Q: What does this error code mean? My MacBook Pro keeps restarting in a loop because of an error.

Anonymous UUID:       E18D4DDF-5B1B-E177-D59B-E25D0E020829

Sun Nov  3 14:48:45 2013

panic(cpu 1 caller 0xffffff8009c54be4): "a freed zone element has been modified: expected 0xffffff80239f1490 but found 0xffffff80339f1490, bits changed 0x10000000, at offset 0 of 16 in zone: kalloc.16"@/SourceCache/xnu/xnu-2422.1.72/osfmk/kern/zalloc.c:461

Backtrace (CPU 1), Frame : Return Address

0xffffff8082ed3560 : 0xffffff8009c22f69

0xffffff8082ed35e0 : 0xffffff8009c54be4

0xffffff8082ed3620 : 0xffffff8009c5267d

0xffffff8082ed3680 : 0xffffff8009c51d09

0xffffff8082ed3780 : 0xffffff8009c2aa2f

0xffffff8082ed37b0 : 0xffffff8009cd52da

0xffffff8082ed37e0 : 0xffffff7f8bf6378c

0xffffff8082ed38c0 : 0xffffff7f8bf67402

0xffffff8082ed3bd0 : 0xffffff8009dfc9db

0xffffff8082ed3c30 : 0xffffff8009dd544b

0xffffff8082ed3cb0 : 0xffffff8009dd4da4

0xffffff8082ed3d70 : 0xffffff8009dc2ebf

0xffffff8082ed3f50 : 0xffffff800a03de23

0xffffff8082ed3fb0 : 0xffffff8009cf3e06

      Kernel Extensions in backtrace:

         com.apple.filesystems.msdosfs(1.9)[EAB7553F-8FD7-364E-BD4C-756F4FDE7600]@0xffff ff7f8bf62000->0xffffff7f8bf6ffff

BSD process name corresponding to current thread: mdworker

Mac OS version:

13A603

Kernel version:

Darwin Kernel Version 13.0.0: Thu Sep 19 22:22:27 PDT 2013; root:xnu-2422.1.72~6/RELEASE_X86_64

Kernel UUID: 1D9369E3-D0A5-31B6-8D16-BFFBBB390393

Kernel slide:     0x0000000009a00000

Kernel text base: 0xffffff8009c00000

System model name: MacBookPro7,1 (Mac-F222BEC8)

System uptime in nanoseconds: 383590844327

last loaded kext at 268368078419: com.apple.driver.AppleUSBCDC          4.2.1b2 (addr 0xffffff7f8bf70000, size 20480)

last unloaded kext at 382156000074: com.apple.driver.AppleUSBCDC          4.2.1b2 (addr 0xffffff7f8bf70000, size 16384)

loaded kexts:

com.apple.filesystems.msdosfs          1.9

com.apple.driver.AppleHWSensor          1.9.5d0

com.apple.iokit.IOBluetoothSerialManager          4.2.0f6

com.apple.driver.AudioAUUC          1.60

com.apple.driver.AGPM          100.14.11

com.apple.filesystems.autofs          3.0

com.apple.driver.AppleHDA          2.5.2fc2

com.apple.driver.AppleMikeyHIDDriver          124

com.apple.driver.AppleSMCLMU          2.0.4d1

com.apple.iokit.IOUserEthernet          1.0.0d1

com.apple.driver.AppleUpstreamUserClient          3.5.13

com.apple.driver.AppleLPC          1.7.0

com.apple.GeForceTesla          8.1.8

com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0

com.apple.Dont_Steal_Mac_OS_X          7.0.0

com.apple.driver.AppleHWAccess          1

com.apple.driver.AppleBacklight          170.3.5

com.apple.driver.AppleMCCSControl          1.1.12

com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport          4.2.0f6

com.apple.driver.AppleMikeyDriver          2.5.2fc2

com.apple.driver.SMCMotionSensor          3.0.4d1

com.apple.driver.AppleUSBTCButtons          240.2

com.apple.driver.AppleIRController          325.7

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1

com.apple.BootCache          35

com.apple.driver.AppleUSBTCKeyboard          240.2

com.apple.driver.AppleUSBCardReader          3.3.5

com.apple.iokit.SCSITaskUserClient          3.6.0

com.apple.driver.XsanFilter          404

com.apple.iokit.IOAHCIBlockStorage          2.4.0

com.apple.iokit.AppleBCM5701Ethernet          3.6.9b9

com.apple.driver.AirPort.Brcm4331          700.20.22

com.apple.driver.AppleUSBHub          650.4.4

com.apple.driver.AppleFWOHCI          4.9.9

com.apple.driver.AppleAHCIPort          2.9.5

com.apple.driver.AppleUSBOHCI          650.4.1

com.apple.driver.AppleSmartBatteryManager          161.0.0

com.apple.driver.AppleUSBEHCI          650.4.1

com.apple.driver.AppleRTC          2.0

com.apple.driver.AppleHPET          1.8

com.apple.driver.AppleACPIButtons          2.0

com.apple.driver.AppleSMBIOS          2.0

com.apple.driver.AppleACPIEC          2.0

com.apple.driver.AppleAPIC          1.7

com.apple.driver.AppleIntelCPUPowerManagementClient          216.0.0

com.apple.nke.applicationfirewall          153

com.apple.security.quarantine          3

com.apple.driver.AppleIntelCPUPowerManagement          216.0.0

com.apple.iokit.IOSerialFamily          10.0.7

com.apple.AppleGraphicsDeviceControl          3.4.12

com.apple.kext.triggers          1.0

com.apple.driver.DspFuncLib          2.5.2fc2

com.apple.vecLib.kext          1.0.0

com.apple.iokit.IOAudioFamily          1.9.4fc11

com.apple.kext.OSvKernDSPLib          1.14

com.apple.nvidia.classic.NVDANV50HalTesla          8.1.8

com.apple.nvidia.classic.NVDAResmanTesla          8.1.8

com.apple.driver.IOPlatformPluginLegacy          1.0.0

com.apple.driver.IOPlatformPluginFamily          5.5.1d27

com.apple.iokit.IOSurface          91

com.apple.iokit.IOBluetoothFamily          4.2.0f6

com.apple.driver.AppleHDAController          2.5.2fc2

com.apple.iokit.IOHDAFamily          2.5.2fc2

com.apple.driver.AppleBacklightExpert          1.0.4

com.apple.iokit.IOBluetoothHostControllerUSBTransport          4.2.0f6

com.apple.iokit.IOFireWireIP          2.2.5

com.apple.driver.AppleSMBusController          1.0.11d1

com.apple.driver.AppleSMBusPCI          1.0.12d1

com.apple.iokit.IONDRVSupport          2.3.6

com.apple.iokit.IOGraphicsFamily          2.3.6

com.apple.driver.AppleSMC          3.1.6d1

com.apple.driver.AppleUSBMultitouch          240.6

com.apple.iokit.IOUSBHIDDriver          650.4.4

com.apple.iokit.IOSCSIBlockCommandsDevice          3.6.0

com.apple.iokit.IOUSBMassStorageClass          3.6.0

com.apple.driver.AppleUSBMergeNub          650.4.0

com.apple.driver.AppleUSBComposite          650.4.0

com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.6.0

com.apple.iokit.IOBDStorageFamily          1.7

com.apple.iokit.IODVDStorageFamily          1.7.1

com.apple.iokit.IOCDStorageFamily          1.7.1

com.apple.iokit.IOAHCISerialATAPI          2.6.0

com.apple.iokit.IOSCSIArchitectureModelFamily          3.6.0

com.apple.iokit.IOEthernetAVBController          1.0.3b3

com.apple.driver.mDNSOffloadUserClient          1.0.1b4

com.apple.iokit.IO80211Family          600.34

com.apple.iokit.IONetworkingFamily          3.2

com.apple.iokit.IOUSBUserClient          650.4.4

com.apple.iokit.IOFireWireFamily          4.5.5

com.apple.iokit.IOAHCIFamily          2.6.0

com.apple.driver.NVSMU          2.2.9

com.apple.iokit.IOUSBFamily          650.4.4

com.apple.driver.AppleEFINVRAM          2.0

com.apple.driver.AppleEFIRuntime          2.0

com.apple.iokit.IOHIDFamily          2.0.0

com.apple.iokit.IOSMBusFamily          1.1

com.apple.security.sandbox          278.10

com.apple.kext.AppleMatch          1.0.0d1

com.apple.security.TMSafetyNet          7

com.apple.driver.AppleKeyStore          2

com.apple.driver.DiskImages          371.1

com.apple.iokit.IOStorageFamily          1.9

com.apple.iokit.IOReportFamily          21

com.apple.driver.AppleFDEKeyStore          28.30

com.apple.driver.AppleACPIPlatform          2.0

com.apple.iokit.IOPCIFamily          2.8

com.apple.iokit.IOACPIFamily          1.4

com.apple.kec.corecrypto          1.0

com.apple.kec.pthread          1

Model: MacBookPro7,1, BootROM MBP71.0039.B0E, 2 processors, Intel Core 2 Duo, 2.4 GHz, 4 GB, SMC 1.62f7

Graphics: NVIDIA GeForce 320M, NVIDIA GeForce 320M, PCI, 256 MB

Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1067 MHz, 0x859B, 0x435435313236344243313036372E4D313646

AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8D), Broadcom BCM43xx 1.0 (5.106.98.100.22)

Bluetooth: Version 4.2.0f6 12982, 3 services, 23 devices, 1 incoming serial ports

Network Service: Wi-Fi, AirPort, en1

Serial ATA Device: Hitachi HTS545025B9SA02, 250.06 GB

Serial ATA Device: MATSHITADVD-R   UJ-898

USB Device: Built-in iSight

USB Device: Internal Memory Card Reader

USB Device: BRCM2046 Hub

USB Device: Bluetooth USB Host Controller

USB Device: Apple Internal Keyboard / Trackpad

USB Device: IR Receiver

Thunderbolt Bus: