Hey guys, I recently bought a used iMac27 (Mid-2011) and first started it yesterday with a clean installation of Yosemite and afterwards El-Capitan (GM). Now I am facing Kernel Panics and cannot tell what's causing them. It happened twice on Yosemite (had it installed for maybe 3 hours) and several times on El Capitan. Unfortunately there is only one panic log provided by the system: Code: Sun Sep 27 23:07:36 2015 *** Panic Report *** panic(cpu 1 caller 0xffffff802bbd7bfa): Kernel trap at 0xffffff802bb8cb16, type 14=page fault, registers: CR0: 0x000000008001003b, CR2: 0xffffff7f80010028, CR3: 0x0000000358b4d012, CR4: 0x00000000000626e0 RAX: 0xffffff7f80000000, RBX: 0xffffff8039709800, RCX: 0xffffff7f80000028, RDX: 0x0000000000010000 RSP: 0xffffff81a57c3490, RBP: 0xffffff81a57c34c0, RSI: 0x0000000050775d80, RDI: 0xffffff8031592bc8 R8: 0x0000000000000000, R9: 0x0000000000000001, R10: 0x0000000000100000, R11: 0x000000000000000e R12: 0xffffff80512f90f0, R13: 0xffffff8030449000, R14: 0x0000000000084000, R15: 0xffffff8031592bc8 RFL: 0x0000000000010206, RIP: 0xffffff802bb8cb16, CS: 0x0000000000000008, SS: 0x0000000000000000 Fault CR2: 0xffffff7f80010028, Error code: 0x0000000000000000, Fault CPU: 0x1, PL: 1 Backtrace (CPU 1), Frame : Return Address 0xffffff81a57c3120 : 0xffffff802bae6417 0xffffff81a57c31a0 : 0xffffff802bbd7bfa 0xffffff81a57c3380 : 0xffffff802bbf51f3 0xffffff81a57c33a0 : 0xffffff802bb8cb16 0xffffff81a57c34c0 : 0xffffff802bb7f463 0xffffff81a57c3840 : 0xffffff802bfdbdd6 0xffffff81a57c3870 : 0xffffff802bcf3868 0xffffff81a57c3a00 : 0xffffff802bcf039c 0xffffff81a57c3c40 : 0xffffff802bf168e5 0xffffff81a57c3d60 : 0xffffff802bd2eef0 0xffffff81a57c3de0 : 0xffffff802bd23cbd 0xffffff81a57c3e60 : 0xffffff802bfcb017 0xffffff81a57c3f00 : 0xffffff802bfcb262 0xffffff81a57c3f60 : 0xffffff802c02ba71 0xffffff81a57c3fb0 : 0xffffff802bbf59f6 BSD process name corresponding to current thread: iTunes Mac OS version: 15B17c Kernel version: Darwin Kernel Version 15.0.0: Tue Sep 15 12:43:52 PDT 2015; root:xnu-3247.10.9~3/RELEASE_X86_64 Kernel UUID: 1666AE46-5BC8-396A-A099-DF86AD27E35B Kernel slide: 0x000000002b800000 Kernel text base: 0xffffff802ba00000 __HIB text base: 0xffffff802b900000 System model name: iMac12,2 (Mac-942B59F58194171B) System uptime in nanoseconds: 2982487662916 last loaded kext at 1840040691696: com.apple.filesystems.cd9660 1.4.4 (addr 0xffffff7faed9b000, size 36864) loaded kexts: com.apple.filesystems.cd9660 1.4.4 com.apple.filesystems.ntfs 3.13 com.apple.filesystems.msdosfs 1.10 com.apple.filesystems.smbfs 3.0.0 com.apple.driver.AudioAUUC 1.70 com.apple.driver.AppleHWSensor 1.9.5d0 com.apple.driver.AppleBluetoothMultitouch 90.3 com.apple.driver.AppleTyMCEDriver 1.0.2d2 com.apple.driver.AGPM 110.20.21 com.apple.filesystems.autofs 3.0 com.apple.iokit.IOBluetoothSerialManager 4.4.0f4 com.apple.driver.AppleOSXWatchdog 1 com.apple.driver.AppleMikeyHIDDriver 124 com.apple.driver.ApplePolicyControl 3.11.32 com.apple.driver.AppleMikeyDriver 272.50.2 com.apple.driver.AppleHDAHardwareConfigDriver 272.50.2 com.apple.driver.AppleHDA 272.50.2 com.apple.driver.AppleUpstreamUserClient 3.6.1 com.apple.driver.pmtelemetry 1 com.apple.kext.AMDFramebuffer 1.3.6 com.apple.iokit.IOUserEthernet 1.0.1 com.apple.Dont_Steal_Mac_OS_X 7.0.0 com.apple.AMDRadeonX3000 1.3.6 com.apple.driver.AppleIntelHD3000Graphics 10.0.0 com.apple.driver.AppleMuxControl 3.11.32 com.apple.driver.AppleBacklight 170.8.1 com.apple.driver.AppleHV 1 com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.4.0f4 com.apple.driver.AppleFIVRDriver 4.1.0 com.apple.driver.AppleSMCPDRC 1.0.0 com.apple.driver.AppleSMCLMU 208 com.apple.kext.AMD6000Controller 1.3.6 com.apple.driver.AppleMCCSControl 1.2.13 com.apple.driver.AppleLPC 3.1 com.apple.driver.AppleIntelSlowAdaptiveClocking 4.0.0 com.apple.driver.AppleThunderboltIP 3.0.8 com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0 com.apple.driver.AppleIntelSNBGraphicsFB 10.0.0 com.apple.iokit.IOBluetoothUSBDFU 4.4.0f4 com.apple.iokit.SCSITaskUserClient 3.7.7 com.apple.driver.AppleUSBStorageCoexistentDriver 3.7.1 com.apple.driver.AppleUSBCardReader 3.7.1 com.apple.driver.AppleIRController 327.5 com.apple.driver.AppleFileSystemDriver 3.0.1 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.AirPort.Atheros40 700.74.5 com.apple.iokit.AppleBCM5701Ethernet 10.1.11 com.apple.driver.AppleFWOHCI 5.5.2 com.apple.driver.AppleAHCIPort 3.1.5 com.apple.driver.usb.AppleUSBEHCIPCI 1.0.1 com.apple.driver.usb.AppleUSBUHCIPCI 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.AppleBluetoothHIDKeyboard 181 com.apple.driver.AppleHIDKeyboard 181 com.apple.driver.IOBluetoothHIDDriver 4.4.0f4 com.apple.driver.AppleMultitouchDriver 304.9 com.apple.driver.AppleHIDTransport 5 com.apple.kext.triggers 1.0 com.apple.iokit.IOSerialFamily 11 com.apple.driver.DspFuncLib 272.50.2 com.apple.kext.OSvKernDSPLib 525 com.apple.iokit.IOSurface 108.0.1 com.apple.iokit.IOAcceleratorFamily2 203.9.2 com.apple.driver.CoreCaptureResponder 1 com.apple.driver.AppleGraphicsControl 3.11.32 com.apple.driver.AppleBacklightExpert 1.1.0 com.apple.iokit.IOFireWireIP 2.2.6 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 272.50.2 com.apple.iokit.IOHDAFamily 272.50.2 com.apple.iokit.IOAudioFamily 204.1 com.apple.vecLib.kext 1.2.0 com.apple.kext.AMDSupport 1.3.6 com.apple.AppleGraphicsDeviceControl 3.11.32 com.apple.driver.AppleSMBusPCI 1.0.14d1 com.apple.driver.AppleSMBusController 1.0.14d1 com.apple.iokit.IOSlowAdaptiveClockingFamily 1.0.0 com.apple.driver.AppleThunderboltEDMSink 4.1.1 com.apple.driver.AppleSMC 3.1.9 com.apple.driver.IOPlatformPluginLegacy 1.0.0 com.apple.driver.IOPlatformPluginFamily 6.0.0d7 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.usb.IOUSBHostHIDDevice 1.0.1 com.apple.iokit.IOUSBMassStorageClass 4.0.0 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.AppleUSBHostCompositeDevice 1.0.1 com.apple.driver.usb.AppleUSBHub 1.0.1 com.apple.driver.AppleThunderboltDPInAdapter 4.1.2 com.apple.driver.AppleThunderboltDPOutAdapter 4.1.2 com.apple.driver.AppleThunderboltDPAdapterFamily 4.1.2 com.apple.driver.AppleThunderboltPCIDownAdapter 2.0.2 com.apple.driver.AppleXsanScheme 3 com.apple.driver.AppleThunderboltNHI 4.0.1 com.apple.iokit.IOThunderboltFamily 5.0.6 com.apple.iokit.IO80211Family 1100.23 com.apple.driver.corecapture 1.0.4 com.apple.driver.AppleUSBMergeNub 900.4.1 com.apple.iokit.IOEthernetAVBController 1.0.3b3 com.apple.driver.mDNSOffloadUserClient 1.0.1b8 com.apple.iokit.IONetworkingFamily 3.2 com.apple.iokit.IOFireWireFamily 4.5.8 com.apple.iokit.IOAHCIFamily 2.8.0 com.apple.iokit.IOUSBFamily 900.4.1 com.apple.driver.usb.AppleUSBUHCI 1.0.1 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.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 415 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 I then uninstalled Paragon and all its NTFS drivers as they did not seem to be compatible with El Capitan (haven't even installed on Yosemite and still is crashed). I ran Rember overnight and it passed 44 loops without any failures - as well as I can tell (Rember- as well as EtreCheck-Logs are attached). Two hours ago I ran a full Apple Hardware Tests with zero problems reported. Not sure whether this is good or bad news... I just uninstalled the memory sticks that were added by the seller (2x4GB) so that the iMac is currently running the stock 4GB RAM only. I will do a Rember Check again and will see whether there will be a panic again. If the AHT and Rember do not report any memory defects, is it still possible that the RAM causes the kernel panics? I am not sure what do to now. Your help is much appreciated. Thank you very much in advance. Best regards, Martin
The KP report really doesn't show anything definitive except that it crashed while you were running iTunes. I doubt the KPs are being caused by bad memory modules although it is possible. My suggestion is to run the iMac in Safe Mode for awhile to see if it still crashes. Safe Mode does a verify on the hard drive while it eliminates all third party drivers and startup apps. It also kills the sound - so don't worry about that. Restart your iMac while holding down the shift key as soon as you hear the chime (Bong!). It may take awhile to boot up. Let it run that way for a good while to see if it crashes. If it doesn't crash in Safe Mode, then you can assume that the problem may be caused by software. However, if it does crash in Safe Mode, then you may be faced with a hardware defect or error. Your particular model iMac (27" 2011 model) has had problems with the graphics adapter so that may be something to keep in mind.
Thanks for your reply. I am currently running it with 4GB of RAM and it's a pain in the a** to be productive at the speeds but when running in Safe Mode it is even worse. But I will try it. But the fact that I cleanly installed El Capitan (and also Yosemite before) should sort out any Software related issues, shouldn't it? What makes you think that it's not memory related? Might it be the hard drive or is it unlikely too? Is there another way or test for the Graphic Adapter? Thanks. EDIT: Rember ran overnight but it only tested 147MB of RAM as the rest was used by other processes... (4GB) I am running iMac with 4GB and in Safe Mode now. I will see whether it will panic again... EDIT 2: No panic so far. I've read that mixed up RAM modules might cause kernel panics. But does it have to be defect modules or simply incompatible ones (mixed with the stock modules)? I am currently running the iMac with stock RAM in safe mode and put the other modules into my MacBook running Rember right now. I will see whether one of the systems crashes. EDIT 3: Rember has just reported memory failures of the third party modules (2 x 4 GB) I took from the iMac and installed in the Macbook. Code: Block Sequential : setting 1 of 256testing 1 of 256setting 2 of 256testing 2 of 256setting 3 of 256testing 3 of 256setting 4 of 256testing 4 of 256setting 5 of 256testing 5 of 256setting 6 of 256testing 6 of 256setting 7 of 256testing 7 of 256setting 8 of 256testing 8 of 256setting 9 of 256testing 9 of 256setting 10 of 256testing 10 of 256setting 11 of 256testing 11 of 256setting 12 of 256testing 12 of 256setting 13 of 256testing 13 of 256setting 14 of 256testing 14 of 256setting 15 of 256testing 15 of 256setting 16 of 256testing 16 of 256setting 17 of 256testing 17 of 256setting 18 of 256testing 18 of 256setting 19 of 256testing 19 of 256setting 20 of 256testing 20 of 256setting 21 of 256testing 21 of 256setting 22 of 256testing 22 of 256setting 23 of 256testing 23 of 256setting 24 of 256testing 24 of 256setting 25 of 256testing 25 of 256setting 26 of 256testing 26 of 256setting 27 of 256testing 27 of 256setting 28 of 256testing 28 of 256setting 29 of 256testing 29 of 256setting 30 of 256testing 30 of 256setting 31 of 256testing 31 of 256setting 32 of 256testing 32 of 256setting 33 of 256testing 33 of 256setting 34 of 256testing 34 of 256setting 35 of 256testing 35 of 256setting 36 of 256testing 36 of 256setting 37 of 256testing 37 of 256setting 38 of 256testing 38 of 256setting 39 of 256testing 39 of 256setting 40 of 256testing 40 of 256setting 41 of 256testing 41 of 256setting 42 of 256testing 42 of 256setting 43 of 256testing 43 of 256setting 44 of 256testing 44 of 256setting 45 of 256testing 45 of 256setting 46 of 256testing 46 of 256setting 47 of 256testing 47 of 256setting 48 of 256testing 48 of 256setting 49 of 256testing 49 of 256setting 50 of 256testing 50 of 256setting 51 of 256testing 51 of 256setting 52 of 256testing 52 of 256setting 53 of 256testing 53 of 256 FAILURE! Data mismatch at local BUFA address 0x00000001636ae830, BUFB address 0x00000001efef8830 BUFA Data: 0x3434343434343434, BUFB Data: 0x34b4343434343434 Checkerboard : setting 1 of 64 What do you guys think? Although the previous tests (Rember and AHT) were negative, this is still a memory failure? The memory modules I installed on the Macbook are of lower clock speeds than the Macbook supports, but that should not be a problem or should it?
Ok, I ran memtest in Single User Mode on the Macbook and received the same error. I reseated the modules (switched places) and now I am running the test again. The next step would be to test each module separate. I'll keep you posted. Thanks again guys. EDIT: After reseating the modules 2 of 3 test sequences ran without any failures so far. I hope that I am not loosing it again...
Are you sure your MacBook uses the same memory as the iMac? If the speeds are different, it's possible for the modules to fail the test in the MacBook while OK in the iMac. If you have any doubts at all about the iMac memory, just replace it. Prices at Amazon.com are very competitive and Amazon sells Crucial memory.
Well, after reseating the modules in the Macbook memtest ran 9 sequences without any memory failures while in their old positions it failed with the message above. I am currently running the iMac with 4GB of RAM and no panics so far (first at Safe Mode and now in normal mode) and replaced the HDD for a SSD (with OWC thermal sensor). I will have the Crucial RAM replaced and try it again. But now I am not sure what tests to do with the crucial RAM. Or should I just have it replaced? What I could think of is to test the modules one by one. What do you think?
It sounds like you have things going OK for now. I would leave well enough alone until such a time if the KPs start again. It may have even been the HDD that was causing the KPs. The biggest fear with that machine is the GPU getting flaky but so far it looks like yours is alright. BTW, opening up an iMac and replacing the HDD is not exactly an easy job, congrats to you.
Thanks for the kind words. I was well prepared when it comes to the iMac surgery so in the end it was pretty doable. I will use the iMac as it is supposed to be used and try not to think about potentially upcoming panics.