MBP restarts by itself

Twice (today and yesterday) my MacBook Pro has restarted by itself. It showed the message "Your computer restarted because of a problem." I attached the error report. Is there anyway to determine what the issue is?

Tue Oct 6 23:03:03 2015

*** Panic Report ***

panic(cpu 6 caller 0xffffff801c5f102b): "soclose: NOFDREF"@/Library/Caches/com.apple.xbs/Sources/xnu/xnu-3247.1.106/bsd/kern/uipc _socket.c:1263

Backtrace (CPU 6), Frame : Return Address

0xffffff80315c3d20 : 0xffffff801c0e5357

0xffffff80315c3da0 : 0xffffff801c5f102b

0xffffff80315c3df0 : 0xffffff801c617ef4

0xffffff80315c3e10 : 0xffffff7f9eb6c36c

0xffffff80315c3f00 : 0xffffff801c1196ba

0xffffff80315c3fb0 : 0xffffff801c1d14b7

Kernel Extensions in backtrace:

com.apple.nke.applicationfirewall(163.0)[7A675D29-0F65-3B62-ACA5-E34645E16E53]@ 0xffffff7f9eb67000->0xffffff7f9eb6efff

BSD process name corresponding to current thread: kernel_task

Mac OS version:

15A284

Kernel version:

Darwin Kernel Version 15.0.0: Wed Aug 26 16:57:32 PDT 2015; root:xnu-3247.1.106~1/RELEASE_X86_64

Kernel UUID: 37BC582F-8BF4-3F65-AFBB-ECF792060C68

Kernel slide: 0x000000001be00000

Kernel text base: 0xffffff801c000000

__HIB text base: 0xffffff801bf00000

System model name: MacBookPro11,2 (Mac-3CBD00234E554E41)

System uptime in nanoseconds: 41552343212578

last loaded kext at 33305260971487: com.apple.driver.AppleMikeyHIDDriver 124 (addr 0xffffff7f9ebd4000, size 20480)

last unloaded kext at 32563566138866: com.apple.driver.AppleMikeyHIDDriver 124 (addr 0xffffff7f9ebd4000, size 12288)

loaded kexts:

com.avg.Antivirus.OnAccess.kext 2015.0

com.apple.driver.AppleMikeyHIDDriver 124

com.apple.filesystems.smbfs 3.0.0

com.apple.driver.AudioAUUC 1.70

com.apple.driver.AGPM 110.20.19

com.apple.driver.ApplePlatformEnabler 2.5.1d0

com.apple.driver.X86PlatformShim 1.0.0

com.apple.filesystems.autofs 3.0

com.apple.driver.AppleGraphicsDevicePolicy 3.7.7

com.apple.driver.AppleUpstreamUserClient 3.6.1

com.apple.driver.AppleOSXWatchdog 1

com.apple.driver.AppleHDA 272.50

com.apple.driver.pmtelemetry 1

com.apple.iokit.IOUserEthernet 1.0.1

com.apple.iokit.IOBluetoothSerialManager 4.4.0f4

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.driver.AppleIntelHD5000Graphics 10.0.8

com.apple.driver.AppleHV 1

com.apple.driver.AppleBacklight 170.8.1

com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.4.0f4

com.apple.driver.AppleThunderboltIP 3.0.8

com.apple.driver.AppleSMCLMU 208

com.apple.driver.AppleLPC 3.1

com.apple.driver.AppleCameraInterface 5.41.0

com.apple.driver.AppleIntelFramebufferAzul 10.0.8

com.apple.driver.AppleIntelSlowAdaptiveClocking 4.0.0

com.apple.driver.AppleMCCSControl 1.2.13

com.apple.driver.AppleUSBCardReader 3.7.1

com.apple.driver.AppleUSBTCButtons 245.4

com.apple.driver.AppleUSBTCKeyboard 245.4

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0

com.apple.BootCache 37

com.apple.iokit.IOAHCIBlockStorage 2.8.0

com.apple.driver.AppleAHCIPort 3.1.5

com.apple.driver.AirPort.Brcm4360 1000.13.1a3

com.apple.driver.AppleSmartBatteryManager 161.0.0

com.apple.driver.AppleACPIButtons 4.0

com.apple.driver.AppleRTC 2.0

com.apple.driver.AppleHPET 1.8

com.apple.driver.AppleSMBIOS 2.1

com.apple.driver.AppleACPIEC 4.0

com.apple.driver.AppleAPIC 1.7

com.apple.nke.applicationfirewall 163

com.apple.security.quarantine 3

com.apple.security.TMSafetyNet 8

com.apple.kext.triggers 1.0

com.apple.driver.DspFuncLib 272.50

com.apple.kext.OSvKernDSPLib 525

com.apple.iokit.IOSerialFamily 11

com.apple.iokit.IOSurface 108.0.1

com.apple.driver.CoreCaptureResponder 1

com.apple.driver.AppleGraphicsControl 3.11.31

com.apple.driver.AppleBacklightExpert 1.1.0

com.apple.iokit.IONDRVSupport 2.4.1

com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.4.0f4

com.apple.iokit.IOBluetoothFamily 4.4.0f4

com.apple.driver.AppleHDAController 272.50

com.apple.iokit.IOHDAFamily 272.50

com.apple.iokit.IOAudioFamily 203.8

com.apple.vecLib.kext 1.2.0

com.apple.AppleGraphicsDeviceControl 3.11.31

com.apple.iokit.IOAcceleratorFamily2 203.7.1

com.apple.driver.X86PlatformPlugin 1.0.0

com.apple.driver.IOPlatformPluginFamily 6.0.0d7

com.apple.iokit.IOSlowAdaptiveClockingFamily 1.0.0

com.apple.driver.AppleSMC 3.1.9

com.apple.driver.AppleSMBusController 1.0.14d1

com.apple.iokit.IOGraphicsFamily 2.4.1

com.apple.iokit.IOSCSIBlockCommandsDevice 3.7.7

com.apple.iokit.IOUSBMassStorageDriver 1.0.0

com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.7

com.apple.driver.AppleUSBMultitouch 250.4

com.apple.iokit.IOUSBHIDDriver 900.4.1

com.apple.driver.usb.AppleUSBHostCompositeDevice 1.0.1

com.apple.driver.usb.AppleUSBHub 1.0.1

com.apple.driver.CoreStorage 517

com.apple.iokit.IOAHCIFamily 2.8.0

com.apple.driver.AppleThunderboltDPInAdapter 4.1.2

com.apple.driver.AppleThunderboltDPAdapterFamily 4.1.2

com.apple.driver.AppleThunderboltPCIDownAdapter 2.0.2

com.apple.driver.AppleThunderboltNHI 4.0.1

com.apple.iokit.IOThunderboltFamily 5.0.6

com.apple.iokit.IO80211Family 1100.23

com.apple.driver.mDNSOffloadUserClient 1.0.1b8

com.apple.iokit.IONetworkingFamily 3.2

com.apple.driver.corecapture 1.0.4

com.apple.driver.usb.AppleUSBXHCIPCI 1.0.1

com.apple.driver.usb.AppleUSBXHCI 1.0.1

com.apple.iokit.IOUSBFamily 900.4.1

com.apple.iokit.IOUSBHostFamily 1.0.1

com.apple.driver.AppleUSBHostMergeProperties 1.0.1

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 300.0

com.apple.kext.AppleMatch 1.0.0d1

com.apple.driver.AppleKeyStore 2

com.apple.driver.AppleMobileFileIntegrity 1.0.5

com.apple.driver.AppleCredentialManager 1.0

com.apple.driver.DiskImages 414

com.apple.iokit.IOStorageFamily 2.1

com.apple.iokit.IOReportFamily 31

com.apple.driver.AppleFDEKeyStore 28.30

com.apple.driver.AppleACPIPlatform 4.0

com.apple.iokit.IOPCIFamily 2.9

com.apple.iokit.IOACPIFamily 1.4

com.apple.kec.Libm 1

com.apple.kec.pthread 1

com.apple.kec.corecrypto 1.0