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Question: Panic report - a freed zone element has been modified

If I understand correctly, the error below is typically caused by a misbehaving driver. Can anyone tell me which one is misbehaving or provide a procedure to diagnose and resolved? Thanks.

Anonymous UUID: C761CE26-3734-056B-6098-9F76D04E0CB0

Sun Feb 4 13:13:38 2018

*** Panic Report ***

panic(cpu 4 caller 0xffffff800b29d6ed): "a freed zone element has been modified in zone kalloc.16: expected 0xc0ffee9ce1a653e1 but found 0, bits changed 0xc0ffee9ce1a653e1, at offset 0 of 16 in element 0xffffff8058162cf0, cookies 0x3f00111cbfb07c00 0x53521385e1ae743"@/BuildRoot/Library/Caches/com.apple.xbs/Sources/xnu/xnu-4570 .41.2/osfmk/kern/zalloc.c:1120

Backtrace (CPU 4), Frame : Return Address

0xffffff922df0b600 : 0xffffff800b24f606

0xffffff922df0b650 : 0xffffff800b37c654

0xffffff922df0b690 : 0xffffff800b36e149

0xffffff922df0b710 : 0xffffff800b201120

0xffffff922df0b730 : 0xffffff800b24f03c

0xffffff922df0b860 : 0xffffff800b24edbc

0xffffff922df0b8c0 : 0xffffff800b29d6ed

0xffffff922df0b920 : 0xffffff800b29cfc0

0xffffff922df0b970 : 0xffffff800b29ba03

0xffffff922df0baa0 : 0xffffff800b25b214

0xffffff922df0bae0 : 0xffffff800b80da3c

0xffffff922df0bb00 : 0xffffff800b80daa2

0xffffff922df0bb20 : 0xffffff800b867e8e

0xffffff922df0bb90 : 0xffffff800b8675c5

0xffffff922df0bc00 : 0xffffff800b866a12

0xffffff922df0bc40 : 0xffffff800b868c70

0xffffff922df0bcc0 : 0xffffff7f8d676cf7

0xffffff922df0bcd0 : 0xffffff800b8bbbb4

0xffffff922df0bd00 : 0xffffff800b32277b

0xffffff922df0bd40 : 0xffffff800b254cc8

0xffffff922df0bd90 : 0xffffff800b231cbd

0xffffff922df0bde0 : 0xffffff800b255467

0xffffff922df0be20 : 0xffffff800b23c976

0xffffff922df0bea0 : 0xffffff800b2456a3

0xffffff922df0bed0 : 0xffffff800b2434e4

0xffffff922df0bef0 : 0xffffff800b35857d

0xffffff922df0bfa0 : 0xffffff800b201926

Kernel Extensions in backtrace:

com.apple.iokit.IOSurface(209.2.2)[AE58720D-7079-388F-AD95-FD2366F98F8D]@0xffff ff7f8d66b000->0xffffff7f8d684fff

BSD process name corresponding to current thread: WindowServer

Mac OS version:


Kernel version:

Darwin Kernel Version 17.4.0: Sun Dec 17 09:19:54 PST 2017; root:xnu-4570.41.2~1/RELEASE_X86_64

Kernel UUID: 18D901F1-4A03-3FF1-AE34-C26B2732F13C

Kernel slide: 0x000000000ae00000

Kernel text base: 0xffffff800b000000

__HIB text base: 0xffffff800af00000

System model name: iMac18,3 (Mac-BE088AF8C5EB4FA2)

System uptime in nanoseconds: 18945796026961

last loaded kext at 17714572223999: com.apple.driver.AppleUSBAudio 311.9 (addr 0xffffff7f9346e000, size 389120)

last unloaded kext at 18907856821266: com.apple.driver.usb.cdc 5.0.0 (addr 0xffffff7f93467000, size 28672)

loaded kexts:

jp.co.roland.RDUSB012FDev 1.5.4

com.apple.driver.AppleBluetoothMultitouch 92

com.apple.driver.AGPM 110.23.30

com.apple.driver.ApplePlatformEnabler 2.7.0d0

com.apple.driver.X86PlatformShim 1.0.0

com.apple.filesystems.autofs 3.0

com.apple.driver.AppleUpstreamUserClient 3.6.4

com.apple.driver.AudioAUUC 1.70

com.apple.kext.AMDFramebuffer 1.6.0

com.apple.driver.AppleHDA 280.12

com.apple.kext.AMDRadeonX4200 1.6.0

com.apple.driver.AppleGraphicsDevicePolicy 3.16.21

com.apple.driver.AppleIntelPCHPMC 2.0.1

com.apple.kext.AMD9520Controller 1.6.0

com.apple.AGDCPluginDisplayMetrics 3.16.2

com.apple.driver.AppleThunderboltIP 3.1.1

com.apple.iokit.BroadcomBluetooth20703USBTransport 6.0.2f2

com.apple.driver.AppleIntelKBLGraphics 10.3.0

com.apple.driver.AppleHV 1

com.apple.iokit.IOUserEthernet 1.0.1

com.apple.iokit.IOBluetoothSerialManager 6.0.2f2

com.apple.driver.pmtelemetry 1

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.driver.AppleIntelKBLGraphicsFramebuffer 10.3.0

com.apple.driver.eficheck 1

com.apple.driver.AppleOSXWatchdog 1

com.apple.driver.AppleSMCLMU 211

com.apple.driver.AppleIntelSlowAdaptiveClocking 4.0.0

com.apple.driver.AppleMCCSControl 1.5.3

com.apple.filesystems.apfs 748.41.3

com.apple.filesystems.hfs.kext 407.30.1

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1

com.apple.BootCache 40

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0

com.apple.driver.AppleSDXC 1.7.6

com.apple.iokit.AppleBCM5701Ethernet 10.3.1

com.apple.driver.AirPort.BrcmNIC 1220.28.1a3

com.apple.driver.AppleAHCIPort 329

com.apple.driver.AppleACPIButtons 6.1

com.apple.driver.AppleRTC 2.0

com.apple.driver.AppleSMBIOS 2.1

com.apple.driver.AppleACPIEC 6.1

com.apple.driver.AppleAPIC 1.7

com.apple.nke.applicationfirewall 183

com.apple.security.TMSafetyNet 8

com.apple.security.quarantine 3

com.apple.IOBufferCopyEngineTest 1

com.apple.driver.IOBluetoothHIDDriver 6.0.2f2

com.apple.driver.AppleMultitouchDriver 1204.13

com.apple.driver.AppleInputDeviceSupport 1201.8

com.apple.kext.triggers 1.0

com.apple.driver.DspFuncLib 280.12

com.apple.kext.OSvKernDSPLib 526

com.apple.driver.AppleGraphicsControl 3.16.21

com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 6.0.2f2

com.apple.iokit.IOBluetoothHostControllerUSBTransport 6.0.2f2

com.apple.iokit.IOBluetoothHostControllerTransport 6.0.2f2

com.apple.kext.AMDSupport 1.6.0

com.apple.driver.AppleSSE 1.0

com.apple.iokit.IOSerialFamily 11

com.apple.iokit.IOBluetoothFamily 6.0.2f2

com.apple.iokit.IOAcceleratorFamily2 376.6

com.apple.iokit.IOSurface 209.2.2

com.apple.driver.AppleHDAController 280.12

com.apple.iokit.IOHDAFamily 280.12

com.apple.driver.AppleSMBusPCI 1.0.14d1

com.apple.driver.X86PlatformPlugin 1.0.0

com.apple.driver.IOPlatformPluginFamily 6.0.0d8

com.apple.AppleGPUWrangler 3.16.2

com.apple.AppleGraphicsDeviceControl 3.16.21

com.apple.iokit.IOSlowAdaptiveClockingFamily 1.0.0

com.apple.iokit.IONDRVSupport 517.22

com.apple.driver.AppleSMBusController 1.0.18d1

com.apple.iokit.IOGraphicsFamily 517.22

com.apple.driver.AppleHIDKeyboard 203

com.apple.driver.usb.AppleUSBHub 1.2

com.apple.iokit.IOAudioFamily 206.5

com.apple.vecLib.kext 1.2.0

com.apple.driver.AppleUSBHostMergeProperties 1.2

com.apple.driver.usb.IOUSBHostHIDDevice 1.2

com.apple.filesystems.hfs.encodings.kext 1

com.apple.driver.usb.networking 5.0.0

com.apple.driver.usb.AppleUSBHostCompositeDevice 1.2

com.apple.driver.AppleThunderboltDPInAdapter 5.0.2

com.apple.driver.AppleThunderboltDPAdapterFamily 5.0.2

com.apple.driver.AppleThunderboltPCIDownAdapter 2.1.3

com.apple.driver.AppleHPM 3.1.3

com.apple.driver.AppleIntelLpssI2CController 3.0.60

com.apple.driver.AppleIntelLpssDmac 3.0.60

com.apple.driver.AppleThunderboltNHI 4.5.6

com.apple.iokit.IOThunderboltFamily 6.6.3

com.apple.iokit.IOEthernetAVBController 1.1.0

com.apple.iokit.IONVMeFamily 2.1.0

com.apple.iokit.IO80211Family 1200.12.2

com.apple.driver.mDNSOffloadUserClient 1.0.1b8

com.apple.driver.corecapture 1.0.4

com.apple.driver.AppleIntelLpssI2C 3.0.60

com.apple.driver.usb.AppleUSBHostPacketFilter 1.0

com.apple.iokit.IOUSBFamily 900.4.1

com.apple.iokit.IOAHCIFamily 288

com.apple.driver.usb.AppleUSBXHCIPCI 1.2

com.apple.driver.usb.AppleUSBXHCI 1.2

com.apple.driver.AppleEFINVRAM 2.1

com.apple.driver.AppleEFIRuntime 2.1

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.iokit.IOBufferCopyEngineFamily 1

com.apple.driver.DiskImages 480.30.2

com.apple.driver.AppleFDEKeyStore 28.30

com.apple.driver.AppleEffaceableStorage 1.0

com.apple.driver.AppleKeyStore 2

com.apple.driver.AppleUSBTDM 439.30.4

com.apple.driver.AppleMobileFileIntegrity 1.0.5

com.apple.iokit.IOUSBMassStorageDriver 140.30.1

com.apple.iokit.IOSCSIBlockCommandsDevice 404.30.2

com.apple.iokit.IOSCSIArchitectureModelFamily 404.30.2

com.apple.iokit.IOStorageFamily 2.1

com.apple.driver.AppleCredentialManager 1.0

com.apple.driver.KernelRelayHost 1

com.apple.iokit.IOUSBHostFamily 1.2

com.apple.driver.usb.AppleUSBCommon 1.0

com.apple.driver.AppleBusPowerController 1.0

com.apple.driver.AppleSEPManager 1.0.1

com.apple.driver.IOSlaveProcessor 1

com.apple.iokit.IOReportFamily 31

com.apple.iokit.IOTimeSyncFamily 650.5

com.apple.iokit.IONetworkingFamily 3.4

com.apple.driver.AppleACPIPlatform 6.1

com.apple.driver.AppleSMCRTC 1.0

com.apple.driver.AppleSMC 3.1.9

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: iMac18,3, BootROM IM183.0153.B00, 4 processors, Intel Core i7, 4.2 GHz, 16 GB, SMC 2.41f1

Graphics: Radeon Pro 580, Radeon Pro 580, PCIe, 8 GB

Memory Module: BANK 0/DIMM0, 8 GB, DDR4, 2400 MHz, 0x802C, 0x3841544631473634485A2D324733423220202020

Memory Module: BANK 1/DIMM0, 8 GB, DDR4, 2400 MHz, 0x802C, 0x3841544631473634485A2D324733423220202020

AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x16F), Broadcom BCM43xx 1.0 (

Bluetooth: Version 6.0.2f2, 3 services, 27 devices, 1 incoming serial ports

Network Service: Wi-Fi, AirPort, en1

USB Device: USB 3.0 Bus

USB Device: USB MIDI Interface

USB Device: Bluetooth USB Host Controller

USB Device: FaceTime HD Camera (Built-in)

USB Device: LPK25


USB Device: Keyboard Hub

USB Device: Apple Keyboard

Thunderbolt Bus: iMac, Apple Inc., 23.1

iMac, macOS High Sierra (10.13.3), mid-2017 iMac i7 Retina 5K 27 inch

Posted on Feb 4, 2018 11:44 AM


Feb 4, 2018 11:53 AM in response to TheNorm62 In response to TheNorm62

Possible Fixes for El Capitan or Later

You should try each, one at a time, then test to see if the problem is fixed before going on to the next.

Be sure to backup your files before proceeding if possible.

  1. Shutdown the computer, wait 30 seconds, restart the computer.
  2. Resetting your Mac’s PRAM and NVRAM
  3. Reset the System Management Controller (SMC)
  4. Start the computer in Safe Mode, then restart normally. This is slower than a standard startup.
  5. Repair the disk by booting from the Recovery HD. Immediately after the chime hold down the Command and R keys until the Utility Menu appears. Choose Disk Utility and click on the Continue button. Select the indented (usually, Macintosh HD) volume entry from the side list. Click on the First Aid button in the toolbar. Wait for the Done button to appear. Quit Disk Utility and return to the Utility Menu. Restart the computer from the Apple Menu.
  6. Create a New User Account Open Users & Groups preferences. Click on the lock icon and enter your Admin password when prompted. On the left under Current User click on the Add [+] button under Login Options. Setup a new Admin user account. Upon completion log out of your current account then log into the new account. If your problems cease, then consider switching to the new account and transferring your files to it - Transferring files from one User Account to another.
  7. Download and install theOS X El Capitan 10.11.6 ComboUpdate or 10.12.6 Combo Update or macOS High Sierra 10.13.2 Combo Update as needed.
  8. Reinstall OS X by booting from the Recovery HD using the Command and R keys. When the Utility Menu appears select Reinstall OS X then click on the Continue button.
  9. Erase and Install OS X Restart the computer. Immediately after the chime hold down the CommandandRkeys until the Apple logo appears. When the Utility Menu appears:
  1. Select Disk Utility from the Utility Menu and click on Continue button.
  2. When Disk Utility loads select the drive (out-dented entry) from the Device list.
  3. Click on the Erase icon in Disk Utility's toolbar. A panel will drop down.
  4. Set the Format type to Mac OS Extended (Journaled.)
  5. Click on the Apply button, then wait for the Done button to activate and click on it.
  6. Quit Disk Utility and return to the Utility Menu.
  7. Select Reinstall OS X and click on the Continue button.

Feb 4, 2018 11:53 AM

Reply Helpful

Feb 4, 2018 1:12 PM in response to Kappy In response to Kappy

Thanks for the quick response Kappy. May I ask what did you see in the Panic Report indicates the need to take these steps? I don't mean any disrespect, but this solution seems generic and heavy handed.

Is it helpful to know that this iMac is new (I have had it for less than a month)? All software and drivers are up-to-date for High Sierra 10.13.3. Also, I have a Roland Quad-Capture, Akai LPK25, HiFing USB to MIDI adapter connected and I am am using the old wired USB keyboard from my old mid-2007 iMac (like the extra keys) and an older Apple bluetooth trackpad.

Feb 4, 2018 1:12 PM

Reply Helpful (2)

Feb 4, 2018 1:44 PM in response to TheNorm62 In response to TheNorm62

It's a troubleshooting protocol that often fixes most upgrade problems with El Capitan and later. Nothing about it is "heavy-handed." What gives you that idea? You posted a panic log and nothing else. Did you think we would somehow mystically know the problem and provide the exact fix? 🙂

Generic - Characteristic of or relating to a class or group of things; not specific. That is what a troubleshooting protocol is - generic because it can relate to lots of possible problems and fixes.

It was quite obvious from the log what peripherals were attached, but not that you had tested the computer after first removing the peripherals and booting into Safe Mode to disable the third-party software. That is a process that helps determine if the problem is confined to the computer or the peripherals and their assorted installed software. You have an 11-year-old piece of hardware connected to a brand new computer. There might be a compatibility issue causing the kernel panic.

I do know what I am doing. It has been my experience that when someone says, "I mean no disrespect," they usually do.

Feb 4, 2018 1:44 PM

Reply Helpful

Feb 4, 2018 2:41 PM in response to Kappy In response to Kappy

Thanks, I suppose. I truly did not mean any disrespect and feel bad now. I did get a useful piece of advice from your reply and will disconnect peripherals (and remove drivers) and stop using the old keyboard and trackpad and if the problem does not reoccur, try the Quad-Capture once more (piece of gear I need the most). If it does turn out to be the Roland device, I will see if I can get support from Roland Backstage.

Feb 4, 2018 2:41 PM

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User profile for user: TheNorm62

Question: Panic report - a freed zone element has been modified