Help with Kernel Panic - Late 2013 27" iMac

Question

Any help would be appreciated.  Thanks geniuses.
Anonymous UUID:       EBE7FF4D-D9DB-8A28-F287-8EFE7C3545C7
Tue Aug 12 15:36:18 2014
panic(cpu 2 caller 0xffffff801c854cd5): "a freed zone element has been modified: expected 0xffffff807bfe80e0 but found 0xfeffff807bfe80e0, bits changed 0x100000000000000, at offset 0 of 32 in zone: kalloc.32"@/SourceCache/xnu/xnu-2422.110.17/osfmk/kern/zalloc.c:461
Backtrace (CPU 2), Frame : Return Address
0xffffff83c7363930 : 0xffffff801c822f79
0xffffff83c73639b0 : 0xffffff801c854cd5
0xffffff83c73639f0 : 0xffffff801c8524ef
0xffffff83c7363a50 : 0xffffff801c851dc9
0xffffff83c7363b50 : 0xffffff801c82aa3f
0xffffff83c7363b80 : 0xffffff801cc4e7dd
0xffffff83c7363bb0 : 0xffffff801cc65767
0xffffff83c7363be0 : 0xffffff801cc63cf3
0xffffff83c7363c30 : 0xffffff801cc65a67
0xffffff83c7363c70 : 0xffffff801cc5268c
0xffffff83c7363cb0 : 0xffffff801cc5268c
0xffffff83c7363cf0 : 0xffffff801cc5dc36
0xffffff83c7363d80 : 0xffffff801cc69d1a
0xffffff83c7363e10 : 0xffffff801c85c650
0xffffff83c7363e50 : 0xffffff801c826bc1
0xffffff83c7363e80 : 0xffffff801c8139c5
0xffffff83c7363ef0 : 0xffffff801c81e013
0xffffff83c7363f70 : 0xffffff801c8c9b8d
0xffffff83c7363fb0 : 0xffffff801c8f3f66
BSD process name corresponding to current thread: kextstat
Mac OS version:
13E28
Kernel version:
Darwin Kernel Version 13.3.0: Tue Jun  3 21:27:35 PDT 2014; root:xnu-2422.110.17~1/RELEASE_X86_64
Kernel UUID: BBFADD17-672B-35A2-9B7F-E4B12213E4B8
Kernel slide:     0x000000001c600000
Kernel text base: 0xffffff801c800000
System model name: iMac14,2 (Mac-27ADBB7B4CEE8E61)
System uptime in nanoseconds: 8713672051648
last loaded kext at 7073076173483: com.apple.driver.AppleIntelMCEReporter 104 (addr 0xffffff7f9ef3a000, size 49152)
last unloaded kext at 7192008846166: com.apple.driver.AppleIntelMCEReporter 104 (addr 0xffffff7f9ef3a000, size 32768)
loaded kexts:
com.apple.filesystems.udf 2.5
com.apple.iokit.SCSITaskUserClient 3.6.6
com.apple.driver.AppleBluetoothMultitouch 80.14
com.apple.driver.AppleHWSensor 1.9.5d0
com.apple.filesystems.autofs 3.0
com.apple.driver.AudioAUUC 1.60
com.apple.iokit.IOBluetoothSerialManager 4.2.6f1
com.apple.driver.AppleMikeyHIDDriver 124
com.apple.driver.AppleMikeyDriver 2.6.3f4
com.apple.driver.AppleHDA 2.6.3f4
com.apple.driver.ApplePlatformEnabler 2.0.9d6
com.apple.driver.AGPM 100.14.28
com.apple.driver.X86PlatformShim 1.0.0
com.apple.driver.AppleUpstreamUserClient 3.5.13
com.apple.iokit.IOUserEthernet 1.0.0d1
com.apple.GeForce 8.2.6
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.2.6f1
com.apple.driver.AppleSMCLMU 2.0.4d1
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.AppleLPC 1.7.0
com.apple.driver.AppleThunderboltIP 1.1.2
com.apple.driver.AppleMCCSControl 1.2.5
com.apple.driver.AppleIntelHD5000Graphics 8.2.8
com.apple.driver.AppleIntelFramebufferAzul 8.2.8
com.apple.driver.Oxford_Semi 3.4.1
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeLZVN 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.BootCache 35
com.apple.driver.AppleUSBHub 683.4.0
com.apple.driver.XsanFilter 404
com.apple.driver.AppleFWOHCI 5.0.2
com.apple.iokit.IOAHCIBlockStorage 2.6.0
com.apple.driver.AppleSDXC 1.5.2
com.apple.iokit.AppleBCM5701Ethernet 3.8.1b2
com.apple.driver.AirPort.Brcm4360 842.21.65
com.apple.driver.AppleAHCIPort 3.0.5
com.apple.driver.AppleUSBXHCI 683.4.0
com.apple.driver.AppleACPIButtons 2.0
com.apple.driver.AppleRTC 2.0
com.apple.driver.AppleHPET 1.8
com.apple.driver.AppleSMBIOS 2.1
com.apple.driver.AppleACPIEC 2.0
com.apple.driver.AppleAPIC 1.7
com.apple.nke.applicationfirewall 153
com.apple.security.quarantine 3
com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.6.6
com.apple.iokit.IOBDStorageFamily 1.7
com.apple.iokit.IODVDStorageFamily 1.7.1
com.apple.iokit.IOCDStorageFamily 1.7.1
com.apple.iokit.IOUSBMassStorageClass 3.6.0
com.apple.driver.AppleBluetoothHIDKeyboard 170.15
com.apple.driver.AppleHIDKeyboard 170.15
com.apple.driver.IOBluetoothHIDDriver 4.2.6f1
com.apple.driver.AppleMultitouchDriver 245.13
com.apple.kext.triggers 1.0
com.apple.iokit.IOSerialFamily 10.0.7
com.apple.driver.DspFuncLib 2.6.3f4
com.apple.vecLib.kext 1.0.0
com.apple.iokit.IOBluetoothFamily 4.2.6f1
com.apple.iokit.IOAcceleratorFamily 98.22
com.apple.nvidia.driver.NVDAGK100Hal 8.2.6
com.apple.nvidia.driver.NVDAResman 8.2.6
com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.2.6f1
com.apple.driver.AppleBacklightExpert 1.0.4
com.apple.driver.AppleUSBAudio 2.9.5f8
com.apple.iokit.IOAudioFamily 1.9.7fc2
com.apple.kext.OSvKernDSPLib 1.14
com.apple.iokit.IOFireWireIP 2.2.6
com.apple.driver.AppleThunderboltEDMSink 2.1.3
com.apple.driver.AppleSMBusController 1.0.12d1
com.apple.driver.X86PlatformPlugin 1.0.0
com.apple.driver.AppleSMC 3.1.8
com.apple.driver.IOPlatformPluginFamily 5.7.1d6
com.apple.driver.AppleHDAController 2.6.3f4
com.apple.iokit.IOHDAFamily 2.6.3f4
com.apple.driver.AppleSMBusPCI 1.0.12d1
com.apple.iokit.IOSurface 91.1
com.apple.iokit.IONDRVSupport 2.4.1
com.apple.AppleGraphicsDeviceControl 3.6.22
com.apple.iokit.IOAcceleratorFamily2 98.22
com.apple.iokit.IOGraphicsFamily 2.4.1
com.apple.iokit.IOUSBHIDDriver 660.4.0
com.apple.driver.AppleUSBMergeNub 650.4.0
com.apple.driver.AppleUSBComposite 656.4.1
com.apple.iokit.IOSCSIBlockCommandsDevice 3.6.6
com.apple.iokit.IOFireWireSerialBusProtocolTransport 2.5.1
com.apple.iokit.IOSCSIArchitectureModelFamily 3.6.6
com.apple.iokit.IOFireWireSBP2 4.2.6
com.apple.driver.AppleThunderboltDPInAdapter 3.1.7
com.apple.driver.AppleThunderboltDPOutAdapter 3.1.7
com.apple.driver.AppleThunderboltDPAdapterFamily 3.1.7
com.apple.driver.AppleThunderboltPCIUpAdapter 1.4.5
com.apple.driver.AppleThunderboltPCIDownAdapter 1.4.5
com.apple.driver.CoreStorage 380
com.apple.iokit.IOUSBUserClient 660.4.2
com.apple.iokit.IOFireWireFamily 4.5.5
com.apple.driver.AppleThunderboltNHI 2.0.1
com.apple.iokit.IOThunderboltFamily 3.3.1
com.apple.iokit.IOEthernetAVBController 1.0.3b4
com.apple.iokit.IO80211Family 640.36
com.apple.driver.mDNSOffloadUserClient 1.0.1b5
com.apple.iokit.IONetworkingFamily 3.2
com.apple.iokit.IOAHCIFamily 2.6.5
com.apple.iokit.IOUSBFamily 683.4.0
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 278.11.1
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 23
com.apple.driver.AppleFDEKeyStore 28.30
com.apple.driver.AppleACPIPlatform 2.0
com.apple.iokit.IOPCIFamily 2.9
com.apple.iokit.IOACPIFamily 1.4
com.apple.kec.corecrypto 1.0
com.apple.kec.pthread 1

Answer 1

That panic was not caused by third-party software. If the problem is recurrent, the possibilities are:
A stale or corrupt kernel cache
A damaged OS X installation
A fault in a peripheral device, if any
Corrupt non-volatile memory (NVRAM)
An internal hardware fault (including incompatible memory)
An obscure bug in OS X
You may already have ruled out some of these.
Rule out #1 by starting up in safe mode and then restarting as usual. Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Post for further instructions.
You can rule out #2 and #3 by reinstalling the OS and testing with non-essential peripherals disconnected and aftermarket expansion cards removed, if applicable. Sometimes a clean reinstallation may solve a problem that isn't solved by reinstalling in place.
Corrupt NVRAM, which rarely causes panics, can be ruled out by resetting it.
If your model has user-replaceable memory, and you've upgraded the memory modules, reinstall the original memory and see whether there's any improvement. Be careful not to touch the gold contacts. Clean them with a mild solvent such as rubbing alcohol. Aftermarket memory must exactly match the technical specifications of the machine.
Apple Diagnostics or the Apple Hardware Test, though generally unreliable, will sometimes detect a fault. A negative test can't be depended on. Run the extended version of the test, if applicable.
In the category of obscure bugs, reports suggest that FileVault may trigger kernel traps under some unknown conditions. Most, though not all, of these reports seem to involve starting up from an aftermarket SSD. If those conditions apply to you, try deactivating FileVault.
Even if FileVault is not active, an aftermarket SSD may be the cause of kernel panics. Check the manufacturer's website for a firmware update.
Connecting more than one display is another reported trigger for OS X bugs.
If the system is not fully up to date, running Software Update might get you a bug fix.
In rare cases, a malformed network packet from a defective router or other network device can cause panics. Such packets could also be sent deliberately by a skillful attacker. This possibility is something to consider if you run a public server that might be the target of such an attack.
Otherwise, make a "Genius" appointment at an Apple Store, or go to another authorized service provider to have the machine tested. You may have to leave it there for several days. There isn't much point in doing this unless you can reproduce the panic, or if you can't, it happens often enough that it's likely to be repeated at the store. Otherwise you may be told that nothing is wrong.
Print the first page of the panic report and bring it with you.