Kernel trap at 0xffffff8012e2e906, type 12=stack bounds, registers:
CR0: 0x000000008001003b, CR2: 0xffffff8085885000, CR3: 0x0000000015b1b000, CR4: 0x0000000000000660
RAX: 0xe7294dfccec40061, RBX: 0xffffff801e00e000, RCX: 0x0000000009000000, RDX: 0xffffff807f819078
RSP: 0xffffff808b03be40, RBP: 0x01ffff808b03beb0, RSI: 0xffffff807f819068, RDI: 0x0000000000000000
R8: 0xffffff80134bec60, R9: 0x0000000000000000, R10: 0xffffff801e0af780, R11: 0x00000000ffffff80
R12: 0x0000000000000001, R13: 0x0000000000000000, R14: 0xffffff801e12f550, R15: 0x0000000000000000
RFL: 0x0000000000010046, RIP: 0xffffff8012e2e906, CS: 0x0000000000000008, SS: 0x0000000000000000
Fault CR2: 0xffffff8085885000, Error code: 0x0000000000000000, Fault CPU: 0x0

Backtrace (CPU 0), Frame : Return Address
0xffffff808b03bae0 : 0xffffff8012e1d626
0xffffff808b03bb50 : 0xffffff8012eb7bd5
0xffffff808b03bd20 : 0xffffff8012ece4ed
0xffffff808b03bd40 : 0xffffff8012e2e906
No mapping exists for frame pointer
Backtrace terminated-invalid frame pointer 0x1ffff808b03beb0

BSD process name corresponding to current thread: kernel_task

Mac OS version:
Not yet set

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: 0x0000000012c00000
Kernel text base: 0xffffff8012e00000
System model name: MacBookPro7,1 (Mac-F222BEC8)

System uptime in nanoseconds: 1440104145
last loaded kext at 323322139: com.apple.driver.XsanFilter 404 (addr 0xffffff7f94b0e000, size 20480)
loaded kexts:
com.apple.driver.XsanFilter 404
com.apple.iokit.IOAHCIBlockStorage 2.2.2
com.apple.driver.AppleIntelCPUPowerManagementClient 196.0.0
com.apple.driver.AppleUSBHub 5.2.5
com.apple.iokit.AppleBCM5701Ethernet 3.2.5b3
com.apple.driver.AirPort.Brcm4331 602.15.22
com.apple.driver.AppleFWOHCI 4.9.6
com.apple.driver.AppleAHCIPort 2.4.1
com.apple.driver.AppleSmartBatteryManager 161.0.0
com.apple.driver.AppleUSBEHCI 5.4.0
com.apple.driver.AppleUSBOHCI 5.2.5
com.apple.driver.AppleEFINVRAM 1.6.1
com.apple.driver.AppleRTC 1.5
com.apple.driver.AppleHPET 1.7
com.apple.driver.AppleACPIButtons 1.6
com.apple.driver.AppleSMBIOS 1.9
com.apple.driver.AppleACPIEC 1.6
com.apple.driver.AppleAPIC 1.6
com.apple.nke.applicationfirewall 4.0.39
com.apple.security.quarantine 2
com.apple.driver.AppleIntelCPUPowerManagement 196.0.0
com.apple.iokit.IOAHCISerialATAPI 2.5.0
com.apple.iokit.IOSCSIArchitectureModelFamily 3.5.1
com.apple.iokit.IOUSBUserClient 5.2.5
com.apple.iokit.IOEthernetAVBController 1.0.2b1
com.apple.iokit.IO80211Family 500.15
com.apple.iokit.IONetworkingFamily 3.0
com.apple.iokit.IOFireWireFamily 4.5.5
com.apple.driver.AppleMCP89RootPortPM 1.11
com.apple.iokit.IOAHCIFamily 2.2.1
com.apple.iokit.IOUSBFamily 5.4.0
com.apple.driver.NVSMU 2.2.9
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.iokit.IOStorageFamily 1.8
com.apple.driver.AppleKeyStore 28.21
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

Can anyone tell me what does it mean?

Btw, about my MacBook Pro 13-inch, Mid 2010:
Software OS X 10.8.2 (12C60)
Processor 2.4 GHz Intel Core 2 Duo
Memory 4 GB 1067 MHz DDR3
Graphics NVIDIA GeForce 320M 256 MB

Thank you.

Kernel panics are usually indicative of a hardware problem. The KP report really doesn't tell us much but it could be bad memory or a memory fault that's causing it to happen. Anyway, that would be the first thing to check. Download "Memtest for Mac" from here and run it in extended mode. Post back the results and we can go from there if need be.

Mac OS X 10.8.2 (12C60) running in multiuser mode
Memory Page Size: 4096
System has 2 Intel core(s) with SSE
Requested memory: 1942MB (2036723712 bytes)
Available memory: 1942MB (2036723712 bytes)
Allocated memory: 1942MB (2036723712 bytes) at local address 0x0000000101000000
Attempting memory lock... locked successfully
Partitioning memory into 2 comparison buffers...
Buffer A: 971MB (1018361856 bytes) starts at local address 0x0000000101000000
Buffer B: 971MB (1018361856 bytes) starts at local address 0x000000013db2f800

Running 2 test sequences... (CTRL-C to quit)

Test sequence 1 of 2:

Running tests on full 1942MB region...
Stuck Address : ok
Linear PRN : ok
Running comparison tests using 971MB buffers...
Random Value : ok
Compare XOR : ok
Compare SUB : ok
Compare MUL : ok
Compare DIV : ok
Compare OR : ok
Compare AND : ok
Sequential Increment: ok
Solid Bits : ok
Block Sequential : ok
Checkerboard : ok
Bit Spread : ok
Bit Flip : ok
Walking Ones : ok
Walking Zeroes : ok

Test sequence 2 of 2:

Running tests on full 1942MB region...
Stuck Address : ok
Linear PRN : ok
Running comparison tests using 971MB buffers...
Random Value : ok
Compare XOR : ok
Compare SUB : ok
Compare MUL : ok
Compare DIV : ok
Compare OR : ok
Compare AND : ok
Sequential Increment: ok
Solid Bits : ok
Block Sequential : ok
Checkerboard : ok
Bit Spread : ok
Bit Flip : ok
Walking Ones : ok
Walking Zeroes : ok

All tests passed! Execution time: 4957 seconds.