Report of panic * - what this means?

My iMac is randomly goes black and reboot. I used EtreCheck and pasted the report below as well as the * panic report *.

How can I do this random restart stop?

EtreCheck version: 2.9.12 (265)

Report generated 2016-06-21 11:31:37

Download EtreCheck from https://etrecheck.com

Time 08:00

Performance: Below average

Click the [Support] links to help with non-Apple products.

Click [details] for more information on this line.

Problem: Computer restarts

Hardware Information: ⓘ

iMac (27 inch, mid 2011)

[Data sheet] - [User Guide] - [warranty & Service]

iMac - model: iMac12, 2

1 3.1 GHz Intel Core i5 CPU: 4 strands

8 GB of RAM expandable - [Instructions]

BANK 0/DIMM0

OK 4 GB DDR3 1333 MHz

BANK 1/DIMM0

OK 4 GB DDR3 1333 MHz

0/DIMM1 BANK

Vacuum

BANK 1/DIMM1

Vacuum

Bluetooth: Old - transfer/Airdrop2 not supported

Wireless: en1: 802.11 a/b/g/n

Video information: ⓘ

AMD Radeon HD 6970M - VRAM: 1024 MB

iMac 2560 x 1440

Software: ⓘ

OS X El Capitan 10.11.5 (15F34) - since startup time: less than an hour

Disc information: ⓘ

ST31000528AS disk0: (1 TB) (rotation)

EFI (disk0s1) /Volumes/firmwaresyncd.5JrmsV: 210 MB (191 MB free)

Macintosh HD (disk0s2) /: 999,35 go-go (605,76 free)

Recovery HD (disk0s3) < not mounted > [recovery]: 650 MB

HL-DT-STDVDRW GA32N)

USB information: ⓘ

Apple Inc. FaceTime HD camera (built-in)

Hub keyboard Apple, Inc.

Apple Inc. Apple Keyboard

Apple Inc. BRCM2046 hub.

Apple Inc. Bluetooth USB host controller.

SL Slim BUP Seagate 2 TB

EFI (disk1s1) < not mounted >: 210 MB

(Disk1s2) BACKUP / Volumes/BACKUP: 2.00 TB (861,54 GB free)

Computer, Inc. Apple IR receiver.

Card reader Apple

Lightning information: ⓘ

Apple Inc. Thunderbolt_bus.

Guardian: ⓘ

Mac App Store and identified developers

Kernel extensions: ⓘ

/ Library/Extensions

[loading] net.telestream.driver.TelestreamAudio (1.1.1 - SDK 10.8 - 2016-06-11) [Support]

/ System/Library/Extensions

com.DYMO.usbprinterclassdriver.kext [no charge] (1.0 - 2016-06-11) [Support]

com.PCTOOLS.iantivirus.KFS [no charge] (1.0.1 - 2016-06-11) [Support]

com.seagate.driver.PowSecDriverCore [no charge] (5.0.1 - 2016-06-11) [Support]

/ System/Library/Extensions/Seagate storage Driver.kext/Contents/PlugIns

com.seagate.driver.PowSecLeafDriver_10_4 [no charge] (5.0.1 - 2010-10-19) [Support]

com.seagate.driver.PowSecLeafDriver_10_5 [no charge] (5.0.1 - 2010-10-19) [Support]

com.seagate.driver.SeagateDriveIcons [no charge] (5.0.1 - 2010-10-19) [Support]

Launch system officers: ⓘ

[loaded] 9 tasks Apple

[loading] 164 tasks Apple

[operation] 65 tasks Apple

Launch system demons: ⓘ

[loaded] 40 jobs Apple

[loading] 162 tasks Apple

[operation] 89 tasks Apple

Launch officers: ⓘ

[loading] com.oracle.java.Java - Updater.plist (2014-09-27) [Support]

[operation] com.seagate.SeagateStorageGauge.plist (2010-03-10) [Support]

Launch demons: ⓘ

bootps.plist [loading]

[loading] com.adobe.fpsaud.plist (2016-05-09) [Support]

[loading] com.adobe.versioncueCS4.plist (2009-11-14) [Support]

com.danga.memcached.plist [no charge]

[loading] com.microsoft.office.licensing.helper.plist (2012-11-05) [Support]

[loading] com.oracle.java.Helper - Tool.plist (2014-09-27) [Support]

[ongoing] com.vix.cron.plist

exec.plist [loading]

finger.plist [loading]

FTP.plist [loading]

[loading] jp.co.canon.MasterInstaller.plist (2016-05-24) [Support]

login.plist [loading]

ntalk.plist [loading]

org.Apache.httpd.plist [loading]

[loading] org.cups.cups - lpd.plist

[ongoing] org.cups.cupsd.plist

[loading] org .net - snmp.snmpd.plist

[ongoing] org.ntp.ntpd.plist

org.openldap.slapd.plist [loading]

org.Postfix.master.plist [loading]

Shell.plist [loading]

SSH.plist [loading]

Telnet.plist [loading]

TFTP.plist [loading]

User launch officers: ⓘ

[loading] com.citrixonline.GoToMeeting.G2MUpdate.plist (2016-06-13) [Support]

[operation] com.lastpass.LastPassHelper.plist (2016-04-13) [Support]

Items in user login: ⓘ

Dropbox application (/ Applications/Dropbox.app)

Google Chrome application (Google Chrome.app/Applications /)

Request for SpeechSynthesisServer (/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks SpeechSynthesis.framework/Versions/A/SpeechSynthesisServer.app)

Other applications: ⓘ

[ongoing] com.etresoft.EtreCheck.208032

[ongoing] com.evernote.EvernoteHelper

[ongoing] com.getdropbox.dropbox.1952

com.google.Chrome.60512 [loading]

[loading] 404 tasks Apple

[operation] 170 tasks Apple

Plug-ins Internet: ⓘ

DirectorShockwave: 11.6.5r635 (2012-04-27) [Support]

nplastpass: 4.1.2 - SDK 10.11 (2016-04-13) [Support]

Default browser: 601 - SDK 10.11 (2016-05-24)

AdobePDFViewerNPAPI: 11.0.07 - SDK 10.6 (2014-05-22) [Support]

FlashPlayer - 10.6: 21.0.0.213 - SDK 10.6 (2016-04-13) [Support]

Silverlight: 5.1.30514.0 - SDK 10.6 (2015-01-07) [Support]

QuickTime Plugin: 7.7.3 (2016-05-24)

Flash Player: 21.0.0.213 - SDK 10.6 (2016-04-13) obsolete! Update

PepperFlashPlayer: 21.0.0.242 - SDK 10.6 (2016-05-30) [Support]

SharePointBrowserPlugin: 14.6.4 - SDK 10.6 (2016-05-16) [Support]

AdobePDFViewer: 11.0.07 - SDK 10.6 (2014-05-22) [Support]

iPhotoPhotocast: 7.0 - 10.8 SDK (2013-04-17)

JavaAppletPlugin: Java 8 update 91 build 14 (2016-05-28) check the version of

User Plug-ins internet: ⓘ

CitrixOnlineWebDeploymentPlugin: 1.0.105 (2013-04-25) [Support]

Safari extensions: ⓘ

Buffer - buffer - http://buffer.com (2016-04-13)

Save on Pocket - Read It Later, Inc. - http://getpocket.com/ (2016-04-13)

Clean the links to Google - Dennis Umetzu - http://www.umetzu.com (2016-05-06)

LastPass - LastPass - https://lastpass.com (2016-05-06)

EverNote Web Clipper - Evernote Corp. - http://evernote.com (2016-05-27)

PIN button - Pinterest, Inc. - http://www.pinterest.com/ (2016-05-06)

3rd party preference panes: ⓘ

DivX (2010-08-25) [Support]

Flash Player (2016-05-09) [Support]

Flip4Mac WMV (2012-09-14) [Support]

Java (2016-05-28) [Support]

Time Machine: ⓘ

Skip system files: No.

Mobile backups: OFF

Automatic backup: YES

Volumes to back up:

Macintosh HD: Disc size: 999,35 GB disc used: 393,59 GB

Destinations:

BACKUP [Local]

Total size: 2.00 TB

Total number of backups: 53

An older backup: 13/02/16, 12:38 AM

Last backup: 20/06/16, 18:57

Size of backup drive: adequate

Size of backup 2.00 TB > (disc 393,59 GB X 3)

Top of page process CPU: ⓘ

9% Google Chrome Helper (20)

3% kernel_task

2% WindowServer

1% Dropbox

0% mdworker (3)

Top of page process of memory: ⓘ

2.37 GB Google Chrome Helper (20)

Kernel_task 715 MB

270 MB Google Chrome

Dropbox 131 MB

Mds_stores 98 MB

Virtual memory information: ⓘ

3.03 GB of free RAM

4.97 GB used RAM (1.81 GB being cached)

Used Swap 0 B

Diagnostic information: ⓘ

21 June 2016, 11:19:59 /Library/Logs/DiagnosticReports/Kernel_2016-06-21-111959_[redacted].panic [details]

21 June 2016, 11:19:27 test - passed

June 20, 2016, 19:07:37 /Library/Logs/DiagnosticReports/Kernel_2016-06-20-190737_[redacted].panic [details]

June 20, 2016, 14:10:54 ~/Library/Logs/DiagnosticReports/DocumentPopoverViewService_2016-06-20-141054_ [redacted] .crash

com.apple.appkit.xpc.documentPopoverViewService - /System/Library/Frameworks/AppKit.framework/Versions/C/XPCServices/DocumentPopo verViewService.xpc/Contents/MacOS/DocumentPopoverViewService

June 18, 2016, 18:36:45 ~/Library/Logs/DiagnosticReports/ScreenSaverEngine_2016-06-18-183645_[redacted] .crash

com.apple.ScreenSaver.Engine-

/System/Library/frameworks/screensaver.framework/resources/ScreenSaverEngine.app/happy/MacOS/ScreenSaverEngine

June 11, 2016, 10:21:42 /Library/Logs/DiagnosticReports/Kernel_2016-06-11-102142_[redacted].panic [details]

June 1, 2016, 18:35 /Library/Logs/DiagnosticReports/Kernel_2016-06-01-183500_[redacted].panic [details]

May 30, 2016, 12:47:37 /Library/Logs/DiagnosticReports/Kernel_2016-05-30-124737_[redacted].panic [details]

May 30, 2016, 11:47:25 /Library/Logs/DiagnosticReports/Kernel_2016-05-30-114725_[redacted].panic [details]

May 30, 2016, 10:56:49 /Library/Logs/DiagnosticReports/Kernel_2016-05-30-105649_[redacted].panic [details]

24 may 2016, 12:57:07 /Library/Logs/DiagnosticReports/Kernel_2016-05-24-125707_[redacted].panic [details]

Anonymous UUID: 598DE295-E318-081A-2E9E-96D49E2CFC96

Tue June 21 11:19:57 2016

Panic report *.

panic (cpu 1 0xffffff800a11f98b appellant): "an element of the liberated area has been modified in the kalloc.80 area: expected 0xdeadbeefdeadbeef but found 0xdeadbeefdeadbeed, changed locks 0x2, at offset 16 80 in the element 0xffffff801fd5ac70, cookies 0x3f001161aa28bb38 0x535215919d8230f"@/Library/Caches/com.apple.xbs/Sources/xnu/xnu-3248.50.21/osf mk/kern/zalloc.c:503»

Backtrace (CPU 1), frame: return address

0xffffff81155d3270: 0xffffff800a0dab12

0xffffff81155d32f0: 0xffffff800a11f98b

0xffffff81155d3420: 0xffffff800a5a22de

0xffffff81155d3460: 0xffffff800a2e6c9a

0xffffff81155d34c0: 0xffffff800a4fc244

0xffffff81155d35b0: 0xffffff800a4fcb6d

0xffffff81155d3750: 0xffffff800a4f5a95

0xffffff81155d37e0: 0xffffff800a50fa7d

0xffffff81155d39b0: 0xffffff800a2f2efe

0xffffff81155d3a80: 0xffffff800a2f26a8

0xffffff81155d3bc0: 0xffffff800a305c25

0xffffff81155d3c10: 0xffffff800a313317

0xffffff81155d3f30: 0xffffff800a3087fa

0xffffff81155d3f60: 0xffffff800a6286a1

0xffffff81155d3fb0: 0xffffff800a1ecc66

Corresponding to the current thread BSD process name: Dropbox

Mac OS version:

15F34

Kernel version:

15.5.0 Darwin kernel version: kills Apr 19 18:36:36 PDT 2016; root:XNU-3248.50.21~8/RELEASE_X86_64

Kernel UUID: 7E7B0822-D2DE-3B39-A7A5-77B40A668BC6

Slide kernel: 0x0000000009e00000

Text of core base: 0xffffff800a000000

Text __HIB base: 0xffffff8009f00000

Name of system model: iMac12, 2 (Mac-942B59F58194171B)

Availability of the system in nanoseconds: 58453196182446

last load kext to 420912598308: com.apple.filesystems.msdosfs 1.10 (addr 0xffffff7f8d347000 size 69632)

Finally unloaded kext to 505934818608: com.apple.filesystems.msdosfs 1.10 (addr 0xffffff7f8d347000 size 61440)

kexts responsible:

net.telestream.driver.TelestreamAudio 1.1.1

com.apple.driver.AppleBluetoothMultitouch 90.3

com.apple.driver.AppleHWSensor 1.9.5d0

com.apple.iokit.IOBluetoothSerialManager 4.4.5f3

com.apple.driver.AGPM 110.22.0

com.apple.driver.AudioAUUC 1.70

com Apple.Driver.pmtelemetry 1

com.apple.iokit.IOUserEthernet 1.0.1

com Apple.filesystems.autofs 3.0

com.apple.driver.AppleOSXWatchdog 1

com.apple.driver.AppleMikeyHIDDriver 124

com.apple.driver.AppleMikeyDriver 274,9

com.apple.driver.AppleHDA 274,9

com.apple.driver.AppleUpstreamUserClient 3.6.1

com.apple.kext.AMDFramebuffer 1.4.2

com.apple.driver.AppleIntelHD3000Graphics 10.0.0

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.AMDRadeonX3000 1.4.2

com.apple.driver.AppleBacklight 170.8.9

com.apple.driver.AppleSMCPDRC 1.0.0

com.apple.driver.AppleSMCLMU 208

com.apple.driver.AppleThunderboltIP 3.0.8

com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.4.5f3

com.apple.driver.AppleMCCSControl 1.2.13

com.apple.driver.AppleLPC 3.1

com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0

com.apple.driver.AppleHV 1

com.apple.driver.AppleIntelSlowAdaptiveClocking 4.0.0

com.apple.driver.AppleIntelSNBGraphicsFB 10.0.0

com.apple.kext.AMD6000Controller 1.4.2

com.apple.iokit.SCSITaskUserClient 3.7.7

com.apple.driver.AppleUSBCardReader 3.7.1

com.apple.driver.AppleIRController 327,6

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0

com.apple.BootCache 38

2.8.5 com.apple.iokit.IOAHCIBlockStorage

com.apple.driver.AppleFWOHCI 5.5.4

com.apple.iokit.AppleBCM5701Ethernet 10.2.0

com.apple.driver.AirPort.Atheros40 700.74.5

com.apple.driver.AppleAHCIPort 3.1.8

com.apple.driver.usb.AppleUSBEHCIPCI 1.0.1

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.driver.AppleIntelCPUPowerManagementClient 218.0.0

com Apple.NKE.applicationfirewall 163

com Apple.Security.Quarantine 3

com.apple.security.TMSafetyNet 8

com.apple.driver.AppleIntelCPUPowerManagement 218.0.0

com.apple.driver.IOBluetoothHIDDriver 4.4.5f3

com.apple.driver.AppleMultitouchDriver 304.12

com.apple.driver.AppleHIDTransport 5

com.apple.iokit.IOSerialFamily 11

com.apple.iokit.IOSurface 108.2.1

com Apple.kext.Triggers 1.0

com.apple.driver.DspFuncLib 274,9

com.apple.kext.OSvKernDSPLib 525

com.apple.iokit.IOAcceleratorFamily2 205,10

com.apple.driver.AppleBacklightExpert 1.1.0

com.apple.iokit.IONDRVSupport 2.4.1

com.apple.driver.CoreCaptureResponder 1

com.apple.driver.AppleSMBusPCI 1.0.14d1

com.apple.driver.AppleHDAController 274,9

com.apple.iokit.IOHDAFamily 274,9

com.apple.iokit.IOAudioFamily 204.4

com.apple.vecLib.kext 1.2.0

com.apple.driver.AppleThunderboltEDMSink 4.1.1

com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.4.5f3

com.apple.iokit.IOBluetoothFamily 4.4.5f3

com.apple.driver.AppleSMBusController 1.0.14d1

com.apple.driver.AppleSMC 3.1.9

com.apple.driver.IOPlatformPluginLegacy 1.0.0

com.apple.driver.IOPlatformPluginFamily 6.0.0d7

com.apple.iokit.IOSlowAdaptiveClockingFamily 1.0.0

com.apple.iokit.IOFireWireIP 2.2.6

com.apple.kext.AMDSupport 1.4.2

3.12.8 com.apple.AppleGraphicsDeviceControl

com.apple.iokit.IOGraphicsFamily 2.4.1

com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.7.7

com.apple.iokit.IOBDStorageFamily 1.8

com.apple.iokit.IODVDStorageFamily 1.8

com.apple.iokit.IOCDStorageFamily 1.8

com.apple.iokit.IOAHCISerialATAPI 2.6.2

com.apple.driver.AppleHIDKeyboard 181

com.apple.driver.usb.IOUSBHostHIDDevice 1.0.1

com.apple.iokit.IOSCSIBlockCommandsDevice 3.7.7

com.apple.iokit.IOUSBMassStorageDriver 1.0.0

com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.7

com.apple.iokit.IOUSBHIDDriver 900.4.1

com Apple.Driver.USB.cdc 5.0.0

com.Apple.Driver.USB.Networking 5.0.0

com.apple.driver.usb.AppleUSBHostCompositeDevice 1.0.1

com.apple.driver.usb.AppleUSBHub 1.0.1

com.apple.driver.AppleThunderboltDPInAdapter 4.1.3

com.apple.driver.AppleThunderboltDPOutAdapter 4.1.3

com.apple.driver.AppleThunderboltDPAdapterFamily 4.1.3

com.apple.driver.AppleThunderboltPCIDownAdapter 2.0.2

com.apple.driver.AppleThunderboltNHI 4.0.4

com.apple.iokit.IOThunderboltFamily 6.0.2

4.6.1 com.apple.iokit.IOFireWireFamily

com.apple.iokit.IOEthernetAVBController 1.0.3b3

com.apple.driver.mDNSOffloadUserClient 1.0.1b8

com.apple.iokit.IO80211Family 1110.26

com.apple.iokit.IONetworkingFamily 3.2

com Apple.Driver.corecapture 1.0.4

com.apple.iokit.IOUSBFamily 900.4.1

com.apple.iokit.IOAHCIFamily 2.8.1

com.apple.driver.usb.AppleUSBEHCI 1.0.1

com.apple.iokit.IOUSBHostFamily 1.0.1

com.apple.driver.AppleUSBHostMergeProperties 1.0.1

com.apple.driver.AppleEFINVRAM 2.0

com.apple.iokit.IOHIDFamily 2.0.0

com.apple.driver.AppleEFIRuntime 2.0

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 417,4

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.pthread 1

com Apple.KEC.corecrypto 1.0

com.apple.kec.Libm 1

Model: iMac12, 2, IM121.0047.B23 of BootROM, 4 processors, Intel Core i5, 3.1 GHz, 8 GB, MSC 1.72f2

Graphics card: AMD Radeon HD 6970 M, AMD Radeon HD 6970 M, PCIe, 1024 MB

Memory module: DIMM0/0 BANK, 4 GB DDR3, 1333 MHz, 0x80AD, 0x484D54333531533642465238432D48392020

Memory module: DIMM0/1 BANK, 4 GB DDR3, 1333 MHz, 0x80AD, 0x484D54333531533642465238432D48392020

Airport: spairport_wireless_card_type_airport_extreme (0x168C, 0x9A), Atheros 9380: 4.0.74.0 - P2P

Bluetooth: Version 4.4.5f3 17904, 3 services, 27 aircraft, 1 incoming serial ports

Network service: Wi - Fi, AirPort, en1

Serial ATA Device: ST31000528AS, 1 TB

Serial ATA Device: HL-DT-STDVDRW GA32N

USB device: USB 2.0 Bus

USB device: FaceTime HD camera (built-in)

USB device: Hub

USB device: Keyboard Hub

USB Device: Apple keyboard

USB device: Hub BRCM2046

USB Device: USB Bluetooth host controller

USB device: USB 2.0 Bus

USB device: Hub

USB device: BUP SL Slim

USB Device: IR receiver

USB Device: Card reader

Bus crush: iMac, Apple Inc., 25.1